install_deps.sh: add option to force building libs instead of using packages, and limited fallback for unsuported distro.

This commit adds '--build-foo' options to force the script to build relevant libraries
instead of trying to use packages from the distribution.

In addition, it also now offers (with those '--build-foo' options) the possibility
to build libraries on distributions that are not fully supported.

This is limited, but should still help people once they have installed themselves
the basics of dependencies - boost, llvm, osl/osd etc. are not libraries that are
really easy to build.

DISCLAIMER: I did not take the 20 (or more) hours needed to test all combinations
over all distributions, and given the size of the changes, bad sneaky typos are quite
probable, so please report if you get some errors!

1 files changed, 562 insertions, 124 deletions

diff --git a/build_files/build_environment/install_deps.sh b/build_files/build_environment/install_deps.sh
index 02c5116113a..ade7d1e3559 100755
--- a/build_files/build_environment/install_deps.sh
+++ b/build_files/build_environment/install_deps.sh
@@ -29,9 +29,10 @@ getopt \
 ver-ocio:,ver-oiio:,ver-llvm:,ver-osl:,\
 force-all,force-python,force-numpy,force-boost,force-ocio,force-openexr,force-oiio,force-llvm,force-osl,force-osd,\
 force-ffmpeg,force-opencollada,\
+build-all,build-python,build-numpy,build-boost,build-ocio,build-openexr,build-oiio,build-llvm,build-osl,build-osd,\
+build-ffmpeg,build-opencollada,\
 skip-python,skip-numpy,skip-boost,skip-ocio,skip-openexr,skip-oiio,skip-llvm,skip-osl,skip-osd,\
-skip-ffmpeg,skip-opencollada,\
-required-numpy: \
+skip-ffmpeg,skip-opencollada\
 -- "$@" \
 )
 
@@ -118,6 +119,52 @@ ARGUMENTS_INFO="\"COMMAND LINE ARGUMENTS:
         It may not always work as expected (some libs are actually checked out from a git rev...), yet it might help
         to fix some build issues (like LLVM mismatch with the version used by your graphic system).
 
+    --build-all
+        Force the build of all possible libraries.
+
+    --build-python
+        Force the build of Python.
+
+    --build-numpy
+        Force the build of NumPy.
+
+    --build-boost
+        Force the build of Boost.
+
+    --build-ocio
+        Force the build of OpenColorIO.
+
+    --build-openexr
+        Force the build of OpenEXR.
+
+    --build-oiio
+        Force the build of OpenImageIO.
+
+    --build-llvm
+        Force the build of LLVM.
+
+    --build-osl
+        Force the build of OpenShadingLanguage.
+
+    --build-osd
+        Force the build of OpenSubdiv.
+
+    --build-opencollada
+        Force the build of OpenCOLLADA.
+
+    --build-ffmpeg
+        Force the build of FFMpeg.
+
+    Note about the --build-foo options:
+        * They force the script to prefer building dependencies rather than using available packages.
+          This may make things simpler and allow working around some distribution bugs, but on the other hand it will
+          use much more space on your hard drive.
+        * Please be careful with the Blender building options if you have both 'official' dev packages and
+          install_deps' built ones on your system, by default CMake will prefer official packages, which may lead to
+          linking issues. Please ensure your CMake configuration always uses all correct library paths.
+        * If the “force-built” library is a dependency of others, it will force the build
+          of those libraries as well (e.g. --build-boost also implies --build-oiio and --build-osl...).
+
     --force-all
         Force the rebuild of all built libraries.
 
@@ -191,11 +238,7 @@ ARGUMENTS_INFO="\"COMMAND LINE ARGUMENTS:
         Unconditionally skip OpenCOLLADA installation/building.
 
     --skip-ffmpeg
-        Unconditionally skip FFMpeg installation/building.
-
-    --required-numpy
-        Use this in case your distro features a valid python package, but no matching Numpy one.
-        It will force compilation of both python and numpy\""
+        Unconditionally skip FFMpeg installation/building.\""
 
 ##### Main Vars #####
 
@@ -205,22 +248,25 @@ SUDO="sudo"
 
 PYTHON_VERSION="3.4.0"
 PYTHON_VERSION_MIN="3.4"
+PYTHON_FORCE_BUILD=false
 PYTHON_FORCE_REBUILD=false
 PYTHON_SKIP=false
 
 NUMPY_VERSION="1.8.1"
 NUMPY_VERSION_MIN="1.8"
+NUMPY_FORCE_BUILD=false
 NUMPY_FORCE_REBUILD=false
 NUMPY_SKIP=false
-NUMPY_REQUIRED=false
 
 BOOST_VERSION="1.51.0"
 BOOST_VERSION_MIN="1.49"
+BOOST_FORCE_BUILD=false
 BOOST_FORCE_REBUILD=false
 BOOST_SKIP=false
 
 OCIO_VERSION="1.0.9"
 OCIO_VERSION_MIN="1.0"
+OCIO_FORCE_BUILD=false
 OCIO_FORCE_REBUILD=false
 OCIO_SKIP=false
 
@@ -228,6 +274,7 @@ OPENEXR_VERSION="2.2.0"
 OPENEXR_VERSION_MIN="2.0.1"
 ILMBASE_VERSION="2.2.0"
 ILMBASE_VERSION_MIN="2.2"
+OPENEXR_FORCE_BUILD=false
 OPENEXR_FORCE_REBUILD=false
 OPENEXR_SKIP=false
 _with_built_openexr=false
@@ -235,34 +282,40 @@ _with_built_openexr=false
 OIIO_VERSION="1.4.16"
 OIIO_VERSION_MIN="1.4.0"
 OIIO_VERSION_MAX="1.5.0"  # Not supported by current OSL...
+OIIO_FORCE_BUILD=false
 OIIO_FORCE_REBUILD=false
 OIIO_SKIP=false
 
