--- a/build/unix/build-clang/build-clang.py
+++ b/build/unix/build-clang/build-clang.py
@@ -6,16 +6,18 @@
 import os
 import os.path
 import shutil
 import subprocess
 import platform
 import json
 import argparse
 
+centOS6 = False
+
 
 def check_run(args):
     r = subprocess.call(args)
     assert r == 0
 
 
 def run_in(path, args):
     d = os.getcwd()
@@ -89,21 +91,27 @@ def build_one_stage_aux(stage_dir, llvm_
     targets = ["x86", "x86_64"]
     # The Darwin equivalents of binutils appear to have intermittent problems
     # with objects in compiler-rt that are compiled for arm.  Since the arm
     # support is only necessary for iOS (which we don't support), only enable
     # arm support on Linux.
     if not is_darwin():
         targets.append("arm")
 
+    global centOS6
+    if centOS6:
+        python_path = "/usr/bin/python2.7"
+    else:
+        python_path = "/usr/local/bin/python2.7"
+
     configure_opts = ["--enable-optimized",
                       "--enable-targets=" + ",".join(targets),
                       "--disable-assertions",
                       "--disable-libedit",
-                      "--with-python=/usr/local/bin/python2.7",
+                      "--with-python=%s" % python_path,
                       "--prefix=%s" % inst_dir,
                       "--with-gcc-toolchain=%s" % gcc_toolchain_dir,
                       "--disable-compiler-version-checks"]
     build_package(llvm_source_dir, build_dir, configure_opts, [])
 
 if __name__ == "__main__":
     # The directories end up in the debug info, so the easy way of getting
     # a reproducible build is to run it in a know absolute directory.
@@ -114,17 +122,21 @@ if __name__ == "__main__":
     source_dir = base_dir + "/src"
     build_dir = base_dir + "/build"
 
     llvm_source_dir = source_dir + "/llvm"
     clang_source_dir = source_dir + "/clang"
     compiler_rt_source_dir = source_dir + "/compiler-rt"
     libcxx_source_dir = source_dir + "/libcxx"
 
-    gcc_dir = "/tools/gcc-4.7.3-0moz1"
+    global centOS6
+    if centOS6:
+        gcc_dir = "/home/worker/workspace/build/src/gcc"
+    else:
+        gcc_dir = "/tools/gcc-4.7.3-0moz1"
 
     if is_darwin():
         os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.7'
 
     parser = argparse.ArgumentParser()
     parser.add_argument('-c', '--config', required=True,
                         type=argparse.FileType('r'),
                         help="Clang configuration file")