FreeBSD patches to gyp, see also http://codereview.chromium.org/172032.

pylib/gyp/__init__.py

 #!/usr/bin/python
 
 import copy
 import gyp.input
 import optparse
 import os.path
 import re
 import shlex
 import sys
 
@@ skipping 53 matching lines @@
     'generator_handles_variants':
         getattr(generator, 'generator_handles_variants', False),
     'non_configuration_keys':
         getattr(generator, 'generator_additional_non_configuration_keys', []),
     'path_sections':
         getattr(generator, 'generator_additional_path_sections', []),
     'extra_sources_for_rules':
         getattr(generator, 'generator_extra_sources_for_rules', []),
   }
 
+  print "OS =",default_variables['OS']
+
   # Process the input specific to this generator.
   result = gyp.input.Load(build_files, default_variables, includes[:],
                           depth, generator_input_info)
   return [generator] + result
 
 def NameValueListToDict(name_value_list):
   """
   Takes an array of strings of the form 'NAME=VALUE' and creates a dictionary
   of the pairs.  If a string is simply NAME, then the value in the dictionary
   is set to True.  If VALUE can be converted to an integer, it is.
@@ skipping 76 matching lines @@
     generate_formats = os.environ.get('GYP_GENERATORS', [])
     if generate_formats:
       generate_formats = re.split('[\s,]', generate_formats)
     if generate_formats:
       options.formats = generate_formats
     else:
       # Nothing in the variable, default based on platform.
       options.formats = [ {'darwin':   'xcode',
                            'win32':    'msvs',
                            'cygwin':   'msvs',
+                           'freebsd6': 'make',
                            'freebsd7': 'make',
                            'freebsd8': 'make',
                            'linux2':   'scons',}[sys.platform] ]
 
   if not build_files:
     build_files = FindBuildFiles()
   if not build_files:
     print >>sys.stderr, (usage + '\n\n%s: error: no build_file') % \
                         (my_name, my_name)
     return 1
@@ skipping 90 matching lines @@
     # need to have dependencies defined before dependents reference them should
     # generate targets in the order specified in flat_list.
     generator.GenerateOutput(flat_list, targets, data, params)
 
   # Done
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))