 LLVM_VERSION="3.4"
 LLVM_VERSION_MIN="3.4"
 LLVM_VERSION_FOUND=""
+LLVM_FORCE_BUILD=false
 LLVM_FORCE_REBUILD=false
 LLVM_SKIP=false
 
 # OSL needs to be compiled for now!
 OSL_VERSION="1.5.11"
 OSL_VERSION_MIN=$OSL_VERSION
+OSL_FORCE_BUILD=false
 OSL_FORCE_REBUILD=false
 OSL_SKIP=false
 
 # OpenSubdiv needs to be compiled for now
 OSD_VERSION="3.0.2"
 OSD_VERSION_MIN=$OSD_VERSION
+OSD_FORCE_BUILD=false
 OSD_FORCE_REBUILD=false
 OSD_SKIP=false
 
 # Version??
 OPENCOLLADA_VERSION="1.3"
+OPENCOLLADA_FORCE_BUILD=true  # no package!
 OPENCOLLADA_FORCE_REBUILD=false
 OPENCOLLADA_SKIP=false
 
 FFMPEG_VERSION="2.1.5"
 FFMPEG_VERSION_MIN="2.1.5"
+FFMPEG_FORCE_BUILD=false
 FFMPEG_FORCE_REBUILD=false
 FFMPEG_SKIP=false
 _ffmpeg_list_sep=";"
@@ -402,11 +455,65 @@ while true; do
       OSL_VERSION_MIN=$OSL_VERSION
       shift; shift; continue
     ;;
-  --ver-osd)
+    --ver-osd)
       OSD_VERSION="$2"
       OSD_VERSION_MIN=$OSD_VERSION
       shift; shift; continue
     ;;
+    --build-all)
+      PYTHON_FORCE_BUILD=true
+      NUMPY_FORCE_BUILD=true
+      BOOST_FORCE_BUILD=true
+      OCIO_FORCE_BUILD=true
+      OPENEXR_FORCE_BUILD=true
+      OIIO_FORCE_BUILD=true
+      LLVM_FORCE_BUILD=true
+      OSL_FORCE_BUILD=true
+      OSD_FORCE_BUILD=true
+      OPENCOLLADA_FORCE_BUILD=true
+      FFMPEG_FORCE_BUILD=true
+      shift; continue
+    ;;
+    --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)
+      BOOST_FORCE_BUILD=true; shift; continue
+    ;;
+    --build-ocio)
+      OCIO_FORCE_BUILD=true; shift; continue
+    ;;
+    --build-openexr)
+      OPENEXR_FORCE_BUILD=true; shift; continue
+    ;;
+    --build-oiio)
+      OIIO_FORCE_BUILD=true
+      shift; continue
+    ;;
+    --build-llvm)
+      LLVM_FORCE_BUILD=true
+      OSL_FORCE_BUILD=true
+      shift; continue
+    ;;
+    --build-osl)
+      OSL_FORCE_BUILD=true; shift; continue
+    ;;
+    --build-osd)
+      OSD_FORCE_BUILD=true; shift; continue
+    ;;
+    --build-opencollada)
+      OPENCOLLADA_FORCE_BUILD=true; shift; continue
+    ;;
+    --build-ffmpeg)
+      FFMPEG_FORCE_BUILD=true; shift; continue
+    ;;
     --force-all)
       PYTHON_FORCE_REBUILD=true
       NUMPY_FORCE_REBUILD=true
@@ -492,9 +599,6 @@ while true; do
     --skip-ffmpeg)
       FFMPEG_SKIP=true; shift; continue
     ;;
-    --required-numpy)
-      NUMPY_REQUIRED=true; shift; continue
-    ;;
     --)
       # no more arguments to parse
       break
@@ -517,7 +621,7 @@ fi
 
 
 # This has to be done here, because user might force some versions...
-PYTHON_SOURCE=( "http://python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz" )
+PYTHON_SOURCE=( "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz" )
 NUMPY_SOURCE=( "http://sourceforge.net/projects/numpy/files/NumPy/$NUMPY_VERSION/numpy-$NUMPY_VERSION.tar.gz" )
 
 _boost_version_nodots=`echo "$BOOST_VERSION" | sed -r 's/\./_/g'`
@@ -584,6 +688,7 @@ DEPS_SPECIFIC_INFO="\"BUILDABLE DEPENDENCIES:
 
 The following libraries will probably not all be available as packages in your distribution
 (install_deps will by default try to install packages, and fall back to building missing ones).
+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).
@@ -2146,14 +2251,19 @@ install_DEB() {
     fi
   fi
 
