Created attachment 560082 [details] build.log Compile error dev-lang/rust on ~amd64.
Created attachment 560084 [details] emerge --info
Builds ok with USE="-system-llvm".
while I fixed cblas thing in #676278 let's deal with your core problem here. can you provide build log after setting this right before running ebuild/emerge export RUSTFLAGS="-v" RUST_BACKTRACE=1 it should produce more meaningful output.
closing, no longer in the tree