--- gigedit/trunk/configure.ac	2011/03/06 07:51:04	2169
+++ gigedit/trunk/configure.ac	2012/08/05 13:21:12	2359
@@ -66,11 +66,19 @@
 AM_CONDITIONAL(WINDOWS, test "$windows" = "yes")
 
 PKG_PROG_PKG_CONFIG
+have_gtk3=no
 PKG_CHECK_EXISTS(gtkmm-3.0 >= 2.99,
-        [PKG_CHECK_MODULES(GTKMM, gtkmm-3.0)],
+        [PKG_CHECK_MODULES(GTKMM, gtkmm-3.0, have_gtk3=yes)],
         [PKG_CHECK_MODULES(GTKMM, gtkmm-2.4 >= 2.8 gthread-2.0 cairomm-1.0)])
+AM_CONDITIONAL(HAVE_GTK3, [test "$have_gtk3" = "yes"])
+
+PKG_CHECK_MODULES(SIGC, sigc++-2.0)
+AC_SUBST(SIGC_CFLAGS)
+AC_SUBST(SIGC_LIBS)
 
 PKG_CHECK_MODULES(GIG, gig >= 3.3.0)
+AC_SUBST(GIG_CFLAGS)
+AC_SUBST(GIG_LIBS)
 
 # check for presence of libsndfile
 PKG_CHECK_MODULES(SNDFILE, sndfile >= 1.0.2)