EXTRA_DIRS="${EXTRA_DIRS} $with_plib"
fi
+# specify the osg location
+AC_ARG_WITH(osg, [ --with-osg=PREFIX Specify the prefix path to osg])
+
+if test "x$with_osg" != "x" ; then
+ echo "osg prefix is $with_osg"
+ EXTRA_DIRS="${EXTRA_DIRS} $with_osg"
+fi
+
dnl Determine an extra directories to add to include/lib search paths
case "${host}" in
*-apple-darwin* | *-*-cygwin* | *-*-mingw32*)
simgear/scene/model/Makefile \
simgear/scene/sky/Makefile \
simgear/scene/tgdb/Makefile \
+ simgear/scene/util/Makefile \
simgear/screen/Makefile \
simgear/serial/Makefile \
simgear/sound/Makefile \