about the ! builtin (Was: Re: gettext-0.14.1 build fails to run csc)

[Alexandre Duret-Lutz]

>>> "Bruno" == Bruno Haible <address@hidden> writes:

[...]
 Bruno> sscli)
 Bruno>   if test -n "$HAVE_CSC_IN_PATH" \
 Bruno>             && csc -help >/dev/null 2>/dev/null \
 Bruno>             && ! { csc -help 2>/dev/null | grep -i chicken > /dev/null; 
}; then
 Bruno>     HAVE_CSC=1
 Bruno>     ac_result="csc"
 Bruno>     break
[...]

Hmm, the `Limitations of Shell Builtins' section of the autoconf
manual says:

`!'    
     You can't use `!'; you'll have to rewrite your code.

Would had been nice to document why.  Where does it not work?
-- 
Alexandre Duret-Lutz