Massive install_deps update.

Unfortunately one issue raising another one, this ended up being a
fairly big update, with:

*Fixes:
** Dependencies between libraries are better handled (would fail
   previously in some cases when the lib was also available as package).
** Dependency of Boost over Python is now taken into account.
** Fix CMake flags to use local own built boost.
** Fix building numpy.

*Changes:
** We now use pip for all python modules (including numpy).
** Added all missing python modules (requests etc.).

*Updates:
**USD: 20.08, Due to build failing with 20.05 (missing include).

1 files changed, 333 insertions, 323 deletions

diff --git a/build_files/build_environment/install_deps.sh b/build_files/build_environment/install_deps.sh
index 6cbba74a6ae..9c898a04d55 100755
--- a/build_files/build_environment/install_deps.sh
+++ b/build_files/build_environment/install_deps.sh
@@ -53,15 +53,15 @@ getopt \
 --long source:,install:,tmp:,info:,threads:,help,show-deps,no-sudo,no-build,no-confirm,\
 with-all,with-opencollada,with-jack,with-embree,with-oidn,with-nanovdb,\
 ver-ocio:,ver-oiio:,ver-llvm:,ver-osl:,ver-osd:,ver-openvdb:,ver-xr-openxr:,\
-force-all,force-python,force-numpy,force-boost,force-tbb,\
+force-all,force-python,force-boost,force-tbb,\
 force-ocio,force-openexr,force-oiio,force-llvm,force-osl,force-osd,force-openvdb,\
 force-ffmpeg,force-opencollada,force-alembic,force-embree,force-oidn,force-usd,\
 force-xr-openxr,\
-build-all,build-python,build-numpy,build-boost,build-tbb,\
+build-all,build-python,build-boost,build-tbb,\
 build-ocio,build-openexr,build-oiio,build-llvm,build-osl,build-osd,build-openvdb,\
 build-ffmpeg,build-opencollada,build-alembic,build-embree,build-oidn,build-usd,\
 build-xr-openxr,\
-skip-python,skip-numpy,skip-boost,skip-tbb,\
+skip-python,skip-boost,skip-tbb,\
 skip-ocio,skip-openexr,skip-oiio,skip-llvm,skip-osl,skip-osd,skip-openvdb,\
 skip-ffmpeg,skip-opencollada,skip-alembic,skip-embree,skip-oidn,skip-usd,\
 skip-xr-openxr \
@@ -188,9 +188,6 @@ ARGUMENTS_INFO="\"COMMAND LINE ARGUMENTS:
     --build-python
         Force the build of Python.
 
-    --build-numpy
-        Force the build of NumPy.
-
     --build-boost
         Force the build of Boost.
 
@@ -255,9 +252,6 @@ ARGUMENTS_INFO="\"COMMAND LINE ARGUMENTS:
     --force-python
         Force the rebuild of Python.
 
-    --force-numpy
-        Force the rebuild of NumPy.
-
     --force-boost
         Force the rebuild of Boost.
 
@@ -315,9 +309,6 @@ ARGUMENTS_INFO="\"COMMAND LINE ARGUMENTS:
     --skip-python
         Unconditionally skip Python installation/building.
 
-    --skip-numpy
-        Unconditionally skip NumPy installation/building.
-
     --skip-boost
         Unconditionally skip Boost installation/building.
 
@@ -389,18 +380,62 @@ PYTHON_VERSION="3.9.1"
 PYTHON_VERSION_SHORT="3.9"
 PYTHON_VERSION_MIN="3.7"
 PYTHON_VERSION_MAX="3.10"
-PYTHON_VERSION_INSTALLED=$PYTHON_VERSION_MIN
+PYTHON_VERSION_INSTALLED=$PYTHON_VERSION_SHORT
 PYTHON_FORCE_BUILD=false
 PYTHON_FORCE_REBUILD=false
 PYTHON_SKIP=false
 
-NUMPY_VERSION="1.19.5"
-NUMPY_VERSION_SHORT="1.19"
-NUMPY_VERSION_MIN="1.8"
-NUMPY_VERSION_MAX="2.0"
-NUMPY_FORCE_BUILD=false
-NUMPY_FORCE_REBUILD=false
-NUMPY_SKIP=false
+# Additional Python modules.
+PYTHON_IDNA_VERSION="2.9"
+PYTHON_IDNA_VERSION_MIN="2.0"
+PYTHON_IDNA_VERSION_MAX="3.0"
+PYTHON_IDNA_NAME="idna"
+
+PYTHON_CHARDET_VERSION="3.0.4"
+PYTHON_CHARDET_VERSION_MIN="3.0"
+PYTHON_CHARDET_VERSION_MAX="5.0"
+PYTHON_CHARDET_NAME="chardet"
+
+PYTHON_URLLIB3_VERSION="1.25.9"
+PYTHON_URLLIB3_VERSION_MIN="1.0"
+PYTHON_URLLIB3_VERSION_MAX="2.0"
+PYTHON_URLLIB3_NAME="urllib3"
+
+PYTHON_CERTIFI_VERSION="2020.4.5.2"
+PYTHON_CERTIFI_VERSION_MIN="2020.0"
+PYTHON_CERTIFI_VERSION_MAX="2021.0"
+PYTHON_CERTIFI_NAME="certifi"
+
+PYTHON_REQUESTS_VERSION="2.23.0"
+PYTHON_REQUESTS_VERSION_MIN="2.0"
+PYTHON_REQUESTS_VERSION_MAX="3.0"
+PYTHON_REQUESTS_NAME="requests"
+
+PYTHON_NUMPY_VERSION="1.19.5"
+PYTHON_NUMPY_VERSION_MIN="1.14"
+PYTHON_NUMPY_VERSION_MAX="2.0"
+PYTHON_NUMPY_NAME="numpy"
+
+# As package-ready parameters (only used with distro packages).
+PYTHON_MODULES_PACKAGES=(
+  "$PYTHON_IDNA_NAME $PYTHON_IDNA_VERSION_MIN $PYTHON_IDNA_VERSION_MAX"
+  "$PYTHON_CHARDET_NAME $PYTHON_CHARDET_VERSION_MIN $PYTHON_CHARDET_VERSION_MAX"
+  "$PYTHON_URLLIB3_NAME $PYTHON_URLLIB3_VERSION_MIN $PYTHON_URLLIB3_VERSION_MAX"
+  "$PYTHON_CERTIFI_NAME $PYTHON_CERTIFI_VERSION_MIN $PYTHON_CERTIFI_VERSION_MAX"
+  "$PYTHON_REQUESTS_NAME $PYTHON_REQUESTS_VERSION_MIN $PYTHON_REQUESTS_VERSION_MAX"
+  "$PYTHON_NUMPY_NAME $PYTHON_NUMPY_VERSION_MIN $PYTHON_NUMPY_VERSION_MAX"
+)
+
+# As pip-ready parameters (only used when building python).
+PYTHON_MODULES_PIP=(
+  "$PYTHON_IDNA_NAME==$PYTHON_IDNA_VERSION"
+  "$PYTHON_CHARDET_NAME==$PYTHON_CHARDET_VERSION"
+  "$PYTHON_URLLIB3_NAME==$PYTHON_URLLIB3_VERSION"
+  "$PYTHON_CERTIFI_NAME==$PYTHON_CERTIFI_VERSION"
+  "$PYTHON_REQUESTS_NAME==$PYTHON_REQUESTS_VERSION"
+  "$PYTHON_NUMPY_NAME==$PYTHON_NUMPY_VERSION"
+)
+
 
