AC_PREFIX_PROGRAM and paths containing "."

[Derek Robert Price]

Hey all,

Not sure this shouldn't be the correct behavior, but it doesn't seem 
optimal:

---------- ---------- ---------- ---------- ----------
- Macro: AC_PREFIX_PROGRAM (PROGRAM)
    If the user did not specify an installation prefix (using the
    `--prefix' option), guess a value for it by looking for PROGRAM in
    `PATH', the way the shell does.  If PROGRAM is found, set the
    prefix to the parent of the directory containing PROGRAM;
    otherwise leave the prefix specified in `Makefile.in' unchanged.
    For example, if PROGRAM is `gcc' and the `PATH' contains
    `/usr/local/gnu/bin/gcc', set the prefix to `/usr/local/gnu'.
---------- ---------- ---------- ---------- ----------

When AC_PREFIX_PROGRAM is used, and a user running configure has a PATH 
containing "." with an executable named PROGRAM in ".", prefix gets set 
to ".".

At the least, the associated help available via the "--help" argument to 
configure should be updated to tell the user about looking for PROGRAM 
in the PATH to determine prefix so that they can diagnose the problem 
themselves before reporting problems to package maintainers.  :) 
There's an example report here: 
<http://ccvs.cvshome.org/issues/show_bug.cgi?id=100>.

Derek

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