#
# Add pkgconfig files for those inclined to use it during a build.
#
diff -ruN gmp-6.1.1.orig/libgmp.in gmp-6.1.1/libgmp.in
--- gmp-6.1.1.orig/libgmp.in	1969-12-31 18:00:00.000000000 +0000
+++ gmp-6.1.1/libgmp.in	2016-11-21 17:16:23.456171594 +0000
@@ -0,0 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+sharedlibdir=@sharedlibdir@
+includedir=@includedir@
+
+Name: libgmp
+Description: The GNU Multiple Precision Bignum Library
+Version: @VERSION@
+
+Requires:
+Libs: -L${libdir} -lgmp
+Cflags: -I${includedir}
diff -ruN gmp-6.1.1.orig/libgmpxx.in gmp-6.1.1/libgmpxx.in
--- gmp-6.1.1.orig/libgmpxx.in	1969-12-31 18:00:00.000000000 +0000
+++ gmp-6.1.1/libgmpxx.in	2016-11-21 17:16:23.456406624 +0000
@@ -0,0 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+sharedlibdir=@sharedlibdir@
+includedir=@includedir@
+
+Name: libgmpxx
+Description: The GNU Multiple Precision Bignum Library
+Version: @VERSION@
+
+Requires:
+Libs: -L${libdir} -lgmp -lgmpxx
+Cflags: -I${includedir}
diff -ruN gmp-6.1.1.orig/Makefile.am gmp-6.1.1/Makefile.am
--- gmp-6.1.1.orig/Makefile.am	2016-06-18 15:00:00.000000000 +0000
+++ gmp-6.1.1/Makefile.am	2016-11-21 17:17:01.968327092 +0000
@@ -297,6 +297,31 @@
 libgmpxx_la_LDFLAGS = $(GMP_LDFLAGS) $(LIBGMPXX_LDFLAGS) \
   -version-info $(LIBGMPXX_LT_CURRENT):$(LIBGMPXX_LT_REVISION):$(LIBGMPXX_LT_AGE)
 
+## pkg-config
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libgmp.pc
+EXTRA_DIR = libgmp.in
+
+if WANT_CXX
+pkgconfig_DATA += libgmpxx.pc
+EXTRA_DIR += libgmpxx.in
+endif
+
+pc_verbose = $(pc_verbose_@AM_V@)
+pc_verbose_ = $(pc_verbose_@AM_DEFAULT_V@)
+pc_verbose_0 = @echo "  PC      " $@;
+
+SUFFIXES = .in.pc
+
+.in.pc:
+	$(AM_V_at)rm -f $@
+	$(pc_verbose)sed \
+		-e 's,@prefix[@],$(prefix),g' \
+		-e 's,@exec_prefix[@],$(exec_prefix),g' \
+		-e 's,@libdir[@],$(libdir),g' \
+		-e 's,@includedir[@],$(includedir),g' \
+		-e 's,@VERSION[@],$(VERSION),g' \
+		< $< > $@ || { rm -f $@; exit 1; }
 
 
 install-data-hook: