Glasgow Haskell on different versions of Linux

[George Russell]

Christian Maeder wrote:
 > What is "ctype.h" good for?

A good question.  Its only use seems to be in
ghc/rts/RtsFlags.c where it is used for functions
like isdigit and isspace for decoding the RTS flags.
Maybe it should be retired altogether.

I'm rather puzzled how this works if ctype.h isn't
there at all, as it seems to.