 BOOST_VERSION="1.73.0"
 BOOST_VERSION_SHORT="1.73"
@@ -491,10 +526,10 @@ ALEMBIC_FORCE_BUILD=false
 ALEMBIC_FORCE_REBUILD=false
 ALEMBIC_SKIP=false
 
-USD_VERSION="20.05"
-USD_VERSION_SHORT="20.05"
+USD_VERSION="20.08"
+USD_VERSION_SHORT="20.08"
 USD_VERSION_MIN="20.05"
-USD_VERSION_MAX="20.06"
+USD_VERSION_MAX="21.00"
 USD_FORCE_BUILD=false
 USD_FORCE_REBUILD=false
 USD_SKIP=false
@@ -730,7 +765,6 @@ while true; do
     ;;
     --build-all)
       PYTHON_FORCE_BUILD=true
-      NUMPY_FORCE_BUILD=true
       BOOST_FORCE_BUILD=true
       TBB_FORCE_BUILD=true
       OCIO_FORCE_BUILD=true
@@ -751,12 +785,6 @@ while true; do
     ;;
     --build-python)
       PYTHON_FORCE_BUILD=true
-      NUMPY_FORCE_BUILD=true
-      shift; continue
-    ;;
-    --build-numpy)
-      PYTHON_FORCE_BUILD=true
-      NUMPY_FORCE_BUILD=true
       shift; continue
     ;;
     --build-boost)
@@ -809,7 +837,6 @@ while true; do
     ;;
     --force-all)
       PYTHON_FORCE_REBUILD=true
-      NUMPY_FORCE_REBUILD=true
       BOOST_FORCE_REBUILD=true
       TBB_FORCE_REBUILD=true
       OCIO_FORCE_REBUILD=true
@@ -830,12 +857,8 @@ while true; do
     ;;
     --force-python)
       PYTHON_FORCE_REBUILD=true
-      NUMPY_FORCE_REBUILD=true
       shift; continue
     ;;
-    --force-numpy)
-      NUMPY_FORCE_REBUILD=true; shift; continue
-    ;;
     --force-boost)
       BOOST_FORCE_REBUILD=true; shift; continue
     ;;
@@ -887,9 +910,6 @@ while true; do
     --skip-python)
       PYTHON_SKIP=true; shift; continue
     ;;
-    --skip-numpy)
-      NUMPY_SKIP=true; shift; continue
-    ;;
     --skip-boost)
       BOOST_SKIP=true; shift; continue
     ;;
@@ -990,11 +1010,10 @@ PRINT ""
 
 # This has to be done here, because user might force some versions...
 PYTHON_SOURCE=( "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz" )
-NUMPY_SOURCE=( "https://github.com/numpy/numpy/releases/download/v$NUMPY_VERSION/numpy-$NUMPY_VERSION.tar.gz" )
 
 _boost_version_nodots=`echo "$BOOST_VERSION" | sed -r 's/\./_/g'`
 BOOST_SOURCE=( "https://dl.bintray.com/boostorg/release/$BOOST_VERSION/source/boost_$_boost_version_nodots.tar.bz2" )
-BOOST_BUILD_MODULES="--with-system --with-filesystem --with-thread --with-regex --with-locale --with-date_time --with-wave --with-iostreams --with-python --with-program_options"
+BOOST_BUILD_MODULES="--with-system --with-filesystem --with-thread --with-regex --with-locale --with-date_time --with-wave --with-iostreams --with-python --with-program_options --with-serialization --with-atomic"
 
 TBB_SOURCE=( "https://github.com/oneapi-src/oneTBB/archive/$TBB_VERSION$TBB_VERSION_UPDATE.tar.gz" )
 TBB_SOURCE_CMAKE=( "https://raw.githubusercontent.com/wjakob/tbb/master/CMakeLists.txt" )
@@ -1112,19 +1131,24 @@ The following libraries will probably not all be available as packages in your d
 You can force install_deps to build those with '--build-all' or relevant 'build-foo' options, see '--help' message.
 You may also want to build them yourself (optional ones are [between brackets]):
 
-    * Python $PYTHON_VERSION_MIN (from $PYTHON_SOURCE).
-    * [NumPy $NUMPY_VERSION_MIN] (from $NUMPY_SOURCE).
-    * Boost $BOOST_VERSION_MIN (from $BOOST_SOURCE, modules: $BOOST_BUILD_MODULES).
-    * TBB $TBB_VERSION_MIN (from $TBB_SOURCE).
-    * [FFMpeg $FFMPEG_VERSION_MIN (needs libvorbis, libogg, libtheora, libx264, libmp3lame, libxvidcore, libvpx, ...)] (from $FFMPEG_SOURCE).
-    * [OpenColorIO $OCIO_VERSION_MIN] (from $OCIO_SOURCE).
-    * ILMBase $OPENEXR_VERSION_MIN (from $OPENEXR_SOURCE).
-    * OpenEXR $OPENEXR_VERSION_MIN (from $OPENEXR_SOURCE).
-    * OpenImageIO $OIIO_VERSION_MIN (from $OIIO_SOURCE).
-    * [LLVM $LLVM_VERSION_MIN (with clang)] (from $LLVM_SOURCE, and $LLVM_CLANG_SOURCE).
-    * [OpenShadingLanguage $OSL_VERSION_MIN] (from $OSL_SOURCE_REPO, branch $OSL_SOURCE_REPO_BRANCH, commit $OSL_SOURCE_REPO_UID).
-    * [OpenSubDiv $OSD_VERSION_MIN] (from $OSD_SOURCE_REPO, branch $OSD_SOURCE_REPO_BRANCH, commit $OSD_SOURCE_REPO_UID).
-    * [OpenVDB $OPENVDB_VERSION_MIN] (from $OPENVDB_SOURCE), [Blosc $OPENVDB_BLOSC_VERSION] (from $OPENVDB_BLOSC_SOURCE).
+    * Python $PYTHON_VERSION (from $PYTHON_SOURCE).
+    ** [IDNA $PYTHON_IDNA_VERSION] (use pip).
+    ** [Chardet $PYTHON_CHARDET_VERSION] (use pip).
+    ** [Urllib3 $PYTHON_URLLIB3_VERSION] (use pip).
+    ** [Certifi $PYTHON_CERTIFI_VERSION] (use pip).
+    ** [Requests $PYTHON_REQUESTS_VERSION] (use pip).
+    ** [NumPy $PYTHON_NUMPY_VERSION] (use pip).
+    * Boost $BOOST_VERSION (from $BOOST_SOURCE, modules: $BOOST_BUILD_MODULES).
+    * TBB $TBB_VERSION (from $TBB_SOURCE).
+    * [FFMpeg $FFMPEG_VERSION (needs libvorbis, libogg, libtheora, libx264, libmp3lame, libxvidcore, libvpx, ...)] (from $FFMPEG_SOURCE).
+    * [OpenColorIO $OCIO_VERSION] (from $OCIO_SOURCE).
+    * ILMBase $OPENEXR_VERSION (from $OPENEXR_SOURCE).
+    * OpenEXR $OPENEXR_VERSION (from $OPENEXR_SOURCE).
+    * OpenImageIO $OIIO_VERSION (from $OIIO_SOURCE).
+    * [LLVM $LLVM_VERSION (with clang)] (from $LLVM_SOURCE, and $LLVM_CLANG_SOURCE).
+    * [OpenShadingLanguage $OSL_VERSION] (from $OSL_SOURCE_REPO, branch $OSL_SOURCE_REPO_BRANCH, commit $OSL_SOURCE_REPO_UID).
+    * [OpenSubDiv $OSD_VERSION] (from $OSD_SOURCE_REPO, branch $OSD_SOURCE_REPO_BRANCH, commit $OSD_SOURCE_REPO_UID).
+    * [OpenVDB $OPENVDB_VERSION] (from $OPENVDB_SOURCE), [Blosc $OPENVDB_BLOSC_VERSION] (from $OPENVDB_BLOSC_SOURCE).
     * [OpenCollada $OPENCOLLADA_VERSION] (from $OPENCOLLADA_SOURCE).
     * [Embree $EMBREE_VERSION] (from $EMBREE_SOURCE).
     * [OpenImageDenoise $OIDN_VERSION] (from $OIDN_SOURCE).
@@ -1309,18 +1333,22 @@ magic_compile_set() {
 
