[PATCH STABLE] make: backout changeset 51f5fae84e43

[Siddharth Agarwal]

# HG changeset patch
# User Siddharth Agarwal <sid0 at fb.com>
# Date 1461627242 25200
#      Mon Apr 25 16:34:02 2016 -0700
# Branch stable
# Node ID a62e1dbb9f9d52fd00024e4632d88c0fbccd1d3c
# Parent  38292b227debf6393dc1e2c6ff886f85f6673646
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.

diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -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')