+
   PRINT ""
+  _do_compile_python=false
   if $PYTHON_SKIP; then
-    WARNING "Skipping Python installation, as requested..."
+    WARNING "Skipping Python/NumPy installation, as requested..."
+  elif [ "$PYTHON_FORCE_BUILD" = true ]; then
+    INFO "Forced Python/NumPy building, as requested..."
+    _do_compile_python=true
   else
-    _do_compile=false
     check_package_DEB python$PYTHON_VERSION_MIN-dev
     if [ $? -eq 0 ]; then
       install_packages_DEB python$PYTHON_VERSION_MIN-dev
+      clean_Python
       PRINT ""
       if $NUMPY_SKIP; then
         WARNING "Skipping NumPy installation, as requested..."
@@ -2161,35 +2271,33 @@ install_DEB() {
         check_package_DEB python3-numpy
         if [ $? -eq 0 ]; then
           install_packages_DEB python3-numpy
-        elif $NUMPY_REQUIRED; then
-          WARNING "Valid python package but no valid numpy package!" \
-                 "    Building both Python and Numpy from sources!"
-          _do_compile=true
         else
           WARNING "Sorry, using python package but no valid numpy package available!" \
-                  "    Use --required-numpy to force building of both Python and numpy."
+                  "    Use --build-numpy to force building of both Python and NumPy."
         fi
       fi
     else
-      _do_compile=true
+      _do_compile_python=true
     fi
+  fi
 
-    if $_do_compile; then
-      compile_Python
-      PRINT ""
-      if $NUMPY_SKIP; then
-        WARNING "Skipping NumPy installation, as requested..."
-      else
-        compile_Numpy
-      fi
+  if $_do_compile_python; then
+    compile_Python
+    PRINT ""
+    if $NUMPY_SKIP; then
+      WARNING "Skipping NumPy installation, as requested..."
     else
-      clean_Python
+      compile_Numpy
     fi
   fi
 
+
   PRINT ""
   if $BOOST_SKIP; then
     WARNING "Skipping Boost installation, as requested..."
+  elif [ "$BOOST_FORCE_BUILD" = true ]; then
+    INFO "Forced Boost building, as requested..."
+    compile_Boost
   else
     check_package_version_ge_DEB libboost-dev $BOOST_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -2211,9 +2319,13 @@ install_DEB() {
     fi
   fi
 
+
   PRINT ""
   if $OCIO_SKIP; then
     WARNING "Skipping OpenColorIO installation, as requested..."
+  elif [ "$OCIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenColorIO building, as requested..."
+    compile_OCIO
   else
     # XXX Always force build of own OCIO, until linux distro guys update their package to default libyaml-cpp ver (0.5)!
     #check_package_version_ge_DEB libopencolorio-dev $OCIO_VERSION_MIN
@@ -2225,9 +2337,13 @@ install_DEB() {
     #fi
   fi
 
+
   PRINT ""
   if $OPENEXR_SKIP; then
-    WARNING "Skipping OpenEXR installation, as requested..."
+    WARNING "Skipping ILMBase/OpenEXR installation, as requested..."
+  elif [ "$OPENEXR_FORCE_BUILD" = true ]; then
+    INFO "Forced ILMBase/OpenEXR building, as requested..."
+    compile_OPENEXR
   else
     check_package_version_ge_DEB libopenexr-dev $OPENEXR_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -2240,9 +2356,13 @@ install_DEB() {
     fi
   fi
 
+
   PRINT ""
   if $OIIO_SKIP; then
     WARNING "Skipping OpenImageIO installation, as requested..."
+  elif [ "$OIIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenImageIO building, as requested..."
+    compile_OIIO
   else
     check_package_version_ge_lt_DEB libopenimageio-dev $OIIO_VERSION_MIN $OIIO_VERSION_MAX
     if [ $? -eq 0 -a $_with_built_openexr == false ]; then
@@ -2253,11 +2373,15 @@ install_DEB() {
     fi
   fi
 
-  have_llvm=false
 
   PRINT ""
+  have_llvm=false
+  _do_compile_llvm=false
   if $LLVM_SKIP; then
     WARNING "Skipping LLVM installation, as requested (this also implies skipping OSL!)..."
+  elif [ "$LLVM_FORCE_BUILD" = true ]; then
+    INFO "Forced LLVM building, as requested..."
+    _do_compile_llvm=true
   else
     check_package_DEB llvm-$LLVM_VERSION-dev
     if [ $? -eq 0 ]; then
@@ -2273,24 +2397,37 @@ install_DEB() {
         LLVM_VERSION_FOUND=""  # Using default one, no need to specify it!
         clean_LLVM
       else
-        install_packages_DEB libffi-dev
-        # LLVM can't find the debian ffi header dir
-        _FFI_INCLUDE_DIR=`dpkg -L libffi-dev | grep -e ".*/ffi.h" | sed -r 's/(.*)\/ffi.h/\1/'`
-        PRINT ""
-        compile_LLVM
-        have_llvm=true
-        LLVM_VERSION_FOUND=$LLVM_VERSION
+        _do_compile_llvm=true
       fi
     fi
   fi
 
+  if [ "$_do_compile_llvm" = true ]; then
+    install_packages_DEB libffi-dev
+    # LLVM can't find the debian ffi header dir
+    _FFI_INCLUDE_DIR=`dpkg -L libffi-dev | grep -e ".*/ffi.h" | sed -r 's/(.*)\/ffi.h/\1/'`
+    PRINT ""
+    compile_LLVM
+    have_llvm=true
+    LLVM_VERSION_FOUND=$LLVM_VERSION
+  fi
+
+
   PRINT ""
+  _do_compile_osl=false
   if $OSL_SKIP; then
     WARNING "Skipping OpenShadingLanguage installation, as requested..."
+  elif [ "$OSL_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenShadingLanguage building, as requested..."
+    _do_compile_osl=true
   else
+      # No package currently!
+    _do_compile_osl=true
+  fi
+
+  if [ "$_do_compile_osl" = true ]; then
     if $have_llvm; then
       install_packages_DEB flex bison libtbb-dev
-      # No package currently!
       PRINT ""
       compile_OSL
     else
@@ -2298,13 +2435,22 @@ install_DEB() {
     fi
   fi
 