 # Note: should clean nicely in $INST, but not in $SRC, when we switch to a new version of a lib...
 _clean() {
-  rm -rf `readlink -f $_inst_shortcut`
+  if [ $_inst_shortcut ]; then
+    rm -rf `readlink -f $_inst_shortcut`
+    rm -rf $_inst_shortcut
+  fi
   # Only remove $_src dir when not using git repo (avoids to re-clone the whole repo every time!!!).
   if [ $_git == false ]; then
     rm -rf $_src
   fi
   rm -rf $_inst
-  rm -rf $_inst_shortcut
 }
 
 _create_inst_shortcut() {
-  rm -f $_inst_shortcut
-  ln -s $_inst $_inst_shortcut
+  if [ $_inst_shortcut ]; then
+    rm -f $_inst_shortcut
+    ln -s $_inst $_inst_shortcut
+  fi
 }
 
 # ldconfig
@@ -1350,14 +1378,19 @@ _init_python() {
 }
 
 _update_deps_python() {
-  :
+  if [ "$1" = true ]; then
+    BOOST_FORCE_BUILD=true
+  fi
+  if [ "$2" = true ]; then
+    BOOST_FORCE_REBUILD=true
+  fi
 }
 
 clean_Python() {
-  clean_Numpy
   _init_python
   if [ -d $_inst ]; then
-    _update_deps_python
+    # Force rebuilding the dependencies if needed.
+    _update_deps_python false true
   fi
   _clean
 }
@@ -1369,9 +1402,12 @@ compile_Python() {
   fi
 
   # To be changed each time we make edits that would modify the compiled result!
-  py_magic=1
+  py_magic=3
   _init_python
 
+  # Force having own builds for the dependencies.
+  _update_deps_python true false
+
   # Clean install if needed!
   magic_compile_check python-$PYTHON_VERSION $py_magic
   if [ $? -eq 1 -o "$PYTHON_FORCE_REBUILD" = true ]; then
@@ -1380,10 +1416,9 @@ compile_Python() {
 
   if [ ! -d $_inst ]; then
     INFO "Building Python-$PYTHON_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_python
+    # Force rebuilding the dependencies.
+    _update_deps_python true true
 
     prepare_inst
 
@@ -1413,96 +1448,25 @@ compile_Python() {
 
     magic_compile_set python-$PYTHON_VERSION $py_magic
 
+    PYTHON_VERSION_INSTALLED=$PYTHON_VERSION_SHORT
+
     cd $CWD
     INFO "Done compiling Python-$PYTHON_VERSION!"
-    _is_building=false
   else
     INFO "Own Python-$PYTHON_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-python option."
   fi
 
   run_ldconfig "python-$PYTHON_VERSION_SHORT"
-}
-
-# ----------------------------------------------------------------------------
-# Build Numpy
-
-_init_numpy() {
-  _src=$SRC/numpy-$NUMPY_VERSION
-  _git=false
-  _inst=$INST/numpy-$NUMPY_VERSION
-  _python=$INST/python-$PYTHON_VERSION_SHORT
-  _site=lib/python$PYTHON_VERSION_SHORT/site-packages
-  _inst_shortcut=$_python/$_site/numpy
-}
-
-_update_deps_numpy() {
-  :
-}
 
-clean_Numpy() {
-  _init_numpy
-  if [ -d $_inst ]; then
-    _update_deps_numpy
-  fi
-  _clean
-}
-
-compile_Numpy() {
-  if [ "$NO_BUILD" = true ]; then
-    WARNING "--no-build enabled, Numpy will not be compiled!"
-    return
-  fi
-
-  # To be changed each time we make edits that would modify the compiled result!
-  numpy_magic=0
-  _init_numpy
-
-  # Clean install if needed!
-  magic_compile_check numpy-$NUMPY_VERSION $numpy_magic
-  if [ $? -eq 1 -o "$NUMPY_FORCE_REBUILD" = true ]; then
-    clean_Numpy
-  fi
-
-  if [ ! -d $_inst ]; then
-    INFO "Building Numpy-$NUMPY_VERSION"
-    _is_building=true
-
-    # Rebuild dependencies as well!
-    _update_deps_numpy
-
-    prepare_inst
-
-    if [ ! -d $_src ]; then
-      mkdir -p $SRC
-      download NUMPY_SOURCE[@] $_src.tar.gz
-
-      INFO "Unpacking Numpy-$NUMPY_VERSION"
-      tar -C $SRC -xf $_src.tar.gz
-    fi
-
-    cd $_src
-
-    $_python/bin/python3 setup.py install --old-and-unmanageable --prefix=$_inst
-
-    if [ -d $_inst ]; then
-      # Can't use _create_inst_shortcut here...
-      rm -f $_inst_shortcut
-      ln -s $_inst/$_site/numpy $_inst_shortcut
-    else
-      ERROR "Numpy-$NUMPY_VERSION failed to compile, exiting"
-      exit 1
-    fi
-
-    magic_compile_set numpy-$NUMPY_VERSION $numpy_magic
-
-    cd $CWD
-    INFO "Done compiling Numpy-$NUMPY_VERSION!"
-    _is_building=false
-  else
-    INFO "Own Numpy-$NUMPY_VERSION is up to date, nothing to do!"
-    INFO "If you want to force rebuild of this lib, use the --force-numpy option."
-  fi
+  # Extra step: install required modules with pip.
+  _python="$_inst/bin/python3"
+  $_python -m pip install --upgrade pip
+  for module in "${PYTHON_MODULES_PIP[@]}"
+  do
+    PRINT ""
+    $_python -m pip install $module --no-binary :all:
+  done
 }
 
 # ----------------------------------------------------------------------------
@@ -1516,22 +1480,25 @@ _init_boost() {
 }
 
