lavd/decklink: Fix compile issue on OS X

Fixes #4124: Invalid argument '-std=c99' not allowed with 'C++/ObjC++'
C++ files fail to compile. This adds '-std=c++11' to CXX_FLAGS to fix.

Signed-off-by: Rick Kern <kernrj@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/configure b/configure
index 94a0a6c7a2..3787894d1d 100755
--- a/configure
+++ b/configure
@@ -4519,6 +4519,7 @@ fi
 
 add_cppflags -D_ISOC99_SOURCE
 add_cxxflags -D__STDC_CONSTANT_MACROS
+add_cxxflags -std=c++11
 check_cflags -std=c99
 check_cc -D_FILE_OFFSET_BITS=64 <<EOF && add_cppflags -D_FILE_OFFSET_BITS=64
 #include <stdlib.h>