install fails on OSX with clang (xcode 4) compiler

[vincentcr]

with the latest xcode compiler on mac, the installation fails with:

  c++ '-D_LARGEFILE_SOURCE' '-D_FILE_OFFSET_BITS=64' '-D_DARWIN_USE_64_BIT_INODE=1' -I/Users/vincent/.node-gyp/0.8.4/src -I/Users/vincent/.node-gyp/0.8.4/deps/uv/include -I/Users/vincent/.node-gyp/0.8.4/deps/v8/include  -Os -gdwarf-2 -Wnewline-eof -mmacosx-version-min=10.5 -arch x86_64 -Wall -Wendif-labels -W -Wno-unused-parameter -fno-rtti -fno-exceptions -fno-threadsafe-statics -fno-strict-aliasing -MMD -MF ./Release/.deps/Release/obj.target/bignum/bignum.o.d.raw  -c -o Release/obj.target/bignum/bignum.o ../bignum.cc
../bignum.cc:270:26: error: variable length array of non-POD element type 'Handle<v8::Value>'
    Handle<Value> newArgs[len];

I was able to get around this by overriding the default compiler like this:

CXX=g++ npm install bigint