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Detail:
  This is useful for building tools during the course of a main build where
  the build host is of an incompatible architecture to the target - for example
  building an Iyonix ROM on a Risc PC or an architecture-tuned Beagleboard ROM
  on an Iyonix.  For now it relies on re-using the target architecture versions
  of CApp and other makefile fragments so it's not suitable for cross-
  compilation yet (in other words, the host system is still assumed to be a
  RISC OS machine).
Admin:
  Tested by building an APCS-R target on an Iyonix (with a few tweaks - we
  can't link with the APCS-R stubs on an Iyonix, but the stubs should be
  architecture-invariant within the same calling standard so this isn't a
  real problem).

Version 4.75. Tagged as 'BuildSys-4_75'