[file-roller] Make it possible to build against GTK+ 3

[Paolo Bacchilega <paobac src gnome org>]

commit 9c3cb8031746c0af5868f2c5de929c6aef7dd83d
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri Jul 16 23:19:32 2010 +0200

    Make it possible to build against GTK+ 3
    
    Based on the patch by Frédéric Péters.  Removed the gconf check
    as well.
    
    [bug #624564]

 configure.ac |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 727c895..0be69ca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,10 +27,27 @@ dnl ==========================================================================
 
 GLIB_REQUIRED=2.25.5
 GIO_REQUIRED=2.25.5
-GTK_REQUIRED=2.19.7
-GCONF_REQUIRED=2.6.0
 NAUTILUS_REQUIRED=2.22.2
 
+AC_MSG_CHECKING([which gtk+ version to compile against])
+AC_ARG_WITH([gtk],
+  [AS_HELP_STRING([--with-gtk=2.0|3.0],[which gtk+ version to compile against (default: 2.0)])],
+  [case "$with_gtk" in
+     2.0|3.0) ;;
+     *) AC_MSG_ERROR([invalid gtk version specified]) ;;
+   esac],
+  [with_gtk=2.0])
+AC_MSG_RESULT([$with_gtk])
+
+case "$with_gtk" in
+  2.0) GTK_API_VERSION=2.0
+       GTK_REQUIRED=2.21.4
+       ;;
+  3.0) GTK_API_VERSION=3.0
+       GTK_REQUIRED=2.90.0
+       ;;
+esac
+
 AC_SUBST(GLIB_REQUIRED)
 AC_SUBST(GIO_REQUIRED)
 AC_SUBST(GTK_REQUIRED)
@@ -38,7 +55,7 @@ AC_SUBST(NAUTILUS_REQUIRED)
 
 dnl ===========================================================================
 
-PKG_CHECK_MODULES(GTK, [gtk+-2.0 >= $GTK_REQUIRED])
+PKG_CHECK_MODULES(GTK, [gtk+-$GTK_API_VERSION >= $GTK_REQUIRED])
 AC_SUBST([GTK_CFLAGS])
 AC_SUBST([GTK_LIBS])
 
@@ -60,8 +77,7 @@ PKG_CHECK_MODULES(FR,					\
 	glib-2.0 >= $GLIB_REQUIRED			\
 	gthread-2.0					\
 	gio-unix-2.0 >= $GIO_REQUIRED			\
-	gtk+-2.0 >= $GTK_REQUIRED			\
-	gconf-2.0 >= $GCONF_REQUIRED)
+	gtk+-$GTK_API_VERSION >= $GTK_REQUIRED)
 AC_SUBST(FR_CFLAGS)
 AC_SUBST(FR_LIBS)