kernel 'make nconfig' display corruption

[linxon]

https://bugs.gentoo.org/617692

Steps to reproduce:

-- emerge -a grc
-- source /etc/profile
-- cd /usr/src/linux
-- make nconfig (or make menuconfig) and  watch corrupt display

If I comment out the entries under "gcc command" and "make command"
in file /etc/grc.conf the problem goes away

[powerman]

Actually even make oldconfig works incorrectly.