--- ./Makefile.include.in.orig	2009-07-01 12:16:49.000000000 +0200
+++ ./Makefile.include.in	2009-07-01 12:16:54.000000000 +0200
@@ -32,7 +32,7 @@
 lispdir = @lispdir@
 
 # programs
-CC                = @CC@
+CC                = @CC@ -lm
 RANLIB            = @RANLIB@
 YACC              = @YACC@
 INSTALL           = @INSTALL@
--- ./src/gpm.c.orig	2009-07-01 11:57:03.000000000 +0200
+++ ./src/gpm.c	2009-07-01 11:57:09.000000000 +0200
@@ -21,6 +21,8 @@
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  ********/
 
+#define _GNU_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>        /* strerror(); ?!?  */