 _update_deps_boost() {
-  OIIO_FORCE_REBUILD=true
-  OSL_FORCE_REBUILD=true
-  OPENVDB_FORCE_REBUILD=true
-  ALEMBIC_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OIIO_FORCE_BUILD=true
     OSL_FORCE_BUILD=true
     OPENVDB_FORCE_BUILD=true
     ALEMBIC_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OIIO_FORCE_REBUILD=true
+    OSL_FORCE_REBUILD=true
+    OPENVDB_FORCE_REBUILD=true
+    ALEMBIC_FORCE_REBUILD=true
+  fi
 }
 
 clean_Boost() {
   _init_boost
   if [ -d $_inst ]; then
-    _update_deps_boost
+    # Force rebuilding the dependencies if needed.
+    _update_deps_boost false true
   fi
   _clean
 }
@@ -1543,10 +1510,13 @@ compile_Boost() {
   fi
 
   # To be changed each time we make edits that would modify the compiled result!
-  boost_magic=11
+  boost_magic=14
 
   _init_boost
 
+  # Force having own builds for the dependencies.
+  _update_deps_boost true false
+
   # Clean install if needed!
   magic_compile_check boost-$BOOST_VERSION $boost_magic
   if [ $? -eq 1 -o "$BOOST_FORCE_REBUILD" = true ]; then
@@ -1555,10 +1525,9 @@ compile_Boost() {
 
   if [ ! -d $_inst ]; then
     INFO "Building Boost-$BOOST_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_boost
+    # Force rebuilding the dependencies.
+    _update_deps_boost true true
 
     prepare_inst
 
@@ -1571,7 +1540,11 @@ compile_Boost() {
 
     cd $_src
     if [ ! -f $_src/b2 ]; then
-      ./bootstrap.sh
+      if [ -d $INST/python-$PYTHON_VERSION_INSTALLED ]; then
+        ./bootstrap.sh --with-python-root="$INST/python-$PYTHON_VERSION_INSTALLED"
+      else
+        ./bootstrap.sh
+      fi
     fi
     ./b2 -j$THREADS -a $BOOST_BUILD_MODULES \
          --prefix=$_inst --disable-icu boost.locale.icu=off install
@@ -1588,7 +1561,6 @@ compile_Boost() {
 
     cd $CWD
     INFO "Done compiling Boost-$BOOST_VERSION!"
-    _is_building=false
   else
     INFO "Own Boost-$BOOST_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-boost option."
@@ -1609,24 +1581,27 @@ _init_tbb() {
 }
 
 _update_deps_tbb() {
-  OSD_FORCE_REBUILD=true
-  OPENVDB_FORCE_REBUILD=true
-  USD_FORCE_REBUILD=true
-  EMBREE_FORCE_REBUILD=true
-  OIDN_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OSD_FORCE_BUILD=true
     OPENVDB_FORCE_BUILD=true
     USD_FORCE_BUILD=true
     EMBREE_FORCE_BUILD=true
     OIDN_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OSD_FORCE_REBUILD=true
+    OPENVDB_FORCE_REBUILD=true
+    USD_FORCE_REBUILD=true
+    EMBREE_FORCE_REBUILD=true
+    OIDN_FORCE_REBUILD=true
+  fi
 }
 
 clean_TBB() {
   _init_tbb
   if [ -d $_inst ]; then
-    _update_deps_tbb
+    # Force rebuilding the dependencies if needed.
+    _update_deps_tbb false true
   fi
   _clean
 }
@@ -1641,6 +1616,9 @@ compile_TBB() {
   tbb_magic=0
   _init_tbb
 
+  # Force having own builds for the dependencies.
+  _update_deps_tbb true false
+
   # Clean install if needed!
   magic_compile_check tbb-$TBB_VERSION $tbb_magic
   if [ $? -eq 1 -o "$TBB_FORCE_REBUILD" = true ]; then
@@ -1649,10 +1627,9 @@ compile_TBB() {
 
   if [ ! -d $_inst ]; then
     INFO "Building TBB-$TBB_VERSION$TBB_VERSION_UPDATE"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_tbb
+    # Force rebuilding the dependencies.
+    _update_deps_tbb true true
 
     prepare_inst
 
@@ -1713,7 +1690,6 @@ compile_TBB() {
 
     cd $CWD
     INFO "Done compiling TBB-$TBB_VERSION$TBB_VERSION_UPDATE!"
-    _is_building=false
   else
     INFO "Own TBB-$TBB_VERSION$TBB_VERSION_UPDATE is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-tbb option."
@@ -1743,7 +1719,8 @@ _update_deps_ocio() {
 clean_OCIO() {
   _init_ocio
   if [ -d $_inst ]; then
-    _update_deps_ocio
+    # Force rebuilding the dependencies if needed.
+    _update_deps_ocio false true
   fi
   _clean
 }
@@ -1758,6 +1735,9 @@ compile_OCIO() {
   ocio_magic=2
   _init_ocio
 
+  # Force having own builds for the dependencies.
+  _update_deps_ocio true false
+
   # Clean install if needed!
   magic_compile_check ocio-$OCIO_VERSION $ocio_magic
   if [ $? -eq 1 -o "$OCIO_FORCE_REBUILD" = true ]; then
@@ -1766,10 +1746,9 @@ compile_OCIO() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenColorIO-$OCIO_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_ocio
+    # Force rebuilding the dependencies.
+    _update_deps_ocio true true
 
     prepare_inst
 
@@ -1842,7 +1821,6 @@ compile_OCIO() {
 
     cd $CWD
     INFO "Done compiling OpenColorIO-$OCIO_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenColorIO-$OCIO_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-ocio option."
@@ -1862,18 +1840,21 @@ _init_openexr() {
 }
 
 _update_deps_openexr() {
-  OIIO_FORCE_REBUILD=true
-  ALEMBIC_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OIIO_FORCE_BUILD=true
     ALEMBIC_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OIIO_FORCE_REBUILD=true
+    ALEMBIC_FORCE_REBUILD=true
+  fi
 }
 
 clean_OPENEXR() {
   _init_openexr
   if [ -d $_inst ]; then
-    _update_deps_openexr
+    # Force rebuilding the dependencies if needed.
+    _update_deps_openexr false true
   fi
   _clean
 }
@@ -1886,6 +1867,10 @@ compile_OPENEXR() {
 
   # To be changed each time we make edits that would modify the compiled result!
   openexr_magic=15
+  _init_openexr
+
+  # Force having own builds for the dependencies.
+  _update_deps_openexr true false
 
   # Clean install if needed!
   magic_compile_check openexr-$OPENEXR_VERSION $openexr_magic
@@ -1894,14 +1879,12 @@ compile_OPENEXR() {
   fi
 
   PRINT ""
-  _init_openexr
 
   if [ ! -d $_inst ]; then
     INFO "Building ILMBase-$OPENEXR_VERSION and OpenEXR-$OPENEXR_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_openexr
+    # Force rebuilding the dependencies.
+    _update_deps_openexr true true
 
     prepare_inst
 
@@ -1969,7 +1952,6 @@ compile_OPENEXR() {
 
     cd $CWD
     INFO "Done compiling OpenEXR-$OPENEXR_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenEXR-$OPENEXR_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-openexr option."
@@ -1992,16 +1974,19 @@ _init_oiio() {
 }
 
