--- SConstruct.orig	2012-02-08 09:38:50.000000000 +0800
+++ SConstruct	2012-02-08 09:50:13.000000000 +0800
@@ -115,7 +115,7 @@ LIBRARY_FLAGS = {
       'CPPPATH' : [src_dir, '/usr/local/include'],
       'LIBPATH' : ['/usr/local/lib'],
       'CCFLAGS':      ['-ansi'],
-      'LIBS': ['execinfo']
+      'LIBS': ['pthread', 'execinfo']
     },
     'os:openbsd': {
       'CPPPATH' : [src_dir, '/usr/local/include'],
