There is a new pull request by CMB against master on the void-packages repository https://github.com/CMB/void-packages tcl https://github.com/void-linux/void-packages/pull/27708 tcl: don't build unnecessary compatibility functions. ./configure-time tests are incorrectly flagging some libc functions as broken when cross-compiling. Hard-code correct results of tests. Without this patch, it seems that I cannot link some things (tclx) against tcl on aarch64. A patch file from https://github.com/void-linux/void-packages/pull/27708.patch is attached