Hey Ludo! > Could it be that there are two different libcs involved? I can only spot one in environment-variables file. > Do you know which acl is fixing (commencement.scm vs. acl.scm)? Yes it's the acl that is rooted in the bootstrap toolchain. Here's the full build log attached. I'm also cc-ing janneke which has some experience in that matter :). Thanks for having a look, Mathieu