Install some pkgconfig files

src/libstore/local.mk

@@ -30,3 +30,5 @@ $(d)/local-store.cc: $(d)/schema.sql.hh
 	$(trace-gen) sed -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/' < $< > $@ || (rm $@ && exit 1)
 
 clean-files += $(d)/schema.sql.hh
+
+$(eval $(call install-file-in, $(d)/nix-store.pc, $(libdir)/pkgconfig, 0644))

src/libstore/nix-store.pc.in

@@ -0,0 +1,9 @@
+prefix=@prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: Nix
+Description: Nix Package Manager
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -lnixstore -lnixutil -lnixformat
+Cflags: -I${includedir}/nix