--- Makefile.in.orig	2011-03-13 18:12:06.000000000 +0100
+++ Makefile.in	2011-03-13 18:14:22.000000000 +0100
@@ -1179,6 +1179,8 @@
 %.pc: %.pc.in
 	$(AM_V_GEN)sed -e 's,@prefix\@,$(prefix),g' \
 	    -e 's,@libdir\@,$(libdir),g' \
+	    -e 's,@PTHREAD_CFLAGS\@,$(PTHREAD_CFLAGS),g' \
+	    -e 's,@PTHREAD_LIBS\@,$(PTHREAD_LIBS),g' \
 	    -e 's,@HOWL_COMPAT_VERSION\@,$(HOWL_COMPAT_VERSION),g' \
 	    -e 's,@PACKAGE_VERSION\@,$(PACKAGE_VERSION),g' $< > $@