The NT POSIX C Runtime Library is an IEEE standard runtime library for the NT POSIX subsystem. It can be used as a complete replacement or a side by side alternative for what is shipped with the Interix SDK.
Have you been struggling with compiling C++ with Windows and MinGW or Cygwin? Do you use Linux? So this one is for you. With it you can easily build libs for 32 and 64 bit Windows on Linux. Mac OS X libs planned.