-ifdef TRAVIS
-prefix ?= $(HOME)/build/php-$(PHP)-$(shell env |grep -E '^with_|^enable_' | tr -c '[a-zA-Z_]' -)
-else
-prefix ?= $(TMPDIR)/php-$(PHP)-$(shell env |grep -E '^with_|^enable_' | tr -c '[a-zA-Z_]' -)
+ifeq (,$(findstring printenv,$(MAKECMDGOALS)))
+mkargs := $(shell $(MAKE) -f $(mkfile) printenv | sed -n -e '/=no$$/ d; s/=yes$$//' -e 's,with_,,gp' -e 's,enable_,,gp' | tr -c '[a-zA-Z_]' -)