if HAVE_MHD
if ENABLE_TEST_RUN
-TESTS_ENVIRONMENT=export GNUNET_PREFIX=@libdir@;export PATH=@prefix@/bin:$$PATH;
+AM_TESTS_ENVIRONMENT=export GNUNET_PREFIX=$${GNUNET_PREFIX:-@libdir@};export PATH=$${GNUNET_PREFIX:-@prefix@}/bin:$$PATH;
TESTS = \
$(check_SCRIPTS)
endif