+
   PRINT ""
+  _do_compile_osd=false
   if $OSD_SKIP; then
     WARNING "Skipping OpenSubdiv installation, as requested..."
+  elif [ "$OSD_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenSubdiv building, as requested..."
+    _do_compile_osd=true
   else
+      # No package currently!
+    _do_compile_osd=true
+  fi
+
+  if [ "$_do_compile_osd" = true ]; then
     if $have_llvm; then
       install_packages_DEB flex bison libtbb-dev
-      # No package currently!
       PRINT ""
       compile_OSD
     else
@@ -2312,11 +2458,21 @@ install_DEB() {
     fi
   fi
 
+
   if $WITH_OPENCOLLADA; then
+    _do_compile_collada=false
     PRINT ""
     if $OPENCOLLADA_SKIP; then
       WARNING "Skipping OpenCOLLADA installation, as requested..."
+    elif [ "$OPENCOLLADA_FORCE_BUILD" = true ]; then
+      INFO "Forced OpenCollada building, as requested..."
+      _do_compile_collada=true
     else
+        # No package currently!
+      _do_compile_collada=true
+    fi
+
+    if [ "$_do_compile_collada" = true ]; then
       install_packages_DEB libpcre3-dev
       # Find path to libxml shared lib...
       _XML2_LIB=`dpkg -L libxml2-dev | grep -e ".*/libxml2.so"`
@@ -2326,9 +2482,13 @@ install_DEB() {
     fi
   fi
 
+
   PRINT ""
   if $FFMPEG_SKIP; then
     WARNING "Skipping FFMpeg installation, as requested..."
+  elif [ "$FFMPEG_FORCE_BUILD" = true ]; then
+    INFO "Forced FFMpeg building, as requested..."
+    compile_FFmpeg
   else
 #    XXX Debian features libav packages as ffmpeg, those are not really compatible with blender code currently :/
 #        So for now, always build our own ffmpeg.
@@ -2617,14 +2777,19 @@ install_RPM() {
     install_packages_RPM libspnav-devel
   fi
 
+
   PRINT ""
+  _do_compile_python=false
   if $PYTHON_SKIP; then
     WARNING "Skipping Python installation, as requested..."
+  elif [ "$PYTHON_FORCE_BUILD" = true ]; then
+    INFO "Forced Python/NumPy building, as requested..."
+    _do_compile_python=true
   else
-    _do_compile=false
     check_package_version_match_RPM python3-devel $PYTHON_VERSION_MIN
     if [ $? -eq 0 ]; then
       install_packages_RPM python3-devel
+      clean_Python
       PRINT ""
       if $NUMPY_SKIP; then
         WARNING "Skipping NumPy installation, as requested..."
@@ -2632,35 +2797,33 @@ install_RPM() {
         check_package_version_ge_RPM python3-numpy $NUMPY_VERSION_MIN
         if [ $? -eq 0 ]; then
           install_packages_RPM python3-numpy
-        elif $NUMPY_REQUIRED; then
-          WARNING "Valid python package but no valid numpy package!" \
-                  "    Building both Python and Numpy from sources!"
-          _do_compile=true
         else
           WARNING "Sorry, using python package but no valid numpy package available!" \
-                  "    Use --required-numpy to force building of both Python and numpy."
+                  "    Use --build-numpy to force building of both Python and NumPy."
         fi
       fi
     else
-      _do_compile=true
+      _do_compile_python=true
     fi
+  fi
 
-    if $_do_compile; then
-      compile_Python
-      PRINT ""
-      if $NUMPY_SKIP; then
-        WARNING "Skipping NumPy installation, as requested..."
-      else
-        compile_Numpy
-      fi
+  if $_do_compile_python; then
+    compile_Python
+    PRINT ""
+    if $NUMPY_SKIP; then
+      WARNING "Skipping NumPy installation, as requested..."
     else
-      clean_Python
+      compile_Numpy
     fi
   fi
 
+
   PRINT ""
   if $BOOST_SKIP; then
     WARNING "Skipping Boost installation, as requested..."
+  elif [ "$BOOST_FORCE_BUILD" = true ]; then
+    INFO "Forced Boost building, as requested..."
+    compile_Boost
   else
     check_package_version_ge_RPM boost-devel $BOOST_VERSION
     if [ $? -eq 0 ]; then
@@ -2671,9 +2834,13 @@ install_RPM() {
     fi
   fi
 
+
   PRINT ""
   if $OCIO_SKIP; then
     WARNING "Skipping OpenColorIO installation, as requested..."
+  elif [ "$OCIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenColorIO building, as requested..."
+    compile_OCIO
   else
     # XXX Always force build of own OCIO, until linux distro guys update their package to default libyaml-cpp ver (0.5)!
     #check_package_version_ge_RPM OpenColorIO-devel $OCIO_VERSION_MIN
@@ -2687,7 +2854,10 @@ install_RPM() {
 
   PRINT ""
   if $OPENEXR_SKIP; then
-    WARNING "Skipping OpenEXR installation, as requested..."
+    WARNING "Skipping ILMBase/OpenEXR installation, as requested..."
+  elif [ "$OPENEXR_FORCE_BUILD" = true ]; then
+    INFO "Forced ILMBase/OpenEXR building, as requested..."
+    compile_OPENEXR
   else
     check_package_version_ge_RPM $OPENEXR_DEV $OPENEXR_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -2703,6 +2873,9 @@ install_RPM() {
   PRINT ""
   if $OIIO_SKIP; then
     WARNING "Skipping OpenImageIO installation, as requested..."
+  elif [ "$OIIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenImageIO building, as requested..."
+    compile_OIIO
   else
     check_package_version_ge_lt_RPM OpenImageIO-devel $OIIO_VERSION_MIN $OIIO_VERSION_MAX
     if [ $? -eq 0 -a $_with_built_openexr == false ]; then
@@ -2713,11 +2886,15 @@ install_RPM() {
     fi
   fi
 
