[network-manager-vpnc] build: fix handling of GTK requirement if none was given

[Dan Williams <dcbw src gnome org>]

commit 8f789ebcbf732fb2e5c8ef1fd82b20faefbf109b
Author: Dan Williams <dcbw redhat com>
Date:   Wed Aug 17 16:24:22 2011 -0500

    build: fix handling of GTK requirement if none was given
    
    Previously the logic defaulted to requiring GTK3, but that broke
    when doing 'make distcheck' if you didn't have GTK3.  So if the
    user didn't give a specific GTK version, just pick one
    automatically.

 configure.ac |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bf6d0a9..2f5ed3a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -67,13 +67,19 @@ AC_SUBST(DBUS_LIBS)
 
 if test x"$with_gnome" != xno; then
 	AC_ARG_WITH([gtkver], AS_HELP_STRING([--with-gtkver], [The major version of GTK+ to build with]),
-	            with_gtkver="$withval",with_gtkver=3)
+	            with_gtkver="$withval",with_gtkver=0)
+
+	gtk2_req=2.20
+	gtk3_req=2.91.4
 	case "${with_gtkver}" in
-	       2) PKG_CHECK_MODULES(GTK, gtk+-2.0 >= 2.20)
-	          gtkver=2
+	       0) PKG_CHECK_MODULES(GTK, gtk+-3.0 > $gtk3_req, ,
+	                            [PKG_CHECK_MODULES(GTK, gtk+-2.0 > $gtk2_req)])
+		  ;;
+	       2) PKG_CHECK_MODULES(GTK, gtk+-2.0 >= $gtk2_req)
+	          ;;
+	       3) PKG_CHECK_MODULES(GTK, gtk+-3.0 >= $gtk3_req)
 	          ;;
-	       *) PKG_CHECK_MODULES(GTK, gtk+-3.0 >= 2.91.4)
-	          gtkver=3
+	       *) AC_MSG_ERROR(unknown GTK+ version $with_gtkver!)
 	          ;;
 	esac
 	AC_SUBST(GTK_CFLAGS)