diff -r 000000000000 -r 6474c204b198 build/autoconf/mozprog.m4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/autoconf/mozprog.m4	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+dnl This Source Code Form is subject to the terms of the Mozilla Public
+dnl License, v. 2.0. If a copy of the MPL was not distributed with this
+dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+AC_DEFUN([MOZ_PROG_CHECKMSYS],
+[AC_REQUIRE([AC_INIT_BINSH])dnl
+if test `uname -s | grep -c MINGW 2>/dev/null` != "0"; then
+  msyshost=1
+fi
+])
+
+AC_DEFUN([MOZ_PATH_PROG],
+[ AC_PATH_PROG($1,$2,$3,$4)
+  if test "$msyshost"; then
+    case "[$]$1" in
+    /*)
+      tmp_DIRNAME=`dirname "[$]$1"`
+      tmp_BASENAME=`basename "[$]$1"`
+      tmp_PWD=`cd "$tmp_DIRNAME" && pwd -W`
+      $1="$tmp_PWD/$tmp_BASENAME"
+      if test -e "[$]$1.exe"; then
+        $1="[$]$1.exe"
+      fi
+    esac
+  fi
+])
+
+AC_DEFUN([MOZ_PATH_PROGS],
+[  AC_PATH_PROGS($1,$2,$3,$4)
+  if test "$msyshost"; then
+    case "[$]$1" in
+    /*)
+      tmp_DIRNAME=`dirname "[$]$1"`
+      tmp_BASENAME=`basename "[$]$1"`
+      tmp_PWD=`cd "$tmp_DIRNAME" && pwd -W`
+      $1="$tmp_PWD/$tmp_BASENAME"
+      if test -e "[$]$1.exe"; then
+        $1="[$]$1.exe"
+      fi
+    esac
+  fi
+])