I just tried to install node on cygwin and it failed with this error:
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src/uv-cygwin.c:33: error: ‘CLOCK_MONOTONIC’ undeclared (first use in this function)
src/uv-cygwin.c:33: error: (Each undeclared identifier is reported only once
src/uv-cygwin.c:33: error: for each function it appears in.)
make[1]: * [src/uv-platform.o] Error 1