+PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.14 gobject-2.0 gthread-2.0)
+PKG_CHECK_MODULES(CAIRO, cairo)
+PKG_CHECK_MODULES(GTK, gtk+-2.0 >= 2.16)
+PKG_CHECK_MODULES(SOUP, libsoup-2.4 >= 2.26)
+
+# Check for glut for example plugin
+AC_CHECK_LIB(glut, glutSolidTeapot, GLUT_LIBS="-lglut")
+AM_CONDITIONAL(HAVE_GLUT, test "$GLUT_LIBS" != "")
+AC_SUBST(GLUT_LIBS)
+
+# Test for windowing system
+case "${host}" in
+ *mingw32*) SYS="WIN" ;;
+ *cygwin*) SYS="WIN" ;;
+ *apple*) SYS="MAC" ;;
+ *) SYS="X11" ;;
+esac
+AM_CONDITIONAL([SYS_WIN], test "$SYS" = "WIN")
+AM_CONDITIONAL([SYS_MAC], test "$SYS" = "MAC")
+AM_CONDITIONAL([SYS_X11], test "$SYS" = "X11")
+if test "$WIN32" = yes; then
+ ac_default_prefix="/"
+fi