--- Makefile.in.orig	2016-10-25 23:43:25 UTC
+++ Makefile.in
@@ -1206,6 +1206,8 @@ uninstall-am: uninstall-pkgconfigDATA
 %.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' $< > $@