Running ./pre-inst-env guix build --target=i686-unknown-linux-gnu hello on core-updates (and similarly on core-updates-next) fails with --8<---------------cut here---------------start------------->8--- checking for i686-unknown-linux-gnu-gcc... /tmp/guix-build-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0.drv-0/build/./gcc/xgcc -B/tmp/guix-build-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0.drv-0/build/./gcc/ -B/gnu/store/p4x4981zidgq36rjkx0bxb466s81xk2z-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0/i686-unknown-linux-gnu/bin/ -B/gnu/store/p4x4981zidgq36rjkx0bxb466s81xk2z-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0/i686-unknown-linux-gnu/lib/ -isystem /gnu/store/p4x4981zidgq36rjkx0bxb466s81xk2z-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0/i686-unknown-linux-gnu/include -isystem /gnu/store/p4x4981zidgq36rjkx0bxb466s81xk2z-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0/i686-unknown-linux-gnu/sys-include checking for C compiler default output file name... configure: error: in `/tmp/guix-build-gcc-cross-sans-libc-i686-unknown-linux-gnu-7.4.0.drv-0/build/i686-unknown-linux-gnu/libmpx': configure: error: C compiler cannot create executables See `config.log' for more details. --8<---------------cut here---------------end--------------->8--- The attached patch fixes this. I stumbled upon this while working to fix #37549. Where should this patch land? Greetings, janneke