Taken from https://bug1339931.bmoattachments.org/attachment.cgi?id=8837771.

# HG changeset patch
# Parent 4732a0e5d22bc7e5c1f1ace7a182d537d9cc2c6a
Add major version to shell and js-config filenames.
Author: Rico Tzschichholz <ricotz@ubuntu.com>
Forwarded: no
Last-Update: 2014-10-29

---
diff --git a/js/src/configure b/js/src/configure
--- a/js/src/configure
+++ b/js/src/configure
@@ -1696,8 +1696,13 @@
 MOZJS_PATCH_VERSION=`echo $MOZILLA_VERSION | sed "s|^[0-9]*\.[0-9]*[^0-9]*||"`
 IS_ALPHA=`echo $MOZILLA_VERSION | grep '[ab]'`
 
+if test -n "$JS_STANDALONE"; then
+JS_SHELL_NAME=js$MOZJS_MAJOR_VERSION
+JS_CONFIG_NAME=js$MOZJS_MAJOR_VERSION-config
+else
 JS_SHELL_NAME=js
 JS_CONFIG_NAME=js-config
+fi
 
 
 if test -n "$IS_ALPHA"; then

diff --git a/js/src/configure.in b/js/src/configure.in
--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -234,16 +234,13 @@ MOZJS_MINOR_VERSION=`echo $MOZILLA_VERSI
 MOZJS_PATCH_VERSION=`echo $MOZILLA_VERSION | sed "s|^[0-9]*\.[0-9]*[^0-9]*||"`
 IS_ALPHA=`echo $MOZILLA_VERSION | grep '[ab]'`
 
-dnl XXX in a temporary bid to avoid developer anger at renaming files
-dnl XXX before "js" symlinks exist, don't change names.
-dnl
-dnl if test -n "$JS_STANDALONE"; then
-dnl JS_SHELL_NAME=js$MOZJS_MAJOR_VERSION
-dnl JS_CONFIG_NAME=js$MOZJS_MAJOR_VERSION-config
-dnl else
+if test -n "$JS_STANDALONE"; then
+JS_SHELL_NAME=js$MOZJS_MAJOR_VERSION
+JS_CONFIG_NAME=js$MOZJS_MAJOR_VERSION-config
+else
 JS_SHELL_NAME=js
 JS_CONFIG_NAME=js-config
-dnl fi
+fi
 
 changequote([,])
 if test -n "$IS_ALPHA"; then

diff -r 80a9e64d75f5 js/src/Makefile.in
--- a/js/src/Makefile.in        Wed Jun 25 15:11:42 2014 +0200
+++ b/js/src/Makefile.in        Sat Jul 05 14:08:38 2014 +0200
@@ -273,6 +273,9 @@
 SCRIPTS = $(JS_CONFIG_NAME)
 SDK_BINARY = $(JS_CONFIG_NAME)
 
+$(JS_CONFIG_NAME): js-config
+	cp $^ $@
+
 $(JS_LIBRARY_NAME).pc: js.pc
 	cp $^ $@
 
