[buddy] install a pkg-config file

* src/libbddx.pc.in: New file.
* src/Makefile.am: Generate libbddx.pc, and install it.
Distribute libbddx.pc.in.
* src/.gitignore: Ignore *.pc.

buddy/src/.gitignore

@@ -5,4 +5,4 @@
 Makefile.in
 Makefile
 bddtest
-
+*.pc

buddy/src/Makefile.am

@@ -30,3 +30,18 @@ check_PROGRAMS = bddtest
 bddtest_SOURCES = bddtest.cxx
 bddtest_CPPFLAGS = -I$(top_builddir)
 bddtest_LDADD = ./libbddx.la
+
+
+EXTRA_DIST = $(srcdir)/libbddx.pc.in
+pkgconfigdir = $(libdir)/pkgconfig
+nodist_pkgconfig_DATA = libbddx.pc
+
+libbddx.pc: $(srcdir)/libbddx.pc.in
+	sed -e 's![@]prefix[@]!$(prefix)!g' \
+	    -e 's![@]exec_prefix[@]!$(exec_prefix)!g' \
+	    -e 's![@]includedir[@]!$(includedir)!g' \
+	    -e 's![@]libdir[@]!$(libdir)!g' \
+	    -e 's![@]PACKAGE_VERSION[@]!$(PACKAGE_VERSION)!g' \
+	$(srcdir)/libbddx.pc.in > $@
+
+DISTCLEANFILES = libbddx.pc

buddy/src/libbddx.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+includedir=@includedir@
+libdir=@libdir@
+
+Name: BuDDyX
+Description: A BDD library (fork of BuDDy for use with Spot)
+URL: https://spot.lrde.epita.fr/
+Version: @PACKAGE_VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -lbddx