+# provide a proper gxx_include_dir.
+# Note, if you change the default, make sure to fix both here and in
+# the gcc, libio, libstdc++ and libg++ subdirectories.
+# Check whether --with-gxx-include-dir or --without-gxx-include-dir was given.
+gxx_include_dir=
+if test -n "${with_gxx_include_dir}"; then
+ case "${with_gxx_include_dir}" in
+ yes )
+ echo "configure.in: error: bad value ${withval} given for g++ include directory" 1>&2
+ exit 1
+ ;;
+ no )
+ ;;
+ * )
+ gxx_include_dir=${with_gxx_include_dir}
+ ;;
+ esac
+fi
+if test x${gxx_include_dir} = x; then
+ if test x${enable_version_specific_runtime_libs} = xyes; then
+ gxx_include_dir='${libsubdir}/include/g++'
+ else
+ . ${topsrcdir}/config.if
+ gxx_include_dir='${prefix}/include/g++'-${libstdcxx_interface}
+ fi
+else
+ gxx_include_dir=${gxx_include_dir}
+fi
+