working strerror_r not properly detected

[Benno Schulenberg]

Hi,

Having built grep from CVS, I hit a problem: when trying to search a 
pattern in a non-existent file, it produces this message:

  src/grep: notafile: []

where the [] is some unprintable unicode character.  This happens 
because in line 170 of lib/error.c HAVE_WORKING_STRERROR_R appears 
not to be defined.  (When I define it, it works as it should.)  But 
during ./configure it seems to be detected okay:

  checking whether strerror_r returns char *... yes

What is going wrong here?

A zipped config.log is attached.

Benno

config.log.gz
Description: GNU Zip compressed data