osgGAGetVersion() returns the library version number. Numbering convention : OpenSceneGraph-1.0 will return 1.0 from osgGAGetVersion.
This C function can be also used to check for the existence of the OpenSceneGraph library using autoconf and its m4 macro AC_CHECK_LIB.
Here is the code to add to your configure.in: #
# Check for the OpenSceneGraph (OSG) utility library
#
AC_CHECK_LIB(osg, osgGAGetVersion, ,
[AC_MSG_ERROR(OpenSceneGraph utility library not found. See http://www.openscenegraph.org)],)
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