$ sudo cpanm Crypt::Curve25519
--> Working on Crypt::Curve25519
Fetching http://www.cpan.org/authors/id/A/AJ/AJGB/Crypt-Curve25519-0.06.tar.gz ... OK
Configuring Crypt-Curve25519-0.06 ... OK
Building and testing Crypt-Curve25519-0.06 ... FAIL
! Installing Crypt::Curve25519 failed. See /home/tinyos/.cpanm/work/1557136045.12229/build.log for details. Retry with --force to force install it.