diff -up Data-MessagePack-1.00/Makefile.PL.orig Data-MessagePack-1.00/Makefile.PL
--- Data-MessagePack-1.00/Makefile.PL.orig	2017-05-18 10:08:59.363065424 +0200
+++ Data-MessagePack-1.00/Makefile.PL	2017-05-18 10:09:36.414907888 +0200
@@ -1,5 +1,7 @@
 # Usage: Makefile.PL --pp # disable XS
 #        Makefile.PL -g   # add -g to the compiler and disable optimization flags
+BEGIN { push @INC, '.'; }
+
 use inc::Module::Install;
 use Module::Install::XSUtil 0.44;
 use Module::Install::AuthorTests;