答: 修改automake的规则
--- a/bin/automake
+++ b/bin/automake
@@ -3878,7 +3878,7 @@ sub substitute_ac_subst_variables_worker
sub substitute_ac_subst_variables
{
my ($text) = @_;
- $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+ $text =~ s/\$[{]([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
return $text;
}