with Perl 5.12.3 we changed $self->{"nametemplate_pem"} via $file modification

with such config:
nametemplate_pem = @ALIAS@.r@R@.pem
infodir = /etc/pki/esteid
cadir = /etc/pki/esteid
output = /etc/pki/esteid/crl
formats = openssl, pem

it tried to:
VERBOSE(3) Writing PEM file /etc/pki/esteid/crl//etc/pki/esteid/crl/ESTEID-SK_2007.r0.pem
should had been:
VERBOSE(3) Writing PEM file /etc/pki/esteid/crl/ESTEID-SK_2007.r0.pem

16:21:09  SamChi> glen: foreach does not copy the value, it assigns each value of the list to the variable
16:21:31  SamChi> glen: unless it is not a valid lvalue, then it may have to be copied
16:22:12  SamChi> $ perl -le '@a = qw(a b); foreach (@a) { $_ .= "foobar" }; print "@a"'
16:22:12  SamChi> afoobar bfoobar
16:22:55  SamChi> glen: oh, I was wrong about the second part
16:23:03  SamChi> $ perl -le '@a = qw(a b); foreach my $v (@a, "c") { $v .= "foobar" }; print "@a"'
16:23:03  SamChi> Modification of a read-only value attempted at -e line 1.

--- fetch-crl-3.0.6/fetch-crl	2011-03-20 05:01:20.000000000 +0200
+++ fetch-crl-3.0.6/fetch-crl	2011-06-11 11:30:58.731040625 +0300
@@ -1873,13 +1879,14 @@
            $::cnf->{_}->{"output_der"}, $::cnf->{_}->{"output_pem"},
            $::cnf->{_}->{"output_nss"}, $::cnf->{_}->{"output_openssl"}) ) {
         defined $output and $output or next;
-        foreach my $file (
+        foreach my $ref (
               $self->{"nametemplate_der"},
               $self->{"nametemplate_pem"},
               $self->{"alias"}.".r\@R\@",
               $self->{"anchorname"}.".r\@R\@",
             ) {
-          next unless $file;
+          next unless $ref;
+          my $file = $ref; # copy, not to change original
           $file =~ s/\@R\@/$i/g;
           $file = join "/", $output, $file;
           next if ! -e $file;