diff -up librsvg-2.26.0/Makefile.am.libs librsvg-2.26.0/Makefile.am
diff -up librsvg-2.26.0/tests/pdiff/Makefile.am.libs librsvg-2.26.0/tests/pdiff/Makefile.am
--- librsvg-2.26.0/tests/pdiff/Makefile.am.libs	2010-02-14 14:09:53.701154808 -0500
+++ librsvg-2.26.0/tests/pdiff/Makefile.am	2010-02-14 14:10:08.450903872 -0500
@@ -13,4 +13,4 @@ perceptualdiff_SOURCES =	\
 	perceptualdiff.c
 
 INCLUDES = $(LIBRSVG_CFLAGS)
-LDADD = libpdiff.la $(LIBRSVG_LIBS)
+LDADD = libpdiff.la $(LIBRSVG_LIBS) -lm