mips configure failure

Hi all,

I know MIPS isn't meant to be a supported architecture, but at the moment node 0.12.0 configures for it (and as I watch, is thus far successfully building), while io.js 1.4.2 does not.

Here's the ./configure --dest-cpu=mips output:

creating  ./icu_config.gypi
{ 'target_defaults': { 'cflags': [],
                       'default_configuration': 'Release',
                       'defines': [],
                       'include_dirs': [],
                       'libraries': []},
  'variables': { 'host_arch': 'x64',
                 'icu_small': 'false',
                 'node_install_npm': 'true',
                 'node_prefix': '',
                 'node_shared_http_parser': 'false',
                 'node_shared_libuv': 'false',
                 'node_shared_openssl': 'false',
                 'node_shared_v8': 'false',
                 'node_shared_zlib': 'false',
                 'node_tag': '',
                 'node_use_dtrace': 'false',
                 'node_use_etw': 'false',
                 'node_use_lttng': 'false',
                 'node_use_mdb': 'false',
                 'node_use_openssl': 'true',
                 'node_use_perfctr': 'false',
                 'openssl_no_asm': 0,
                 'python': '/usr/bin/python',
                 'target_arch': 'mips',
                 'uv_library': 'static_library',
                 'uv_parent_path': '/deps/uv/',
                 'uv_use_dtrace': 'false',
                 'v8_enable_gdbjit': 0,
                 'v8_enable_i18n_support': 0,
                 'v8_no_strict_aliasing': 1,
                 'v8_optimized_debug': 0,
                 'v8_random_seed': 0,
                 'v8_use_snapshot': 'false',
                 'want_separate_host_toolset': 0}}
creating  ./config.gypi
creating  ./config.mk
gyp: name 'mips_arch_variant' is not defined while evaluating condition 'mips_arch_variant=="r6"' in /home/jdub/openwrt/build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/iojs-v1.4.2/deps/v8/tools/gyp/v8.gyp while loading dependencies of /home/jdub/openwrt/build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/iojs-v1.4.2/node.gyp while trying to load /home/jdub/openwrt/build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/iojs-v1.4.2/node.gyp
Error running GYP

Thanks for your work on io.js!