add pkgconfig files

--HG--
branch : HEAD
diff --git a/Makefile.am b/Makefile.am
index 22b9ab4..4008343 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1 +1,7 @@
 SUBDIRS=lib src regress
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libzip.pc
+
+EXTRA_DIST=	libzip.pc.in \
+		libzip-uninstalled.pc.in