Hi Leo, Leo Famulari writes: > On Wed, Oct 27, 2021 at 12:26:01AM +0200, Nicolò Balzarotti wrote: >> (I'm on an old X200 thinkpad). Might it be that build is not >> deterministic (and we should disable some optimization)? > > As a test, I replaced march=native with march=x86-64. > > [...] > > Or maybe the package could use #:substitutable #f, since b2sum is a very > quick build. This blog post [fn:1] on guix-hpc address the "Pre-built binaries vs. performance" dilemma. I guess the easiest way is to provide a variant (b2sum-avx or something like that) with avx enabled. Else, I'd just go with the unoptimized version as it happens for many other packages, but let's hear from others. Thanks, Nicolò [fn:1] https://hpc.guix.info/blog/2018/01/pre-built-binaries-vs-performance/