-  have_llvm=false
 
   PRINT ""
+  have_llvm=false
+  _do_compile_llvm=false
   if $LLVM_SKIP; then
     WARNING "Skipping LLVM installation, as requested (this also implies skipping OSL!)..."
+  elif [ "$LLVM_FORCE_BUILD" = true ]; then
+    INFO "Forced LLVM building, as requested..."
+    _do_compile_llvm=true
   else
     # Problem compiling with LLVM 3.2 so match version 3.1 ...
     check_package_version_match_RPM llvm $LLVM_VERSION
@@ -2734,22 +2911,35 @@ install_RPM() {
       #
       # Better to compile it than use minimum version from repo...
       #
-      install_packages_RPM libffi-devel
-      # LLVM can't find the fedora ffi header dir...
-      _FFI_INCLUDE_DIR=`rpm -ql libffi-devel | grep -e ".*/ffi.h" | sed -r 's/(.*)\/ffi.h/\1/'`
-      PRINT ""
-      compile_LLVM
-      have_llvm=true
-      LLVM_VERSION_FOUND=$LLVM_VERSION
+      _do_compile_llvm=true
     fi
   fi
 
+  if [ "$_do_compile_llvm" = true ]; then
+    install_packages_RPM libffi-devel
+    # LLVM can't find the fedora ffi header dir...
+    _FFI_INCLUDE_DIR=`rpm -ql libffi-devel | grep -e ".*/ffi.h" | sed -r 's/(.*)\/ffi.h/\1/'`
+    PRINT ""
+    compile_LLVM
+    have_llvm=true
+    LLVM_VERSION_FOUND=$LLVM_VERSION
+  fi
+
+
   PRINT ""
+  _do_compile_osl=true
   if $OSL_SKIP; then
     WARNING "Skipping OpenShadingLanguage installation, as requested..."
+  elif [ "$OSL_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenShadingLanguage building, as requested..."
+    _do_compile_osl=true
   else
+    # No package currently!
+    _do_compile_osl=true
+  fi
+
+  if [ "$_do_compile_osl" = true ]; then
     if $have_llvm; then
-      # No package currently!
       install_packages_RPM flex bison
       if [ $RPM = "FEDORA" -o $RPM = "RHEL" ]; then
         install_packages_RPM tbb-devel
@@ -2761,12 +2951,21 @@ install_RPM() {
     fi
   fi
 
+
   PRINT ""
+  _do_compile_osd=false
   if $OSD_SKIP; then
     WARNING "Skipping OpenSubdiv installation, as requested..."
+  elif [ "$OSD_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenSubdiv building, as requested..."
+    _do_compile_osd=true
   else
+    # No package currently!
+    _do_compile_osd=true
+  fi
+
+  if [ "$_do_compile_osd" = true ]; then
     if $have_llvm; then
-      # No package currently!
       install_packages_RPM flex bison
       if [ $RPM = "FEDORA" -o $RPM = "RHEL" ]; then
         install_packages_RPM tbb-devel
@@ -2778,23 +2977,36 @@ install_RPM() {
     fi
   fi
 
+
   if $WITH_OPENCOLLADA; then
     PRINT ""
+    _do_compile_collada=false
     if $OPENCOLLADA_SKIP; then
       WARNING "Skipping OpenCOLLADA installation, as requested..."
+    elif [ "$OPENCOLLADA_FORCE_BUILD" = true ]; then
+      INFO "Forced OpenCollada building, as requested..."
+      _do_compile_collada=true
     else
+      # No package...
+      _do_compile_collada=true
+    fi
+
+    if [ "$_do_compile_collada" = true ]; then
       install_packages_RPM pcre-devel
       # Find path to libxml shared lib...
       _XML2_LIB=`rpm -ql libxml2-devel | grep -e ".*/libxml2.so"`
-      # No package...
       PRINT ""
       compile_OpenCOLLADA
     fi
   fi
 
+
   PRINT ""
   if $FFMPEG_SKIP; then
     WARNING "Skipping FFMpeg installation, as requested..."
+  elif [ "$FFMPEG_FORCE_BUILD" = true ]; then
+    INFO "Forced FFMpeg building, as requested..."
+    compile_FFmpeg
   else
     check_package_version_ge_RPM ffmpeg $FFMPEG_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -2954,14 +3166,19 @@ install_ARCH() {
     fi
   fi
 
+
   PRINT ""
+  _do_compile_python=false
   if $PYTHON_SKIP; then
     WARNING "Skipping Python installation, as requested..."
+  elif [ "$PYTHON_FORCE_BUILD" = true ]; then
+    INFO "Forced Python/NumPy building, as requested..."
+    _do_compile_python=true
   else
-    _do_compile=false
     check_package_version_ge_ARCH python $PYTHON_VERSION_MIN
     if [ $? -eq 0 ]; then
       install_packages_ARCH python
+      clean_Python
       PRINT ""
       if $WITH_NUMPY; then
         if $NUMPY_SKIP; then
@@ -2970,36 +3187,34 @@ install_ARCH() {
           check_package_version_ge_ARCH python-numpy $NUMPY_VERSION_MIN
           if [ $? -eq 0 ]; then
             install_packages_ARCH python-numpy
-        elif $NUMPY_REQUIRED; then
-          WARNING "Valid python package but no valid numpy package!" \
-                  "    Building both Python and Numpy from sources!"
-          _do_compile=true
         else
           WARNING "Sorry, using python package but no valid numpy package available!" \
-                  "    Use --required-numpy to force building of both Python and numpy."
+                  "    Use --build-numpy to force building of both Python and NumPy."
           fi
         fi
       fi
     else
-      _do_compile=true
+      _do_compile_python=true
     fi
+  fi
 
