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

pylib/gyp/generator/make.py

 #!/usr/bin/python
 
 # Notes:
 #
 # This is all roughly based on the Makefile system used by the Linux
 # kernel, but is a non-recursive make -- we put the entire dependency
 # graph in front of make and let it figure it out.
 #
 # The code below generates a separate .mk file for each target, but
 # all are sourced by the top-level Makefile.  This means that all
@@ skipping 14 matching lines @@
 import gyp.common
 import os.path
 
 # Debugging-related imports -- remove me once we're solid.
 import code
 import pprint
 
 generator_default_variables = {
   'EXECUTABLE_PREFIX': '',
   'EXECUTABLE_SUFFIX': '',
-  'OS': 'linux',
+#  'OS': 'linux',
   'INTERMEDIATE_DIR': '$(obj)/geni',
   'SHARED_INTERMEDIATE_DIR': '$(obj)/gen',
   'PRODUCT_DIR': '$(builddir)',
   'RULE_INPUT_ROOT': '%(INPUT_ROOT)s',  # This gets expanded by Python.
   'RULE_INPUT_PATH': '$<',
 
   # These appear unused -- ???
   'RULE_INPUT_EXT': 'XXXEXT$(suffix $^)',
   'RULE_INPUT_NAME': 'XXXNAME$(notdir $(basename $^)0',
   'CONFIGURATION_NAME': '$(BUILDTYPE)',
@@ skipping 561 matching lines @@
     if extra_outputs:
       self.WriteMakeRule([self.output], extra_outputs,
                          comment = 'Build our special outputs first.',
                          order_only = True)
 
     if self.type not in ('settings', 'none'):
       for configname in sorted(configs.keys()):
         config = configs[configname]
         self.WriteList(config.get('ldflags'), 'LDFLAGS_%s' % configname)
       self.WriteList(spec.get('libraries'), 'LIBS')
-      self.WriteLn('%s: LDFLAGS := $(LDFLAGS_$(BUILDTYPE)) '
-                   '$(LIBS)' % self.output)
+      self.WriteLn('%s: LDFLAGS := $(LDFLAGS_$(BUILDTYPE))' % self.output)
+      self.WriteLn('%s: LIBS := $(LIBS)' % self.output)
 
     if self.type == 'executable':
       self.WriteDoCmd([self.output], link_deps, 'link')
     elif self.type == 'static_library':
       self.WriteDoCmd([self.output], link_deps, 'alink')
     elif self.type in ('loadable_module', 'shared_library'):
       self.WriteDoCmd([self.output], link_deps, 'solink')
     elif self.type == 'none':
       # Write a stamp line.
       self.WriteDoCmd([self.output], deps, 'touch')
@@ skipping 147 matching lines @@
     writer.Write(qualified_target, output_file, options.depth, spec, configs)
 
     # Our root_makefile lives at the source root.  Compute the relative path
     # from there to the output_file for including.
     submakefile_path = gyp.common.RelativePath(output_file, options.depth)
     root_makefile.write('include ' + submakefile_path + "\n")
 
   root_makefile.write(SHARED_FOOTER)
 
   root_makefile.close()