 _update_deps_oiio() {
-  OSL_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OSL_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OSL_FORCE_REBUILD=true
+  fi
 }
 
 clean_OIIO() {
   _init_oiio
   if [ -d $_inst ]; then
-    _update_deps_oiio
+    # Force rebuilding the dependencies if needed.
+    _update_deps_oiio false true
   fi
   _clean
 }
@@ -2016,6 +2001,9 @@ compile_OIIO() {
   oiio_magic=17
   _init_oiio
 
+  # Force having own builds for the dependencies.
+  _update_deps_oiio true false
+
   # Clean install if needed!
   magic_compile_check oiio-$OIIO_VERSION $oiio_magic
   if [ $? -eq 1 -o "$OIIO_FORCE_REBUILD" = true ]; then
@@ -2024,10 +2012,9 @@ compile_OIIO() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenImageIO-$OIIO_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_oiio
+    # Force rebuilding the dependencies.
+    _update_deps_oiio true true
 
     prepare_inst
 
@@ -2091,7 +2078,7 @@ compile_OIIO() {
     #cmake_d="$cmake_d -D CMAKE_VERBOSE_MAKEFILE=ON"
 
     if [ -d $INST/boost ]; then
-      cmake_d="$cmake_d -D BOOST_ROOT=$INST/boost -D Boost_NO_SYSTEM_PATHS=ON"
+      cmake_d="$cmake_d -D BOOST_ROOT=$INST/boost -D Boost_NO_SYSTEM_PATHS=ON -D Boost_NO_BOOST_CMAKE=ON"
     fi
 
     # Looks like we do not need ocio in oiio for now...
@@ -2121,7 +2108,6 @@ compile_OIIO() {
 
     cd $CWD
     INFO "Done compiling OpenImageIO-$OIIO_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenImageIO-$OIIO_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-oiio option."
@@ -2143,16 +2129,19 @@ _init_llvm() {
 }
 
 _update_deps_llvm() {
-  OSL_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OSL_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OSL_FORCE_REBUILD=true
+  fi
 }
 
 clean_LLVM() {
   _init_llvm
   if [ -d $_inst ]; then
-    _update_deps_llvm
+    # Force rebuilding the dependencies if needed.
+    _update_deps_llvm false true
   fi
   _clean
 }
@@ -2167,6 +2156,9 @@ compile_LLVM() {
   llvm_magic=3
   _init_llvm
 
+  # Force having own builds for the dependencies.
+  _update_deps_llvm true false
+
   # Clean install if needed!
   magic_compile_check llvm-$LLVM_VERSION $llvm_magic
   if [ $? -eq 1 -o "$LLVM_FORCE_REBUILD" = true ]; then
@@ -2175,10 +2167,9 @@ compile_LLVM() {
 
   if [ ! -d $_inst ]; then
     INFO "Building LLVM-$LLVM_VERSION (CLANG included!)"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_llvm
+    # Force rebuilding the dependencies.
+    _update_deps_llvm true true
 
     prepare_inst
 
@@ -2237,7 +2228,6 @@ compile_LLVM() {
 
     cd $CWD
     INFO "Done compiling LLVM-$LLVM_VERSION (CLANG included)!"
-    _is_building=false
   else
     INFO "Own LLVM-$LLVM_VERSION (CLANG included) is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-llvm option."
@@ -2261,7 +2251,8 @@ _update_deps_osl() {
 clean_OSL() {
   _init_osl
   if [ -d $_inst ]; then
-    _update_deps_osl
+    # Force rebuilding the dependencies if needed.
+    _update_deps_osl false true
   fi
   _clean
 }
@@ -2276,6 +2267,9 @@ compile_OSL() {
   osl_magic=21
   _init_osl
 
+  # Force having own builds for the dependencies.
+  _update_deps_osl true false
+
   # Clean install if needed!
   magic_compile_check osl-$OSL_VERSION $osl_magic
   if [ $? -eq 1 -o "$OSL_FORCE_REBUILD" = true ]; then
@@ -2285,10 +2279,9 @@ compile_OSL() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenShadingLanguage-$OSL_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_osl
+    # Force rebuilding the dependencies.
+    _update_deps_osl true true
 
     prepare_inst
 
@@ -2348,7 +2341,7 @@ compile_OSL() {
     fi
 
     if [ -d $INST/boost ]; then
-      cmake_d="$cmake_d -D BOOST_ROOT=$INST/boost -D Boost_NO_SYSTEM_PATHS=ON"
+      cmake_d="$cmake_d -D BOOST_ROOT=$INST/boost -D Boost_NO_SYSTEM_PATHS=ON -D Boost_NO_BOOST_CMAKE=ON"
     fi
 
     if [ -d $INST/oiio ]; then
@@ -2385,7 +2378,6 @@ compile_OSL() {
 
     cd $CWD
     INFO "Done compiling OpenShadingLanguage-$OSL_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenShadingLanguage-$OSL_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-osl option."
@@ -2411,7 +2403,8 @@ _update_deps_osd() {
 clean_OSD() {
   _init_osd
   if [ -d $_inst ]; then
-    _update_deps_osd
+    # Force rebuilding the dependencies if needed.
+    _update_deps_osd false true
   fi
   _clean
 }
@@ -2426,6 +2419,9 @@ compile_OSD() {
   osd_magic=2
   _init_osd
 
+  # Force having own builds for the dependencies.
+  _update_deps_osd true false
+
   # Clean install if needed!
   magic_compile_check osd-$OSD_VERSION $osd_magic
   if [ $? -eq 1 -o "$OSD_FORCE_REBUILD" = true ]; then
@@ -2434,10 +2430,9 @@ compile_OSD() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenSubdiv-$OSD_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_osd
+    # Force rebuilding the dependencies.
+    _update_deps_osd true true
 
     prepare_inst
 
@@ -2499,7 +2494,6 @@ compile_OSD() {
 
     cd $CWD
     INFO "Done compiling OpenSubdiv-$OSD_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenSubdiv-$OSD_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-osd option."
@@ -2519,16 +2513,19 @@ _init_blosc() {
 }
 
 _update_deps_blosc() {
-  OPENVDB_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OPENVDB_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OPENVDB_FORCE_REBUILD=true
+  fi
 }
 
 clean_BLOSC() {
   _init_blosc
   if [ -d $_inst ]; then
-    _update_deps_blosc
+    # Force rebuilding the dependencies if needed.
+    _update_deps_blosc false true
   fi
   _clean
 }
@@ -2543,6 +2540,9 @@ compile_BLOSC() {
   blosc_magic=0
   _init_blosc
 
+  # Force having own builds for the dependencies.
+  _update_deps_blosc true false
+
   # Clean install if needed!
   magic_compile_check blosc-$OPENVDB_BLOSC_VERSION $blosc_magic
   if [ $? -eq 1 -o "$OPENVDB_FORCE_REBUILD" = true ]; then
@@ -2552,10 +2552,9 @@ compile_BLOSC() {
 
   if [ ! -d $_inst ]; then
     INFO "Building Blosc-$OPENVDB_BLOSC_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_blosc
+    # Force rebuilding the dependencies.
+    _update_deps_blosc true true
 
     prepare_inst
 
@@ -2597,7 +2596,6 @@ compile_BLOSC() {
     fi
     cd $CWD
     INFO "Done compiling Blosc-$OPENVDB_BLOSC_VERSION!"
-    _is_building=false
   else
     INFO "Own Blosc-$OPENVDB_BLOSC_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib (and openvdb), use the --force-openvdb option."
@@ -2624,7 +2622,8 @@ _update_deps_nanovdb() {
 clean_nanovdb() {
   _init_nanovdb
   if [ -d $_inst ]; then
-    _update_deps_nanovdb
+    # Force rebuilding the dependencies if needed.
+    _update_deps_nanovdb false true
   fi
   _git=true  # Mere trick to prevent clean from removing $_src...
   _clean
@@ -2635,6 +2634,9 @@ install_NanoVDB() {
   nanovdb_magic=1
   _init_nanovdb
 
