Upstream's syntax is mis-parsed by the rpm dependency generator as a hard requirement.

--- lib/MCE.pm
+++ lib/MCE.pm
@@ -36,10 +36,7 @@ BEGIN {
    $_oid = "$$.$_tid";
 
    if ($] ge '5.008008' && !exists $INC{'PDL.pm'}) {
-      eval '
-         use Sereal::Encoder 3.015 qw( encode_sereal );
-         use Sereal::Decoder 3.015 qw( decode_sereal );
-      ';
+      eval 'use Sereal::Encoder 3.015 qw( encode_sereal ); use Sereal::Decoder 3.015 qw( decode_sereal );';
       if ( !$@ ) {
          my $_encoder_ver = int( Sereal::Encoder->VERSION() );
          my $_decoder_ver = int( Sereal::Decoder->VERSION() );