export
-PHP = 5.6
+PHP ?= 5.6
JOBS ?= 2
PHP_MIRROR ?= http://us1.php.net/distributions/
-prefix ?= $(HOME)
-prefix += /job-$(TRAVIS_JOB_NUMBER)
+prefix ?= $(HOME)/job-$(TRAVIS_JOB_NUMBER)
exec_prefix ?= $(prefix)
bindir = $(exec_prefix)/bin
srcdir := $(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))