$NetBSD: patch-solenv_gbuild_ExternalProject.mk,v 1.1 2015/03/12 02:59:04 ryoon Exp $

--- solenv/gbuild/ExternalProject.mk.orig	2015-02-20 17:33:24.000000000 +0000
+++ solenv/gbuild/ExternalProject.mk
@@ -212,7 +212,7 @@ define gb_ExternalProject_run
 $(if $(findstring YES,$(UNPACKED_IS_BIN_TARBALL)),\
 	touch $@,
 $(call gb_Helper_print_on_error,cd $(EXTERNAL_WORKDIR)/$(3) && \
-	unset Platform && \
+	(unset Platform || true)&& \
 	$(if $(WRAPPERS),export $(WRAPPERS) &&) \
 	$(if $(NMAKE),INCLUDE="$(gb_ExternalProject_INCLUDE)" LIB="$(ILIB)" MAKEFLAGS=) \
 	$(2) && touch $@,$(EXTERNAL_WORKDIR)/$(if $(3),$(3)/,)$(if $(4),$(4),$(1).log))