Gibbrish!

| # $M4.
| my $m4 = $ENV{“M4”} || ‘/bin/m4’;
| # Some non-GNU m4’s don’t reject the –help option, so give them /dev/null.
| fatal “need GNU m4 1.4 or later: $m4”
|   if system “$m4 –help </dev/null 2>&1 | grep reload-state >/dev/null”;
|
| # Set some high recursion limit as the default limit, 250, has already
| # been hit with AC_OUTPUT.  Don’t override the user’s choice.
| $m4 .= ‘ –nesting-limit=1024’
|   if ” $m4 ” !~ / (–nesting-limit(=[0-9]+)?|-L[0-9]*) /;

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