--- agg-2.5.orig/configure.in	2006-10-09 00:06:36.000000000 -0400
+++ agg-2.5/configure.in	2009-12-10 20:21:30.410763640 -0500
@@ -36,6 +36,9 @@
 fi
 AM_CONDITIONAL(ENABLE_CTRL,test x$enable_ctrl != xno)
 
+# check if math library is required
+AC_SEARCH_LIBS(atan2, m)
+
 # used as platform library in examples:
 # todo, make the PREFERED_PLATFORM selectable, after the set of possible 
 # Platforms to link the examples have been evaluated.