make install fails?

[Paolo Bonzini]

Uros Bizjak wrote:
> Hello!
> 
> Should 'make install' build gcc automatically before installation?
> 
> Currently, this procedure fails:
> - create gcc-build directory.
> - enter directory
> - './configure'
> - 'make install'
> 
> This will result in:
> /bin/sh ../gcc/mkinstalldirs /usr/local /usr/local
> /bin/sh: line 1: cd: fixincludes: No such file or directory
> gmake: *** [install-fixincludes] Error 1

Please file a new PR and make it blocked by 17383.

Paolo