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diff --git a/20150505/unit-tests/export-env.mk b/20150505/unit-tests/export-env.mk
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+# $Id: export-env.mk,v 1.1.1.1 2014/08/30 18:57:18 sjg Exp $
+
+# our normal .export, subsequent changes affect the environment
+UT_TEST=this
+.export UT_TEST
+UT_TEST:= ${.PARSEFILE}
+
+# not so with .export-env
+UT_ENV=exported
+.export-env UT_ENV
+UT_ENV=not-exported
+
+# gmake style export goes further; affects nothing but the environment
+UT_EXP=before-export
+export UT_EXP=exported
+UT_EXP=not-exported
+
+all:
+ @echo make:; ${UT_TEST UT_ENV UT_EXP:L:@v@echo $v=${$v};@}
+ @echo env:; ${UT_TEST UT_ENV UT_EXP:L:@v@echo $v=$${$v};@}
+
+
+
+
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