make: backout changeset 51f5fae84e43
Support for '!=' was only added in GNU Make 4.0, and CentOS versions as new as
CentOS 7 only carry 3.82.
I will leave figuring out compatibility with BSD make as an exercise for
interested folks.
--- a/Makefile Thu Jan 01 00:00:00 1970 +0000
+++ b/Makefile Mon Apr 25 16:34:02 2016 -0700
@@ -6,7 +6,7 @@
export PREFIX=/usr/local
PYTHON=python
-HGROOT != pwd
+$(eval HGROOT := $(shell pwd))
HGPYTHONS ?= $(HGROOT)/build/pythons
PURE=
PYFILES:=$(shell find mercurial hgext doc -name '*.py')