Add pkg-config support

.gitignore

@@ -8,6 +8,7 @@ doc/fix-qdf.1
 doc/qpdf.1
 doc/zlib-flate.1
 examples/build/
+libqpdf.pc
 libqpdf/build/
 libqpdf/qpdf/qpdf-config.h
 libqpdf/qpdf/qpdf-config.h.in

Makefile

@@ -96,6 +96,7 @@ distclean: clean
 	$(RM) manual/html.xsl
 	$(RM) manual/print.xsl
 	$(RM) doc/*.1
+	$(RM) libqpdf.pc
 
 maintainer-clean: distclean
 	$(RM) configure doc/qpdf-manual.* libqpdf/qpdf/qpdf-config.h.in

configure.ac

@@ -7,6 +7,7 @@ AC_INIT([qpdf],[2.3.1])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_FILES([autoconf.mk])
 AC_CONFIG_FILES([manual/html.xsl manual/print.xsl])
+AC_CONFIG_FILES([libqpdf.pc])
 AC_CONFIG_HEADERS([libqpdf/qpdf/qpdf-config.h])
 
 AC_PROG_CC

libqpdf.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libqpdf
+Description: PDF transformation library
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -lqpdf
+Cflags: -I${includedir}

make/libtool.mk

@@ -103,7 +103,7 @@ endef
 # Install target
 
 install: all
-	./mkinstalldirs $(DESTDIR)$(libdir)
+	./mkinstalldirs $(DESTDIR)$(libdir)/pkgconfig
 	./mkinstalldirs $(DESTDIR)$(bindir)
 	./mkinstalldirs $(DESTDIR)$(includedir)/qpdf
 	./mkinstalldirs $(DESTDIR)$(docdir)
@@ -126,3 +126,4 @@ install: all
 	cp doc/qpdf-manual.html $(DESTDIR)$(docdir)
 	cp doc/qpdf-manual.pdf $(DESTDIR)$(docdir)
 	cp doc/*.1 $(DESTDIR)$(mandir)/man1
+	cp libqpdf.pc $(DESTDIR)$(libdir)/pkgconfig