--- a/configure.ac.old	2011-05-24 08:45:49.197656941 +0200
+++ b/configure.ac	2011-05-24 08:46:13.685193761 +0200
@@ -101,6 +101,7 @@
 AC_CHECK_LIB(GLU, gluNewQuadric, [ LDFLAGS="$LDFLAGS -lGLU" ],
 		[AC_MSG_ERROR([OpenGL libraries not found])
 		])
+LDFLAGS="$LDFLAGS -lm"
 
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT