/usr/x86_64-w64-mingw32/include/pthread_unistd.h is in mingw-w64-x86-64-dev 2.0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | /* Dummy header, which gets overriden, if winpthread library gets installed. */
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