--- a/configure.in
+++ b/configure.in
@@ -17,6 +17,7 @@
 PKG_CHECK_MODULES(GTK, [$pkg_modules])
 AC_SUBST(GTK_CFLAGS)
 AC_SUBST(GTK_LIBS)
+AC_SEARCH_LIBS(ceil, m)
 
 
 dnl From glade-2 generated configure.in