-AC_DEFUN(AM_SANITY_CHECK,
-[AC_MSG_CHECKING([whether build environment is sane])
-# Just in case
-sleep 1
-echo timestamp > conftestfile
-# Do `set' in a subshell so we don't clobber the current shell's
-# arguments. Must try -L first in case configure is actually a
-# symlink; some systems play weird games with the mod time of symlinks
-# (eg FreeBSD returns the mod time of the symlink's containing
-# directory).
-if (
- set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null`
- if test "[$]*" = "X"; then
- # -L didn't work.
- set X `ls -t $srcdir/configure conftestfile`
- fi
- if test "[$]*" != "X $srcdir/configure conftestfile" \
- && test "[$]*" != "X conftestfile $srcdir/configure"; then
-
- # If neither matched, then we have a broken ls. This can happen
- # if, for instance, CONFIG_SHELL is bash and it inherits a
- # broken ls alias from the environment. This has actually
- # happened. Such a system could not be considered "sane".
- AC_MSG_ERROR([ls -t appears to fail. Make sure there is not a broken
-alias in your environment])
- fi
-
- test "[$]2" = conftestfile
- )
-then
- # Ok.
- :
-else
- AC_MSG_ERROR([newly created file is older than distributed files!
-Check your system clock])