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which gccdoesn't show/usr/bin/gccor/bin/gcc, you need to either install Cygwin'sgcc-corepackage, or fix your$PATH.where gcc, it tells me C:\MinGW\gcc.exe. I forgot I installed MinGW (gcc is 4.8.1) and am not using Cygwin default gcc.exe - a fact that might have been useful. /cygdrive/c/MinGW/bin is on my PATH (as evidenced by the where command). So it's a potentially different compiler than I reported, but the problem still seems to violate way the -I argument and #include are suppose to work together.-Ioptions to use Windows path names like MinGW-gcc expects, or (b) use the Cygwin build of gcc.ifeq ($(OS),Windows_NT)to detect Cygwin/MinGW.