(Looks like the second message in this thread was not forwarded to the list).
There are several problems related to LANG. As this ticket shows, perl warns when it has no support for the locale specified, and the warnings interferes with the output expected by the tests. Also several Configure checks for programs can fail because of LANG. For example, in my system bison is not detected when --maintainer is used. Prefixing the commands with LANG=C is a solution in systems with sh-like shells, but it will break in others. -- Salu2
