gcc fails to build on OS X

[rprechelt]

I know there has been a couple of gcc issues raised recently but I still can't get any of the following packages to build:

nixpkgs-gcc
nixpkgs-gcc6
gcc-wrapper-6.1.0
gcc-wrapper-5.3.0

Attempted with either nix-env -iA nixpkgs.gcc* or nix-env -i gcc-wrapper-*.

This is the error received when attempting to build nixpkgs-gcc.

make: *** [bootstrap] Error 2
builder for ‘/nix/store/4b1m5271ks3hzw9c7db2f195r93zsz6g-gcc-5.3.0.drv’ failed with exit code 2
cannot build derivation ‘/nix/store/im9lrvna49ryyvcv6kd9m1pja825qp10-gcc-wrapper-5.3.0.drv’: 1 dependencies couldn't be built
error: build of ‘/nix/store/im9lrvna49ryyvcv6kd9m1pja825qp10-gcc-wrapper-5.3.0.drv’ failed

This is a completely fresh install of OS X El Capitan (nixwas the first thing that I installed, closely followed by my gcc attempt), and with a fresh install of nix.

[rprechelt]

Attempting nix-env -iA nixpkgs.gcc6 results in the following error:

ld: library not found for -lc
collect2: error: ld returned 1 exit status
Makefile:945: recipe for target 'libgcc_s.dylib' failed
make[3]: *** [libgcc_s.dylib] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/private/var/folders/mt/c_dppb2s51bbvm3yy67mns080000gn/T/nix-build-gcc-6.1.0.drv-0/build/x86_64-apple-darwin15.5.0/libgcc'

yet locate libc.dylib returns

/nix/store/d6pmsgblamr0wfvpdzikv8xnlfs5sjym-Libsystem-osx-10.9.5/lib/libc.dylib
/nix/store/w090w1675pg26kcwj7ka9f42c0a87wg9-Libsystem-osx-10.9.5/lib/libc.dylib
/usr/lib/libc.dylib

[vcunat]

This should be closed in favor of NixOS/nixpkgs#16806 (I can't do it)

[copumpkin]

#1008