From a861a033bf8c695d9ac498b60849c366c60e1895 Mon Sep 17 00:00:00 2001
From: Peifeng Yu <peifeng@umich.edu>
Date: Mon, 23 Jul 2018 15:17:16 -0400
Subject: [PATCH] Update autogen.sh to support out-of-source build

---
 .gitignore |  1 +
 autogen.sh | 17 +++++++++++++----
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 717dac7..7bca30e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ Makefile.in
 aclocal.m4
 autom4te.cache/
 build-aux/
+build/
 config.h
 config.h.in
 config.h.in~
diff --git a/autogen.sh b/autogen.sh
index 0bb5ca8..65a6fe1 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,8 +1,17 @@
 #!/bin/sh
 set -e
-mkdir -p m4
-autoreconf -i
 
-if test ! "x$NOCONFIGURE" = "x1" ; then
-    exec ./configure "$@"
+srcdir=`dirname $0`
+test -z "$srcdir" && srcdir=.
+
+origdir=`pwd`
+cd $srcdir
+
+mkdir -p m4
+autoreconf -is --force
+
+cd $origdir
+
+if test -z "$NOCONFIGURE" ; then
+    exec $srcdir/configure "$@"
 fi