--- serd-0.18.2.orig/serd.pc.in
+++ serd-0.18.2/serd.pc.in
@@ -6,6 +6,6 @@ includedir=@INCLUDEDIR@
 Name: Serd
 Version: @SERD_VERSION@
 Description: Lightweight RDF syntax library
-Libs: -L${libdir} -l@LIB_SERD@
+Libs: -L${libdir} -l@LIB_SERD@ -lm
 Libs.private: -lm
 Cflags: -I${includedir}/serd-@SERD_MAJOR_VERSION@