[gnome-screensaver] Add explicit requirements for libX11 and libm

[Ray Strode <halfline src gnome org>]

commit 3d185db0948930bf1099f1e1ee46c27f80c49eb5
Author: Ray Strode <rstrode redhat com>
Date:   Tue Feb 9 12:25:53 2010 -0500

    Add explicit requirements for libX11 and libm
    
    They are pulled in implicitly, but some linkers
    require them to be explicitly given.

 configure.ac       |    2 ++
 savers/Makefile.am |    1 +
 2 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index af8906d..0d1aa07 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,7 @@ GLIB_REQUIRED_VERSION=2.15.0
 GCONF_REQUIRED_VERSION=2.6.1
 GDK_REQUIRED_VERSION=2.14.0
 GTK_REQUIRED_VERSION=2.11.5
+X11_REQUIRED_VERSION=1.3
 LIBGNOME_MENU_REQUIRED_VERSION=2.11.1
 GNOME_DESKTOP_REQUIRED_VERSION=2.29.0
 
@@ -56,6 +57,7 @@ AC_TYPE_UID_T
 
 AC_CHECK_FUNCS([setresuid setenv unsetenv clearenv])
 PKG_CHECK_MODULES(GNOME_SCREENSAVER,
+        x11 >= $X11_REQUIRED_VERSION
         gtk+-2.0 >= $GTK_REQUIRED_VERSION
         dbus-glib-1 >= $DBUS_REQUIRED_VERSION
         gconf-2.0 >= $GCONF_REQUIRED_VERSION
diff --git a/savers/Makefile.am b/savers/Makefile.am
index dccdfeb..ce8035f 100644
--- a/savers/Makefile.am
+++ b/savers/Makefile.am
@@ -87,6 +87,7 @@ floaters_SOURCES =	\
 floaters_LDADD =		       \
 	libgs-theme-engine.a		\
 	$(GNOME_SCREENSAVER_SAVER_LIBS) \
+	-lm                             \
 	$(NULL)
 
 popsquares_SOURCES = 		\