Add pkg-config definition for libmctp

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Change-Id: I276caf181d398d1b4a217f2ff59e5e7d31b47b6a
diff --git a/configure.ac b/configure.ac
index a33d1b8..82d9737 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,6 +15,10 @@
 # libtool init
 LT_INIT
 
+# pkg-config
+PKG_PROG_PKG_CONFIG
+PKG_INSTALLDIR
+
 # Set defaults for standard library compiles. We may want to
 # AC_ARG_WITH these in the future.
 AC_DEFINE([MCTP_HAVE_SYSLOG], [1], [Define to enable syslog])
@@ -26,5 +30,5 @@
 AM_CONDITIONAL([LIBMCTP_BINDING_serial], [true])
 AM_CONDITIONAL([LIBMCTP_BINDING_astlpc], [true])
 
-AC_CONFIG_FILES([Makefile])
+AC_CONFIG_FILES([Makefile libmctp.pc])
 AC_OUTPUT