/usr/include/ruby-2.5.0/ruby/backward/util.h is in ruby2.5-dev 2.5.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #if defined __GNUC__
#warning use "ruby/util.h" instead of bare "util.h"
#elif defined _MSC_VER
#pragma message("warning: use \"ruby/util.h\" instead of bare \"util.h\"")
#endif
#include "ruby/util.h"
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