buildworld with WITHOUT_CLANG_IS_CC= ?

[Andreas Tobler]

Hello,

how do I do a buildworld these days with this option set:
WITHOUT_CLANG_IS_CC=

iow, without clang as default compiler?

I fail on amd64 and powerpc64 when it comes to build the 32-bit libs. It
fails because it can not find header files like math.h

The behaviour started with

http://svnweb.freebsd.org/changeset/base/250659

Any ideas how to solve that?

TIA,
Andreas