-    if $_do_compile; then
-      compile_Python
-      PRINT ""
-      if $NUMPY_SKIP; then
-        WARNING "Skipping NumPy installation, as requested..."
-      else
-        compile_Numpy
-      fi
+  if $_do_compile_python; then
+    compile_Python
+    PRINT ""
+    if $NUMPY_SKIP; then
+      WARNING "Skipping NumPy installation, as requested..."
     else
-      clean_Python
+      compile_Numpy
     fi
   fi
 
+
   PRINT ""
   if $BOOST_SKIP; then
     WARNING "Skipping Boost installation, as requested..."
+  elif [ "$BOOST_FORCE_BUILD" = true ]; then
+    INFO "Forced Boost building, as requested..."
+    compile_Boost
   else
     check_package_version_ge_ARCH boost $BOOST_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -3011,8 +3226,12 @@ install_ARCH() {
   fi
 
   PRINT ""
+  _do_compile_ocio=false
   if $OCIO_SKIP; then
     WARNING "Skipping OpenColorIO installation, as requested..."
+  elif [ "$OCIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenColorIO building, as requested..."
+    _do_compile_ocio=true
   else
     # XXX Always force build of own OCIO, until linux distro guys update their package to default libyaml-cpp ver (0.5)!
     #check_package_version_ge_ARCH opencolorio $OCIO_VERSION_MIN
@@ -3020,14 +3239,22 @@ install_ARCH() {
       #install_packages_ARCH opencolorio yaml-cpp tinyxml
       #clean_OCIO
     #else
-      install_packages_ARCH yaml-cpp tinyxml
-      compile_OCIO
+      _do_compile_ocio=true
     #fi
   fi
 
+  if [ "$_do_compile_ocio" = true ]; then
+    install_packages_ARCH yaml-cpp tinyxml
+    compile_OCIO
+  fi
+
+
   PRINT ""
   if $OPENEXR_SKIP; then
-    WARNING "Skipping OpenEXR installation, as requested..."
+    WARNING "Skipping ILMBase/OpenEXR installation, as requested..."
+  elif [ "$OPENEXR_FORCE_BUILD" = true ]; then
+    INFO "Forced ILMBase/OpenEXR building, as requested..."
+    compile_OPENEXR
   else
     check_package_version_ge_ARCH openexr $OPENEXR_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -3040,9 +3267,13 @@ install_ARCH() {
     fi
   fi
 
+
   PRINT ""
   if $OIIO_SKIP; then
     WARNING "Skipping OpenImageIO installation, as requested..."
+  elif [ "$OIIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenImageIO building, as requested..."
+    compile_OIIO
   else
     check_package_version_ge_lt_ARCH openimageio $OIIO_VERSION_MIN $OIIO_VERSION_MAX
     if [ $? -eq 0 ]; then
@@ -3053,11 +3284,15 @@ install_ARCH() {
     fi
   fi
 
-  have_llvm=false
 
   PRINT ""
+  have_llvm=false
+  _do_compile_llvm=false
   if $LLVM_SKIP; then
     WARNING "Skipping LLVM installation, as requested (this also implies skipping OSL!)..."
+  elif [ "$LLVM_FORCE_BUILD" = true ]; then
+    INFO "Forced LLVM building, as requested..."
+    _do_compile_llvm=true
   else
     check_package_version_ge_ARCH llvm $LLVM_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -3067,44 +3302,66 @@ install_ARCH() {
       LLVM_VERSION_FOUND=$LLVM_VERSION
       clean_LLVM
     else
-      install_packages_ARCH libffi
-      # LLVM can't find the arch ffi header dir...
-      _FFI_INCLUDE_DIR=`pacman -Ql libffi | grep -e ".*/ffi.h" | awk '{print $2}' | sed -r 's/(.*)\/ffi.h/\1/'`
-      # LLVM 3.1 needs python2 to build and arch defaults to python3
-      _PYTHON2_BIN="/usr/bin/python2"
-      PRINT ""
-      compile_LLVM
-      have_llvm=true
-      LLVM_VERSION_FOUND=$LLVM_VERSION
+      _do_compile_llvm=true
     fi
   fi
 
