diff --git a/js/config.mk b/js/config.mk
index ddd96ed..8e26fdf 100644
--- a/js/config.mk
+++ b/js/config.mk
@@ -103,11 +103,23 @@ else
 ifeq ($(OS_ARCH),Darwin64)
 OS_CONFIG       := Darwin64
 else
+ifeq ($(OS_ARCH),FreeBSD)
+OS_CONFIG       := BSD
+else
+ifeq ($(OS_ARCH),OpenBSD)
+OS_CONFIG       := BSD
+else
+ifeq ($(OS_ARCH),NetBSD)
+OS_CONFIG       := BSD
+else
 OS_CONFIG       := $(OS_ARCH)$(OS_OBJTYPE)$(OS_RELEASE)
 endif
 endif
 endif
 endif
+endif
+endif
+endif
 
 ASFLAGS         =
 DEFINES         =
diff --git a/js/ref-config/BSD.mk b/js/ref-config/BSD.mk
new file mode 100644
index 0000000..9f5884f
--- /dev/null
+++ b/js/ref-config/BSD.mk
@@ -0,0 +1,84 @@
+# -*- Mode: makefile -*-
+#
+# ***** BEGIN LICENSE BLOCK *****
+# Version: MPL 1.1/GPL 2.0/LGPL 2.1
+#
+# The contents of this file are subject to the Mozilla Public License Version
+# 1.1 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+# http://www.mozilla.org/MPL/
+#
+# Software distributed under the License is distributed on an "AS IS" basis,
+# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+# for the specific language governing rights and limitations under the
+# License.
+#
+# The Original Code is Mozilla Communicator client code, released
+# March 31, 1998.
+#
+# The Initial Developer of the Original Code is
+# Netscape Communications Corporation.
+# Portions created by the Initial Developer are Copyright (C) 1998
+# the Initial Developer. All Rights Reserved.
+#
+# Contributor(s):
+#   Steve Zellers (zellers@apple.com)
+#
+# Alternatively, the contents of this file may be used under the terms of
+# either the GNU General Public License Version 2 or later (the "GPL"), or
+# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+# in which case the provisions of the GPL or the LGPL are applicable instead
+# of those above. If you wish to allow use of your version of this file only
+# under the terms of either the GPL or the LGPL, and not to allow others to
+# use your version of this file under the terms of the MPL, indicate your
+# decision by deleting the provisions above and replace them with the notice
+# and other provisions required by the GPL or the LGPL. If you do not delete
+# the provisions above, a recipient may use your version of this file under
+# the terms of any one of the MPL, the GPL or the LGPL.
+#
+# ***** END LICENSE BLOCK *****
+
+#
+# Config for Mac OS X as of PR3
+# Just ripped from Linux config
+#
+
+CC = gcc
+CCC = g++
+CFLAGS +=  -Wall -Wno-format -MMD
+OS_CFLAGS = -DXP_UNIX -DSVR4 -DSYSV -D_BSD_SOURCE -DPOSIX_SOURCE
+RANLIB = ranlib
+MKSHLIB = $(CCC) -shared $(XMKSHLIBOPTS)
+
+SO_SUFFIX = so
+
+#.c.o:
+#      $(CC) -c -MD $*.d $(CFLAGS) $<
+
+CPU_ARCH = $(shell uname -m)
+ifeq (86,$(findstring 86,$(CPU_ARCH)))
+CPU_ARCH = x86
+OS_CFLAGS+= -DX86_LINUX
+OS_CFLAGS += -DAVMPLUS_IA32
+NANOJIT_ARCH = i386
+endif
+GFX_ARCH = x
+
+OS_LIBS = -lc
+
+ASFLAGS += -x assembler-with-cpp
+
+ifeq ($(CPU_ARCH),alpha)
+
+# Ask the C compiler on alpha linux to let us work with denormalized
+# double values, which are required by the ECMA spec.
+
+OS_CFLAGS += -mieee
+endif
+
+# Use the editline library to provide line-editing support.
+JS_EDITLINE = 1
+
+# Don't allow Makefile.ref to use libmath
+NO_LIBM = 1
+