diff -ur cfitsio/Makefile.in cfitsio.new/Makefile.in
--- cfitsio/Makefile.in	2011-10-29 16:54:43.077132582 +0200
+++ cfitsio.new/Makefile.in	2011-10-29 16:55:38.648098260 +0200
@@ -90,7 +90,7 @@
 shared: libcfitsio${SHLIB_SUFFIX}
 
 libcfitsio${SHLIB_SUFFIX}: ${OBJECTS}
-		${SHLIB_LD} ${LDFLAGS} -o $@ ${OBJECTS}
+		${SHLIB_LD} ${LDFLAGS} ${LIBS} -lm -o $@ ${OBJECTS}
 
 install:	libcfitsio.a $(INSTALL_DIRS)
 		@if [ -f libcfitsio.a ]; then \