--- ./configure.in.orig	2012-10-15 14:47:07.000000000 +0000
+++ ./configure.in	2012-12-31 13:28:39.927878053 +0000
@@ -4,13 +4,14 @@
 AM_INIT_AUTOMAKE([galculator], [2.0])
 AM_MAINTAINER_MODE
 
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADER(config.h)
 
 AC_PROG_CC
 AC_PROG_INTLTOOL(, no-xml)
 AC_ISC_POSIX
 
 AC_HEADER_STDC
+AC_CHECK_LIB([m],[tan])
 
 AC_ARG_ENABLE([gtk3],
     [AC_HELP_STRING([--enable-gtk3],