[libwnck] build: link against libm

[Vincent Untz <vuntz src gnome org>]

commit 65cc46e43eb683a6dfee1e9b7b4285dd05cd870b
Author: Vincent Untz <vuntz gnome org>
Date:   Wed Aug 31 10:37:28 2011 +0200

    build: link against libm

 configure.ac        |    3 +++
 libwnck/Makefile.am |    3 ++-
 2 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9d89e87..45ef915 100644
--- a/configure.ac
+++ b/configure.ac
@@ -74,6 +74,9 @@ AC_SUBST(wncklocaledir)
 
 AC_PATH_PROG(PKG_CONFIG, pkg-config)
 
+AC_CHECK_LIBM
+AC_SUBST(LIBM)
+
 AC_ARG_ENABLE(startup-notification,
               [AC_HELP_STRING([--enable-startup-notification],
                               [startup notification library @<:@default=auto@:>@])],,
diff --git a/libwnck/Makefile.am b/libwnck/Makefile.am
index 8f53ddd..30860d9 100644
--- a/libwnck/Makefile.am
+++ b/libwnck/Makefile.am
@@ -85,7 +85,8 @@ libwnck_3_la_CPPFLAGS =			\
 
 libwnck_3_la_LIBADD =	\
 	$(LIBWNCK_LIBS)	\
-	$(XLIB_LIBS)
+	$(XLIB_LIBS)	\
+	$(LIBM)
 
 libwnck_3_la_LDFLAGS =								\
 	-version-info $(LIBWNCK_CURRENT):$(LIBWNCK_REVISION):$(LIBWNCK_AGE)	\