[Distutils] python-dev not installed on Unix

[Juergen Hermann]

Hi!

This=20is=20a=20VERY=20common=20error=20that=20traps=20users=20regularly:

distutils.errors.DistutilsPlatformError:=20invalid=20Python=20installation=
:=20
unable=20to=20open=20/usr/lib/python2.2/config/Makefile=20(No=20such=20fil=
e=20or=20
directory)=20

Could=20we=20extend=20that=20error=20message=20by=20a=20hint=20on=20instal=
ling=20the=20python-
dev=20.rpm/.deb?=20

=09if=20sys.platform=20=3D=20"unix":
=09=09msg=20+=3D=20"\nYou=20probably=20need=20to=20install..."

Ciao,=20J=FCrgen