[f-spot] Use AC_ARG_WITH optional args for g-ss detection

[Stephane Delcroix <sdelcroix src gnome org>]

commit b7272ab72076d915983f86f9169f749c70a0824d
Author: Loïc Minier <lool dooz org>
Date:   Wed Sep 2 10:58:34 2009 +0200

    Use AC_ARG_WITH optional args for g-ss detection
    
    Use nicer AC_ARG_WITH syntax with optional args to set the
    gnome-screensaver prefix.
    
    Signed-off-by: Stephane Delcroix <stephane delcroix org>

 configure.ac |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 8fd5a4c..7507f29 100644
--- a/configure.ac
+++ b/configure.ac
@@ -224,13 +224,10 @@ if test "x$with_turtle" != "xno"; then
    AC_SUBST(TURTLEDIR)
 fi
 
-AC_ARG_WITH(gnome-screensaver,[ --with-gnome-screensaver=PREFIX  set gnome gnome-screensaver prefix])
-
-if test "x$with_gnome_screensaver" != "x"; then
-	gnome_screensaver_prefix=$with_gnome_screensaver
-else
-	gnome_screensaver_prefix=$prefix		   
-fi
+AC_ARG_WITH(gnome-screensaver,
+    [ --with-gnome-screensaver=PREFIX  set gnome gnome-screensaver prefix],
+    gnome_screensaver_prefix=$with_gnome_screensaver,
+    gnome_screensaver_prefix=$prefix)
 
 PKG_CHECK_EXISTS(gnome-screensaver, have_gs_pkgconfig=yes, have_gs_pkgconfig=no)
 if test "$have_gs_pkgconfig" = "yes"; then