Index: tiff-4.0.10/libtiff-4.pc.in
===================================================================
--- tiff-4.0.10.orig/libtiff-4.pc.in
+++ tiff-4.0.10/libtiff-4.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: libtiff
 Description:  Tag Image File Format (TIFF) library.
 Version: @VERSION@
-Libs: -L${libdir} -ltiff
+Libs: -L${libdir} -ltiff -lm
 Libs.private: @tiff_libs_private@
 Cflags: -I${includedir}
