rm: conftest.dSYM: is a directory

Hi Everyone,

This old wart just caught my eye on OS X 10.5:

    checking for egrep... /usr/bin/grep -E
    checking for ANSI C header files... rm: conftest.dSYM: is a directory
    rm: conftest.dSYM: is a directory
    yes
    checking for sys/types.h... yes
    ...

Also see https://lists.gnu.org/archive/html/bug-autoconf/2007-11/msg00017.html.

Jeff