Add pkg-config file

We're installing header file pcuif_proto.h so it's better to use
pkg-config for proper version tracking similar to the way it's done for
OpenBSC.

Change-Id: I0520045e5655794df152b98b9755d7cbbd334049

.gitignore

@@ -58,3 +58,5 @@ debian/osmo-pcu-dbg/
 debian/osmo-pcu.substvars
 debian/osmo-pcu/
 debian/tmp/
+
+osmo-pcu.pc

Makefile.am

@@ -3,3 +3,5 @@ AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
 SUBDIRS = include src examples tests
 EXTRA_DIST = osmoappdesc.py
 
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = osmo-pcu.pc

configure.ac

@@ -83,6 +83,7 @@ STD_DEFINES_AND_INCLUDES="-Wall"
 AC_SUBST(STD_DEFINES_AND_INCLUDES)
 
 AC_OUTPUT(
+    osmo-pcu.pc
     include/Makefile
     src/Makefile
     examples/Makefile

debian/osmo-pcu.install

@@ -1,3 +1,4 @@
 etc/osmocom/osmo-pcu.cfg
 usr/bin/osmo-pcu
 usr/include/osmocom/pcu/pcuif_proto.h
+usr/lib/pkgconfig/osmo-pcu.pc

osmo-pcu.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@/
+
+Name: OsmoPCU
+Description: Osmocom PCU implementation
+Requires:
+Version: @VERSION@
+Cflags: -I${includedir}