gnu/stubs-32.h: No such file or directory

Written here so I won’t forget it next time: on REHL if I want to
compile a 32 bit app with my gcc 64bit compiler I need to install
glibc-devel.i386. I always forget this guy when setting up my wokstation.
And of course I always stumble upon it each time I have to compile a
legacy app. This small line solves the problem:

sudo yum install glibc-devel.i386