The POSIX function strncasecmp() is used in three libgfortran files. It is located in <strings.h>, but these files include <string.h> (singular vs. plural). Apparently most implementations (linux, darwin, …) are lenient and allow that, but not mingw32, causing PR 70311 (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70311)
The attached patch, bootstrapped and regtested on x86_64-apple-darwin16.3.0, fixes the issue by including the proper header. Committed as revision 243843. FX
strings.diff
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