1diff -Naur a/cpan/ExtUtils-MakeMaker/lib/ExtUtils/MakeMaker.pm b/cpan/ExtUtils-MakeMaker/lib/ExtUtils/MakeMaker.pm
2--- a/cpan/ExtUtils-MakeMaker/lib/ExtUtils/MakeMaker.pm 2017-06-30 17:03:20.000000000 -0400
3+++ b/cpan/ExtUtils-MakeMaker/lib/ExtUtils/MakeMaker.pm 2018-02-28 10:06:37.031237946 -0500
4@@ -1267,7 +1267,12 @@
5 my $value = shift;
6 return $value if $UNDER_CORE;
7 my $tvalue = '';
8- require B;
9+ eval {
10+ require B;
11+ };
12+ if ($@) {
13+ return $tvalue;
14+ }
15 my $sv = B::svref_2object(\$value);
16 my $magic = ref($sv) eq 'B::PVMG' ? $sv->MAGIC : undef;
17 while ( $magic ) {