- workaround for https://github.com/aykutbulut/OsiIpopt/issues/1

--- Makefile.in.orig	2021-05-12 17:04:21 UTC
+++ Makefile.in
@@ -788,7 +788,7 @@ uninstall-info: uninstall-info-recursive
 
 install-data-hook:
 	@$(mkdir_p) "$(addlibsdir)"
-@COIN_HAS_PKGCONFIG_TRUE@	PKG_CONFIG_PATH=@COIN_PKG_CONFIG_PATH@ \
+@COIN_HAS_PKGCONFIG_TRUE@	PKG_CONFIG_PATH=@COIN_PKG_CONFIG_PATH@:$(FREEBSD_STAGEDIR)$(PREFIX)/lib/pkgconfig \
 @COIN_HAS_PKGCONFIG_TRUE@	$(PKG_CONFIG) --libs osiipopt > $(addlibsdir)/osiipopt_addlibs.txt
 @COIN_CXX_IS_CL_TRUE@@COIN_HAS_PKGCONFIG_FALSE@	echo "-libpath:`$(CYGPATH_W) @abs_lib_dir@` libOsiIpopt.lib @OSIIPOPTLIB_LIBS_INSTALLED@" > $(addlibsdir)/osiipopt_addlibs.txt
 @COIN_CXX_IS_CL_FALSE@@COIN_HAS_PKGCONFIG_FALSE@	echo -L@abs_lib_dir@ -lOsiIpopt @OSIIPOPTLIB_LIBS_INSTALLED@ > $(addlibsdir)/osiipopt_addlibs.txt