diff -up Crypt-DH-GMP-0.00012/Makefile.PL.orig Crypt-DH-GMP-0.00012/Makefile.PL
--- Crypt-DH-GMP-0.00012/Makefile.PL.orig 2019-10-16 11:39:34.570106082 +0200
+++ Crypt-DH-GMP-0.00012/Makefile.PL 2019-10-16 11:41:10.286777085 +0200
@@ -1,3 +1,5 @@
+use lib '.';
+
use inc::Module::Install;
my @DEFINES;