On Sun, Sep 20, 2015 at 03:52:34PM -0400, Jeffrey Walton wrote: > > # find /usr -name cdefs.h > /usr/include/x86_64-linux-gnux32/sys/cdefs.h
If you want to show include directories, you should show cpp -v, not gcc -v. But it's obvious why this doesn't work since you're telling it to build for amd64, not for x32. > # ./config > Operating system: x86_64-whatever-linux2 That is clearly not what you want. Your libc dev package at least doesn't match that. Please note that it's calling gcc with -m64, but you don't have the headers for that. Why are you reporting something about the upstream source to Debian while the Debian package build fine? It has an debian-x32 target that uses -mx32. I'm not sure there is a sane way to make config auto detect that you want x32. You should at least make uname -m report x32 instead of x86_64. If you remove the -m64 it might also just work for you, but I have no idea if it requires the -mx32 or not. Kurt
