Index: build/common.gypi
--- build/common.gypi.orig
+++ build/common.gypi
@@ -100,7 +100,7 @@
 
     'v8_use_snapshot%': 'true',
     'host_os%': '<(OS)',
-    'werror%': '-Werror',
+    'werror%': '',
 
     # With post mortem support enabled, metadata is embedded into libv8 that
     # describes various parameters of the VM for use by debuggers. See
@@ -338,6 +338,9 @@
       }],
       ['OS=="freebsd" or OS=="openbsd"', {
         'cflags': [ '-I/usr/local/include' ],
+         'libraries': [                                            
+            '-L/usr/local/lib -lexecinfo',
+          ]
       }],
       ['OS=="netbsd"', {
         'cflags': [ '-I/usr/pkg/include' ],