+  # Force having own builds for the dependencies.
+  _update_deps_nanovdb true false
+
   # Clean install if needed!
   magic_compile_check nanovdb-$OPENVDB_VERSION $nanovdb_magic
   if [ $? -eq 1 ]; then
@@ -2643,10 +2645,9 @@ install_NanoVDB() {
 
   if [ ! -d $_inst ]; then
     INFO "Installing NanoVDB v$OPENVDB_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_nanovdb
+    # Force rebuilding the dependencies.
+    _update_deps_nanovdb true true
 
     prepare_inst
 
@@ -2703,7 +2704,6 @@ install_NanoVDB() {
 
     cd $CWD
     INFO "Done compiling NanoVDB-v$OPENVDB_VERSION!"
-    _is_building=false
   else
     INFO "Own NanoVDB-v$OPENVDB_VERSION is up to date, nothing to do!"
   fi
@@ -2729,7 +2729,8 @@ _update_deps_openvdb() {
 clean_OPENVDB() {
   _init_openvdb
   if [ -d $_inst ]; then
-    _update_deps_openvdb
+    # Force rebuilding the dependencies if needed.
+    _update_deps_openvdb false true
   fi
   _clean
 }
@@ -2747,6 +2748,9 @@ compile_OPENVDB() {
   openvdb_magic=2
   _init_openvdb
 
+  # Force having own builds for the dependencies.
+  _update_deps_openvdb true false
+
   # Clean install if needed!
   magic_compile_check openvdb-$OPENVDB_VERSION $openvdb_magic
   if [ $? -eq 1 -o "$OPENVDB_FORCE_REBUILD" = true ]; then
@@ -2755,10 +2759,9 @@ compile_OPENVDB() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenVDB-$OPENVDB_VERSION (with NanoVDB: $WITH_NANOVDB)"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_openvdb
+    # Force rebuilding the dependencies.
+    _update_deps_openvdb true true
 
     prepare_inst
 
@@ -2803,6 +2806,7 @@ compile_OPENVDB() {
       cmake_d="$cmake_d -D Boost_USE_MULTITHREADED=ON"
       cmake_d="$cmake_d -D Boost_NO_SYSTEM_PATHS=ON"
       cmake_d="$cmake_d -D Boost_NO_BOOST_CMAKE=ON"
+      cmake_d="$cmake_d -D Boost_NO_BOOST_CMAKE=ON"
     fi
     if [ -d $INST/tbb ]; then
       cmake_d="$cmake_d -D TBB_ROOT=$INST/tbb"
@@ -2833,7 +2837,6 @@ compile_OPENVDB() {
 
     cd $CWD
     INFO "Done compiling OpenVDB-$OPENVDB_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenVDB-$OPENVDB_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-openvdb option."
@@ -2863,7 +2866,8 @@ _update_deps_alembic() {
 clean_ALEMBIC() {
   _init_alembic
   if [ -d $_inst ]; then
-    _update_deps_alembic
+    # Force rebuilding the dependencies if needed.
+    _update_deps_alembic false true
   fi
   _clean
 }
@@ -2878,6 +2882,9 @@ compile_ALEMBIC() {
   alembic_magic=2
   _init_alembic
 
+  # Force having own builds for the dependencies.
+  _update_deps_alembic true false
+
   # Clean install if needed!
   magic_compile_check alembic-$ALEMBIC_VERSION $alembic_magic
   if [ $? -eq 1 -o "$ALEMBIC_FORCE_REBUILD" = true ]; then
@@ -2886,10 +2893,9 @@ compile_ALEMBIC() {
 
   if [ ! -d $_inst ]; then
     INFO "Building Alembic-$ALEMBIC_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_alembic
+    # Force rebuilding the dependencies.
+    _update_deps_alembic true true
 
     prepare_inst
 
@@ -2944,7 +2950,6 @@ compile_ALEMBIC() {
 
     cd $CWD
     INFO "Done compiling Alembic-$ALEMBIC_VERSION!"
-    _is_building=false
   else
     INFO "Own Alembic-$ALEMBIC_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-alembic option."
@@ -2968,7 +2973,8 @@ _update_deps_usd() {
 clean_USD() {
   _init_usd
   if [ -d $_inst ]; then
-    _update_deps_usd
+    # Force rebuilding the dependencies if needed.
+    _update_deps_usd false true
   fi
   _clean
 }
@@ -2983,6 +2989,9 @@ compile_USD() {
   usd_magic=1
   _init_usd
 
+  # Force having own builds for the dependencies.
+  _update_deps_usd true false
+
   # Clean install if needed!
   magic_compile_check usd-$USD_VERSION $usd_magic
   if [ $? -eq 1 -o "$USD_FORCE_REBUILD" = true ]; then
@@ -2991,10 +3000,9 @@ compile_USD() {
 
   if [ ! -d $_inst ]; then
     INFO "Building USD-$USD_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_usd
+    # Force rebuilding the dependencies.
+    _update_deps_usd true true
 
     prepare_inst
 
@@ -3042,7 +3050,6 @@ compile_USD() {
 
     cd $CWD
     INFO "Done compiling USD-$USD_VERSION!"
-    _is_building=false
   else
     INFO "Own USD-$USD_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-usd option."
@@ -3067,7 +3074,8 @@ _update_deps_collada() {
 clean_OpenCOLLADA() {
   _init_opencollada
   if [ -d $_inst ]; then
-    _update_deps_collada
+    # Force rebuilding the dependencies if needed.
+    _update_deps_collada false true
   fi
   _clean
 }
@@ -3082,6 +3090,9 @@ compile_OpenCOLLADA() {
   opencollada_magic=9
   _init_opencollada
 
+  # Force having own builds for the dependencies.
+  _update_deps_opencollada true false
+
   # Clean install if needed!
   magic_compile_check opencollada-$OPENCOLLADA_VERSION $opencollada_magic
   if [ $? -eq 1 -o "$OPENCOLLADA_FORCE_REBUILD" = true ]; then
@@ -3090,10 +3101,9 @@ compile_OpenCOLLADA() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenCOLLADA-$OPENCOLLADA_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_collada
+    # Force rebuilding the dependencies.
+    _update_deps_collada true true
 
     prepare_inst
 
@@ -3149,7 +3159,6 @@ compile_OpenCOLLADA() {
 
     cd $CWD
     INFO "Done compiling OpenCOLLADA-$OPENCOLLADA_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenCOLLADA-$OPENCOLLADA_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-opencollada option."
@@ -3173,7 +3182,8 @@ _update_deps_embree() {
 clean_Embree() {
   _init_embree
   if [ -d $_inst ]; then
-    _update_deps_embree
+    # Force rebuilding the dependencies if needed.
+    _update_deps_embree false true
   fi
   _clean
 }
@@ -3188,6 +3198,9 @@ compile_Embree() {
   embree_magic=10
   _init_embree
 