+  if [ "$_do_compile_llvm" = true ]; then
+    install_packages_ARCH libffi
+    # LLVM can't find the arch ffi header dir...
+    _FFI_INCLUDE_DIR=`pacman -Ql libffi | grep -e ".*/ffi.h" | awk '{print $2}' | sed -r 's/(.*)\/ffi.h/\1/'`
+    # LLVM 3.1 needs python2 to build and arch defaults to python3
+    _PYTHON2_BIN="/usr/bin/python2"
+    PRINT ""
+    compile_LLVM
+    have_llvm=true
+    LLVM_VERSION_FOUND=$LLVM_VERSION
+  fi
+
+
   PRINT ""
+  _do_compile_osl=false
   if $OSL_SKIP; then
     WARNING "Skipping OpenShadingLanguage installation, as requested..."
+  elif [ "$OSL_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenShadingLanguage building, as requested..."
+    _do_compile_osl=true
   else
+    check_package_version_ge_ARCH openshadinglanguage $OSL_VERSION_MIN
+    if [ $? -eq 0 ]; then
+      install_packages_ARCH openshadinglanguage
+      clean_OSL
+    else
+      _do_compile_osl=true
+    fi
+  fi
+
+  if [ "$_do_compile_osl" = true ]; then
     if $have_llvm; then
-      check_package_version_ge_ARCH openshadinglanguage $OSL_VERSION_MIN
-      if [ $? -eq 0 ]; then
-        install_packages_ARCH openshadinglanguage
-        clean_OSL
-      else
-        #XXX Note: will fail to build with LLVM 3.2! 
-        install_packages_ARCH intel-tbb
-        PRINT ""
-        compile_OSL
-      fi
+      #XXX Note: will fail to build with LLVM 3.2! 
+      install_packages_ARCH intel-tbb
+      PRINT ""
+      compile_OSL
     else
       WARNING "No LLVM available, cannot build OSL!"
     fi
   fi
 
+
   PRINT ""
+  _do_compile_osd=false
   if $OSD_SKIP; then
     WARNING "Skipping OpenSubdiv installation, as requested..."
+  elif [ "$OSD_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenSubdiv building, as requested..."
+    _do_compile_osd=true
   else
+    # No package currently? Just build for now!
+    _do_compile_osd=true
+  fi
+
+  if [ "$_do_compile_osd" = true ]; then
     if $have_llvm; then
-      # No package currently? Just build for now!
       install_packages_ARCH intel-tbb
       PRINT ""
       compile_OSD
@@ -3113,28 +3370,41 @@ install_ARCH() {
     fi
   fi
 
+
   if $WITH_OPENCOLLADA; then
     PRINT ""
+    _do_compile_collada=false
     if $OPENCOLLADA_SKIP; then
       WARNING "Skipping OpenCOLLADA installation, as requested..."
+    elif [ "$OPENCOLLADA_FORCE_BUILD" = true ]; then
+      INFO "Forced OpenCollada building, as requested..."
+      _do_compile_collada=true
     else
       check_package_ARCH opencollada
       if [ $? -eq 0 ]; then
         install_packages_ARCH opencollada
         clean_OpenCOLLADA
       else
-        install_packages_ARCH pcre
-        PRINT ""
-        compile_OpenCOLLADA
+        _do_compile_collada=true
       fi
-    # Find path to libxml shared lib...
-    _XML2_LIB=`pacman -Ql libxml2 | grep -e ".*/libxml2.so$" | gawk '{print $2}'`
+    fi
+
+    if [ "$_do_compile_collada" = true ]; then
+      install_packages_ARCH pcre
+      # Find path to libxml shared lib...
+      _XML2_LIB=`pacman -Ql libxml2 | grep -e ".*/libxml2.so$" | gawk '{print $2}'`
+      PRINT ""
+      compile_OpenCOLLADA
     fi
   fi
 
+
   PRINT ""
   if $FFMPEG_SKIP; then
     WARNING "Skipping FFMpeg installation, as requested..."
+  elif [ "$FFMPEG_FORCE_BUILD" = true ]; then
+    INFO "Forced FFMpeg building, as requested..."
+    compile_FFmpeg
   else
     check_package_version_ge_ARCH ffmpeg $FFMPEG_VERSION_MIN
     if [ $? -eq 0 ]; then
@@ -3147,6 +3417,179 @@ install_ARCH() {
 }
 
