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Detail:
  Large file support made use of long longs in various definitions. These
  were switched out in PCC mode, but no allowances were made for the fact
  that C90 doesn't define long long either.
  Remember that to force cc to use non-builtin standard headers, you need
  to point at these using the -j switch (e.g. -jC:). The only version of
  cc which featured the C90-incompatible stdio.h was 5.70.
Admin:
  Checked that the header now works when included in -pcc, -c90 and -c99 modes.

Version 5.81. Tagged as 'RISC_OSLib-5_81'