+  # Force having own builds for the dependencies.
+  _update_deps_embree true false
+
   # Clean install if needed!
   magic_compile_check embree-$EMBREE_VERSION $embree_magic
   if [ $? -eq 1 -o "$EMBREE_FORCE_REBUILD" = true ]; then
@@ -3196,10 +3209,9 @@ compile_Embree() {
 
   if [ ! -d $_inst ]; then
     INFO "Building Embree-$EMBREE_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_embree
+    # Force rebuilding the dependencies.
+    _update_deps_embree true true
 
     prepare_inst
 
@@ -3262,7 +3274,6 @@ compile_Embree() {
 
     cd $CWD
     INFO "Done compiling Embree-$EMBREE_VERSION!"
-    _is_building=false
   else
     INFO "Own Embree-$EMBREE_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-embree option."
@@ -3279,16 +3290,19 @@ _init_ispc() {
 }
 
 _update_deps_ispc() {
-  OIDN_FORCE_REBUILD=true
-  if [ "$_is_building" = true ]; then
+  if [ "$1" = true ]; then
     OIDN_FORCE_BUILD=true
   fi
+  if [ "$2" = true ]; then
+    OIDN_FORCE_REBUILD=true
+  fi
 }
 
 clean_ispc() {
   _init_ispc
   if [ -d $_inst ]; then
-    _update_deps_ispc
+    # Force rebuilding the dependencies if needed.
+    _update_deps_ispc false true
   fi
   _clean
 }
@@ -3298,6 +3312,9 @@ install_ISPC() {
   ispc_magic=0
   _init_ispc
 
+  # Force having own builds for the dependencies.
+  _update_deps_ispc true false
+
   # Clean install if needed!
   magic_compile_check ispc-$ISPC_VERSION $ispc_magic
   if [ $? -eq 1 ]; then
@@ -3306,10 +3323,9 @@ install_ISPC() {
 
   if [ ! -d $_inst ]; then
     INFO "Installing Implicit SPMD Program Compiler v$ISPC_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_ispc
+    # Force rebuilding the dependencies.
+    _update_deps_ispc true true
 
     prepare_inst
 
@@ -3335,7 +3351,6 @@ install_ISPC() {
 
     cd $CWD
     INFO "Done compiling ISPC-v$ISPC_VERSION!"
-    _is_building=false
   else
     INFO "Own ISPC-v$ISPC_VERSION is up to date, nothing to do!"
   fi
@@ -3359,7 +3374,8 @@ _update_deps_oidn() {
 clean_oidn() {
   _init_oidn
   if [ -d $_inst ]; then
-    _update_deps_oidn
+    # Force rebuilding the dependencies if needed.
+    _update_deps_oidn false true
   fi
   _clean
 }
@@ -3377,6 +3393,9 @@ compile_OIDN() {
   oidn_magic=9
   _init_oidn
 
+  # Force having own builds for the dependencies.
+  _update_deps_oidn true false
+
   # Clean install if needed!
   magic_compile_check oidn-$OIDN_VERSION $oidn_magic
   if [ $? -eq 1 -o "$OIDN_FORCE_REBUILD" = true ]; then
@@ -3385,10 +3404,9 @@ compile_OIDN() {
 
   if [ ! -d $_inst ]; then
     INFO "Building OpenImageDenoise-$OIDN_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_oidn
+    # Force rebuilding the dependencies.
+    _update_deps_oidn true true
 
     prepare_inst
 
@@ -3447,7 +3465,6 @@ compile_OIDN() {
 
     cd $CWD
     INFO "Done compiling OpenImageDenoise-$OIDN_VERSION!"
-    _is_building=false
   else
     INFO "Own OpenImageDenoise-$OIDN_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-oidn option."
@@ -3472,7 +3489,8 @@ _update_deps_ffmpeg() {
 clean_FFmpeg() {
   _init_ffmpeg
   if [ -d $_inst ]; then
-    _update_deps_ffmpeg
+    # Force rebuilding the dependencies if needed.
+    _update_deps_ffmpeg false true
   fi
   _clean
 }
@@ -3487,6 +3505,9 @@ compile_FFmpeg() {
   ffmpeg_magic=5
   _init_ffmpeg
 
+  # Force having own builds for the dependencies.
+  _update_deps_ffmpeg true false
+
   # Clean install if needed!
   magic_compile_check ffmpeg-$FFMPEG_VERSION $ffmpeg_magic
   if [ $? -eq 1 -o "$FFMPEG_FORCE_REBUILD" = true ]; then
@@ -3495,10 +3516,9 @@ compile_FFmpeg() {
 
   if [ ! -d $_inst ]; then
     INFO "Building ffmpeg-$FFMPEG_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_ffmpeg
+    # Force rebuilding the dependencies.
+    _update_deps_ffmpeg true true
 
     prepare_inst
 
@@ -3577,7 +3597,6 @@ compile_FFmpeg() {
 
     cd $CWD
     INFO "Done compiling ffmpeg-$FFMPEG_VERSION!"
-    _is_building=false
   else
     INFO "Own ffmpeg-$FFMPEG_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-ffmpeg option."
@@ -3601,7 +3620,8 @@ _update_deps_xr_openxr_sdk() {
 clean_XR_OpenXR_SDK() {
   _init_xr_openxr_sdk
   if [ -d $_inst ]; then
-    _update_deps_xr_openxr_sdk
+    # Force rebuilding the dependencies if needed.
+    _update_deps_xr_openxr_sdk false true
   fi
   _clean
 }
@@ -3616,6 +3636,9 @@ compile_XR_OpenXR_SDK() {
   xr_openxr_magic=2
   _init_xr_openxr_sdk
 
+  # Force having own builds for the dependencies.
+  _update_deps_xr_openxr_sdk true false
+
   # Clean install if needed!
   magic_compile_check xr-openxr-$XR_OPENXR_VERSION $xr_openxr_magic
   if [ $? -eq 1 -o "$XR_OPENXR_FORCE_REBUILD" = true ]; then
@@ -3624,10 +3647,9 @@ compile_XR_OpenXR_SDK() {
 
   if [ ! -d $_inst ]; then
     INFO "Building XR-OpenXR-SDK-$XR_OPENXR_VERSION"
-    _is_building=true
 