 
+#### Install on other distro (very limited!) ####
+
+install_OTHER() {
+  PRINT ""
+  WARNING "Attempt to build main dependencies for other linux distributions."
+  PRINT ""
+  PRINT "`eval _echo "$COMMON_INFO"`"
+  PRINT ""
+
+  ERROR "Failed to detect distribution type."
+  PRINT ""
+  PRINT "Your distribution is not supported by this script, you'll have to install dependencies and"
+  PRINT "dev packages yourself. However, this script can still attempt to build main (complex) libraries for you,"
+  PRINT "if you use '--build-foo' options (you can try '--build-all' one first)."
+  PRINT ""
+  PRINT "Quite obviously, it assumes dependencies from those libraries are already available, otherwise please"
+  PRINT "install them (you can also use error messages printed out by build process to find missing libraries...)."
+  PRINT ""
+  PRINT "`eval _echo "$DEPS_COMMON_INFO"`"
+  PRINT ""
+  PRINT "`eval _echo "$DEPS_SPECIFIC_INFO"`"
+  PRINT ""
+
+  read -p "Do you want to continue (Y/n)?"
+  [ "$(echo ${REPLY:=Y} | tr [:upper:] [:lower:])" != "y" ] && exit
+
+  PRINT ""
+  _do_compile_python=false
+  if $PYTHON_SKIP; then
+    WARNING "Skipping Python/NumPy installation, as requested..."
+  elif [ "$PYTHON_FORCE_BUILD" = true ]; then
+    INFO "Forced Python/NumPy building, as requested..."
+    _do_compile_python=true
+  fi
+
+  if $_do_compile_python; then
+    compile_Python
+    PRINT ""
+    if $NUMPY_SKIP; then
+      WARNING "Skipping NumPy installation, as requested..."
+    else
+      compile_Numpy
+    fi
+  fi
+
+
+  PRINT ""
+  if $BOOST_SKIP; then
+    WARNING "Skipping Boost installation, as requested..."
+  elif [ "$BOOST_FORCE_BUILD" = true ]; then
+    INFO "Forced Boost building, as requested..."
+    compile_Boost
+  fi
+
+
+  PRINT ""
+  if $OCIO_SKIP; then
+    WARNING "Skipping OpenColorIO installation, as requested..."
+  elif [ "$OCIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenColorIO building, as requested..."
+    compile_OCIO
+  fi
+
+
+  PRINT ""
+  if $OPENEXR_SKIP; then
+    WARNING "Skipping ILMBase/OpenEXR installation, as requested..."
+  elif [ "$OPENEXR_FORCE_BUILD" = true ]; then
+    INFO "Forced ILMBase/OpenEXR building, as requested..."
+    compile_OPENEXR
+  fi
+
+
+  PRINT ""
+  if $OIIO_SKIP; then
+    WARNING "Skipping OpenImageIO installation, as requested..."
+  elif [ "$OIIO_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenImageIO building, as requested..."
+    compile_OIIO
+  fi
+
+
+  PRINT ""
+  have_llvm=false
+  _do_compile_llvm=false
+  if $LLVM_SKIP; then
+    WARNING "Skipping LLVM installation, as requested (this also implies skipping OSL!)..."
+  elif [ "$LLVM_FORCE_BUILD" = true ]; then
+    INFO "Forced LLVM building, as requested..."
+    _do_compile_llvm=true
+  fi
+
+  if [ "$_do_compile_llvm" = true ]; then
+    install_packages_DEB libffi-dev
+    # LLVM can't find the debian ffi header dir
+    _FFI_INCLUDE_DIR=`dpkg -L libffi-dev | grep -e ".*/ffi.h" | sed -r 's/(.*)\/ffi.h/\1/'`
+    PRINT ""
+    compile_LLVM
+    have_llvm=true
+    LLVM_VERSION_FOUND=$LLVM_VERSION
+  fi
+
+
+  PRINT ""
+  _do_compile_osl=false
+  if $OSL_SKIP; then
+    WARNING "Skipping OpenShadingLanguage installation, as requested..."
+  elif [ "$OSL_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenShadingLanguage building, as requested..."
+    _do_compile_osl=true
+  fi
+
+  if [ "$_do_compile_osl" = true ]; then
+    if $have_llvm; then
+      install_packages_DEB flex bison libtbb-dev
+      PRINT ""
+      compile_OSL
+    else
+      WARNING "No LLVM available, cannot build OSL!"
+    fi
+  fi
+
+
+  PRINT ""
+  _do_compile_osd=false
+  if $OSD_SKIP; then
+    WARNING "Skipping OpenSubdiv installation, as requested..."
+  elif [ "$OSD_FORCE_BUILD" = true ]; then
+    INFO "Forced OpenSubdiv building, as requested..."
+    _do_compile_osd=true
+  fi
+
+  if [ "$_do_compile_osd" = true ]; then
+    if $have_llvm; then
+      install_packages_DEB flex bison libtbb-dev
+      PRINT ""
+      compile_OSD
+    else
+      WARNING "No LLVM available, cannot build OSD!"
+    fi
+  fi
+
+
+  if $WITH_OPENCOLLADA; then
+    _do_compile_collada=false
+    PRINT ""
+    if $OPENCOLLADA_SKIP; then
+      WARNING "Skipping OpenCOLLADA installation, as requested..."
+    elif [ "$OPENCOLLADA_FORCE_BUILD" = true ]; then
+      INFO "Forced OpenCollada building, as requested..."
+      _do_compile_collada=true
+    fi
+
+    if [ "$_do_compile_collada" = true ]; then
+      install_packages_DEB libpcre3-dev
+      # Find path to libxml shared lib...
+      _XML2_LIB=`dpkg -L libxml2-dev | grep -e ".*/libxml2.so"`
+      # No package
+      PRINT ""
+      compile_OpenCOLLADA
+    fi
+  fi
+
+
+  PRINT ""
+  if $FFMPEG_SKIP; then
+    WARNING "Skipping FFMpeg installation, as requested..."
+  elif [ "$FFMPEG_FORCE_BUILD" = true ]; then
+    INFO "Forced FFMpeg building, as requested..."
+    compile_FFmpeg
+  fi
+}
+
 #### Printing User Info ####
 
 print_info_ffmpeglink_DEB() {
@@ -3223,6 +3666,9 @@ print_info() {
   PRINT "(provided obviously you did not add anything yourself in those dirs!), and run install_deps.sh again!"
   PRINT "Often, changes in the libs built by this script, or in your distro package, cannot be handled simply, so..."
   PRINT ""
+  PRINT "You may also try to use the '--build-foo' options to bypass your distribution's packages"
+  PRINT "for some troublesome/buggy libraries..."
+  PRINT ""
   PRINT ""
   PRINT "Ran with:"
   PRINT "    install_deps.sh $COMMANDLINE"
@@ -3419,16 +3865,8 @@ elif [ -f /etc/redhat-release -o /etc/SuSE-release ]; then
   DISTRO="RPM"
   install_RPM
 else
-  ERROR "Failed to detect distribution type."
-  PRINT ""
-  PRINT "Your distribution is not supported by this script, you'll have to install dependencies and"
-  PRINT "dev packages yourself."
-  PRINT ""
-  PRINT "`eval _echo "$DEPS_COMMON_INFO"`"
-  PRINT ""
-  PRINT "`eval _echo "$DEPS_SPECIFIC_INFO"`"
-  PRINT ""
-  exit 1
+  DISTRO="OTHER"
+  install_OTHER
 fi
 
 print_info | tee $INFO_PATH/BUILD_NOTES.txt