--- cfitsio/Makefile.in.orig	2006-10-12 23:14:41.000000000 +0200
+++ cfitsio/Makefile.in	2006-12-11 23:33:23.384139444 +0100
@@ -87,7 +87,7 @@
 shared: libcfitsio${SHLIB_SUFFIX}
 
 libcfitsio${SHLIB_SUFFIX}: ${OBJECTS}
-		${SHLIB_LD} -o $@ ${OBJECTS}
+		${SHLIB_LD} -o $@ ${OBJECTS} -lm
 
 install:	libcfitsio.a $(INSTALL_DIRS)
 		@if [ -f libcfitsio.a ]; then \