HAVE_FTRUNCATE    249 .ext/include/x86_64-linux/ruby/config.h #define HAVE_FTRUNCATE 1
HAVE_FTRUNCATE    410 include/ruby/win32.h #undef HAVE_FTRUNCATE
HAVE_FTRUNCATE    411 include/ruby/win32.h #define HAVE_FTRUNCATE 1