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-rw-r--r--lib/Automake/Variable.pm5
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/Automake/Variable.pm b/lib/Automake/Variable.pm
index 8a5b56875..326136031 100644
--- a/lib/Automake/Variable.pm
+++ b/lib/Automake/Variable.pm
@@ -193,7 +193,7 @@ my %_ac_macro_for_var =
);
# The name of the configure.ac file.
-my $configure_ac = find_configure_ac;
+my $configure_ac;
# Variables that can be overridden without complaint from -Woverride
my %_silent_variable_override =
@@ -1132,6 +1132,9 @@ sub require_variables ($$$@)
my $res = 0;
$reason .= ' but ' unless $reason eq '';
+ $configure_ac = find_configure_ac
+ unless defined $configure_ac;
+
VARIABLE:
foreach my $var (@vars)
{