-    # Rebuild dependencies as well!
-    _update_deps_xr_openxr_sdk
+    # Force rebuilding the dependencies.
+    _update_deps_xr_openxr_sdk true true
 
     prepare_inst
 
@@ -3688,7 +3710,6 @@ compile_XR_OpenXR_SDK() {
 
     cd $CWD
     INFO "Done compiling XR-OpenXR-SDK-$XR_OPENXR_VERSION!"
-    _is_building=false
   else
     INFO "Own XR-OpenXR-SDK-$XR_OPENXR_VERSION is up to date, nothing to do!"
     INFO "If you want to force rebuild of this lib, use the --force-xr-openxr option."
@@ -3950,9 +3971,9 @@ install_DEB() {
   PRINT ""
   _do_compile_python=false
   if [ "$PYTHON_SKIP" = true ]; then
-    WARNING "Skipping Python/NumPy installation, as requested..."
+    WARNING "Skipping Python installation, as requested..."
   elif [ "$PYTHON_FORCE_BUILD" = true ]; then
-    INFO "Forced Python/NumPy building, as requested..."
+    INFO "Forced Python building, as requested..."
     _do_compile_python=true
   else
     check_package_version_ge_lt_DEB python3-dev $PYTHON_VERSION_MIN $PYTHON_VERSION_MAX
@@ -3962,17 +3983,21 @@ install_DEB() {
       install_packages_DEB python3-dev
       clean_Python
       PRINT ""
-      if [ "$NUMPY_SKIP" = true ]; then
-        WARNING "Skipping NumPy installation, as requested..."
-      else
-        check_package_DEB python3-numpy
+
+      for module in "${PYTHON_MODULES_PACKAGES[@]}"
+      do
+        module=($module)
+        package="python3-${module[0]}"
+        package_vmin=${module[1]}
+        package_vmax=${module[2]}
+        check_package_version_ge_lt_DEB "$package" $package_vmin $package_vmax
         if [ $? -eq 0 ]; then
-          install_packages_DEB python3-numpy
+          install_packages_DEB "$package"
         else
-          WARNING "Sorry, using python package but no valid numpy package available!" \
-                  "    Use --build-numpy to force building of both Python and NumPy."
+          WARNING "Sorry, using python package but no valid $package package available!" \
+                  "    Use --build-python to force building of Python and use pip to get the packages."
         fi
-      fi
+      done
     else
       _do_compile_python=true
     fi
@@ -3981,12 +4006,6 @@ install_DEB() {
   if $_do_compile_python; then
     install_packages_DEB libffi-dev
     compile_Python
-    PRINT ""
-    if [ "$NUMPY_SKIP" = true ]; then
-      WARNING "Skipping NumPy installation, as requested..."
-    else
-      compile_Numpy
-    fi
   fi
 
 
@@ -4586,7 +4605,7 @@ install_RPM() {
   if [ "$PYTHON_SKIP" = true ]; then
     WARNING "Skipping Python installation, as requested..."
   elif [ "$PYTHON_FORCE_BUILD" = true ]; then
-    INFO "Forced Python/NumPy building, as requested..."
+    INFO "Forced Python building, as requested..."
     _do_compile_python=true
   else
     check_package_version_ge_lt_RPM python3-devel $PYTHON_VERSION_MIN $PYTHON_VERSION_MAX
@@ -4595,18 +4614,21 @@ install_RPM() {
 
       install_packages_RPM python3-devel
       clean_Python
-      PRINT ""
-      if [ "$NUMPY_SKIP" = true ]; then
-        WARNING "Skipping NumPy installation, as requested..."
-      else
-        check_package_version_ge_lt_RPM python3-numpy $NUMPY_VERSION_MIN $NUMPY_VERSION_MAX
+
+      for module in "${PYTHON_MODULES_PACKAGES[@]}"
+      do
+        module=($module)
+        package="python3-${module[0]}"
+        package_vmin=${module[1]}
+        package_vmax=${module[2]}
+        check_package_version_ge_lt_RPM "$package" $package_vmin $package_vmax
         if [ $? -eq 0 ]; then
-          install_packages_RPM python3-numpy
+          install_packages_RPM "$package"
         else
-          WARNING "Sorry, using python package but no valid numpy package available!" \
-                  "    Use --build-numpy to force building of both Python and NumPy."
+          WARNING "Sorry, using python package but no valid $package package available!" \
+                  "    Use --build-python to force building of Python and use pip to get the packages."
         fi
-      fi
+      done
     else
       _do_compile_python=true
     fi
@@ -4615,12 +4637,6 @@ install_RPM() {
   if [ "$_do_compile_python" = true ]; then
     install_packages_RPM libffi-devel
     compile_Python
-    PRINT ""
-    if [ "$NUMPY_SKIP" = true ]; then
-      WARNING "Skipping NumPy installation, as requested..."
-    else
-      compile_Numpy
-    fi
   fi
 
 
@@ -5127,7 +5143,7 @@ install_ARCH() {
   if [ "$PYTHON_SKIP" = true ]; then
     WARNING "Skipping Python installation, as requested..."
   elif [ "$PYTHON_FORCE_BUILD" = true ]; then
-    INFO "Forced Python/NumPy building, as requested..."
+    INFO "Forced Python building, as requested..."
     _do_compile_python=true
   else
     check_package_version_ge_lt_ARCH python $PYTHON_VERSION_MIN $PYTHON_VERSION_MAX
@@ -5137,17 +5153,21 @@ install_ARCH() {
       install_packages_ARCH python
       clean_Python
       PRINT ""
-      if [ "$NUMPY_SKIP" = true ]; then
-        WARNING "Skipping NumPy installation, as requested..."
-      else
-        check_package_version_ge_ARCH python-numpy $NUMPY_VERSION_MIN $NUMPY_VERSION_MAX
+
+      for module in "${PYTHON_MODULES_PACKAGES[@]}"
+      do
+        module=($module)
+        package="python-${module[0]}"
+        package_vmin=${module[1]}
+        package_vmax=${module[2]}
+        check_package_version_ge_lt_ARCH "$package" $package_vmin $package_vmax
         if [ $? -eq 0 ]; then
-          install_packages_ARCH python-numpy
+          install_packages_ARCH "$package"
         else
-          WARNING "Sorry, using python package but no valid numpy package available!" \
-                  "Use --build-numpy to force building of both Python and NumPy."
+          WARNING "Sorry, using python package but no valid $package package available!" \
+                  "    Use --build-python to force building of Python and use pip to get the packages."
         fi
-      fi
+      done
     else
       _do_compile_python=true
     fi
@@ -5156,12 +5176,6 @@ install_ARCH() {
   if [ "$_do_compile_python" = true ]; then
     install_packages_ARCH libffi
     compile_Python
-    PRINT ""
-    if [ "$NUMPY_SKIP" = true ]; then
-      WARNING "Skipping NumPy installation, as requested..."
-    else
-      compile_Numpy
-    fi
   fi
 
 
@@ -5494,16 +5508,10 @@ install_OTHER() {
 
   PRINT ""
   if [ "$PYTHON_SKIP" = true ]; then
-    WARNING "Skipping Python/NumPy installation, as requested..."
+    WARNING "Skipping Python installation, as requested..."
   elif [ "$PYTHON_FORCE_BUILD" = true ]; then
-    INFO "Forced Python/NumPy building, as requested..."
+    INFO "Forced Python building, as requested..."
     compile_Python
-    PRINT ""
-    if [ "$NUMPY_SKIP" = true ]; then
-      WARNING "Skipping NumPy installation, as requested..."
-    else
-      compile_Numpy
-    fi
   fi
 
 
@@ -5737,9 +5745,11 @@ print_info() {
   if [ -d $INST/boost ]; then
     _1="-D BOOST_ROOT=$INST/boost"
     _2="-D Boost_NO_SYSTEM_PATHS=ON"
+    _3="-D Boost_NO_BOOST_CMAKE=ON"
     PRINT "  $_1"
     PRINT "  $_2"
-    _buildargs="$_buildargs $_1 $_2"
+    PRINT "  $_3"
+    _buildargs="$_buildargs $_1 $_2 $_3"
   fi
 
   if [ -d $INST/tbb ]; then