[banshee/gtk3] build: Look for Gtk# 3 first, fall back to Gtk#2

[Gabriel Burt <gburt src gnome org>]

commit ac75304d1d617fb6e0ce405f63b6b5d330b80c6b
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Fri Apr 8 16:40:55 2011 -0500

    build: Look for Gtk# 3 first, fall back to Gtk#2
    
    This commit only adjusts our autoconf, it doesn't actually port
    Hyena/Banshee to build against Gtk# 3.

 build/m4/banshee/gtk-sharp.m4 |   50 ++++++++++++++++++++++++++++------------
 configure.ac                  |    1 +
 2 files changed, 36 insertions(+), 15 deletions(-)
---
diff --git a/build/m4/banshee/gtk-sharp.m4 b/build/m4/banshee/gtk-sharp.m4
index 795bfdd..f5e5948 100644
--- a/build/m4/banshee/gtk-sharp.m4
+++ b/build/m4/banshee/gtk-sharp.m4
@@ -1,23 +1,43 @@
 AC_DEFUN([BANSHEE_CHECK_GTK_SHARP],
 [
-	GTKSHARP_REQUIRED=2.12
+	GTKSHARP3_REQUIRED=2.99
+	GTKSHARP2_REQUIRED=2.12
 
-	PKG_CHECK_MODULES(GTKSHARP,
-		gtk-sharp-2.0 >= $GTKSHARP_REQUIRED)
-	AC_SUBST(GTKSHARP_LIBS)
+	dnl First check for gtk-sharp-3.0
+	PKG_CHECK_MODULES(GTKSHARP, gtk-sharp-3.0 >= $GTKSHARP3_REQUIRED, have_gtk3=yes, have_gtk3=no)
+	if test "x$have_gtk3" = "xyes"; then
+		AC_SUBST(GTKSHARP_LIBS)
 
-	PKG_CHECK_MODULES(GLIBSHARP,
-		glib-sharp-2.0 >= $GTKSHARP_REQUIRED)
-	AC_SUBST(GLIBSHARP_LIBS)
+		PKG_CHECK_MODULES(GLIBSHARP, glib-sharp-3.0 >= $GTKSHARP3_REQUIRED)
+		AC_SUBST(GLIBSHARP_LIBS)
 
-	PKG_CHECK_MODULES(GLIBSHARP_2_12_7,
-		glib-sharp-2.0 >= 2.12.7,
-		HAVE_GLIBSHARP_2_12_7=yes,
-		HAVE_GLIBSHARP_2_12_7=no)
-	AM_CONDITIONAL(HAVE_GLIBSHARP_2_12_7, [test "$HAVE_GLIBSHARP_2_12_7" = "yes"])
+        gtk_version=3
+		AM_CONDITIONAL(HAVE_GTK3, true)
 
-    PKG_CHECK_MODULES(GTKSHARP_A11Y, gtk-sharp-2.0 >= 2.12.10, gtksharp_with_a11y=yes, gtksharp_with_a11y=no)
-	AM_CONDITIONAL(ENABLE_ATK, test "x$gtksharp_with_a11y" = "xyes")
+        HAVE_GLIBSHARP_2_12_7=yes
+		AM_CONDITIONAL(HAVE_GLIBSHARP_2_12_7, true)
 
-])
+        gtksharp_with_a11y=yes
+		AM_CONDITIONAL(ENABLE_ATK, true)
+	else
+		dnl Fall back to gtk-sharp-2.0
+
+		PKG_CHECK_MODULES(GTKSHARP, gtk-sharp-2.0 >= $GTKSHARP2_REQUIRED)
+		AC_SUBST(GTKSHARP_LIBS)
+
+		PKG_CHECK_MODULES(GLIBSHARP, glib-sharp-2.0 >= $GTKSHARP2_REQUIRED)
+		AC_SUBST(GLIBSHARP_LIBS)
 
+		PKG_CHECK_MODULES(GLIBSHARP_2_12_7,
+			glib-sharp-2.0 >= 2.12.7,
+			HAVE_GLIBSHARP_2_12_7=yes,
+			HAVE_GLIBSHARP_2_12_7=no)
+		AM_CONDITIONAL(HAVE_GLIBSHARP_2_12_7, [test "$HAVE_GLIBSHARP_2_12_7" = "yes"])
+
+		PKG_CHECK_MODULES(GTKSHARP_A11Y, gtk-sharp-2.0 >= 2.12.10, gtksharp_with_a11y=yes, gtksharp_with_a11y=no)
+		AM_CONDITIONAL(ENABLE_ATK, test "x$gtksharp_with_a11y" = "xyes")
+
+		AM_CONDITIONAL(HAVE_GTK3, false)
+        gtk_version="2"
+	fi
+])
diff --git a/configure.ac b/configure.ac
index d632736..3da7764 100644
--- a/configure.ac
+++ b/configure.ac
@@ -400,6 +400,7 @@ ${PACKAGE}-${VERSION}
     C Compiler:        ${CC}
     Mono C# Compiler:  ${MCS} ${GMCS_FLAGS}
     Mono Runtime:      ${MONO}
+    Gtk#:              ${gtk_version}
 
   Video/Graphics:
     Graphics System:   ${GRAPHICS_SUBSYSTEM}