compiler gcc: fvisibility option exists on macos
add flags to linkflags and shlinkflags
do not add source code directories to the include paths
OSX fixes: CoreFoundation header, OpenGL (use Cocoa version), GLU, GLUT (use Cocoa framework)
Merge pull request #7 from devernay/osx

OSX fixes: CoreFoundation header, OpenGL (use Cocoa version), GLU, GLUT ...
adding SeExpr dependency
imagemagick on OSX should not be installed with X11 support (to avoid dependency on X11)
Merge pull request #8 from devernay/osx-imagemagick

imagemagick on OSX should not be installed with X11 support
imagemagick: fix indentation and add comment for x11 on macos
Remove rt dependency for macos in boost_log script
Merge pull request #9 from cbenhagen/patch-1

Remove rt dependency for macos in boost_log script
boost_log: minor, code simplification
Fix glu.py for windows
msvc: generate PDB debugging files on windows
Fix libav dependencies
macos dependencies fixes
Merge branch 'master' of git://github.com/tuttleofx/sconsProject
fix indent
swig: update pySwigBinding to detect python3

Add -py3 to swig if we use python3.x.
Fix SeExpr dependency