Inability to init db Postgresql-9.1.1 on Ubuntu

Hi,

I have to make some experiments for which I explicitly need version 9.1.1
of PostgreSQL.

I have installed it from source using the official documentation but I am
not able to initialize the cluster after that.

When I run initdb, I receive the following error:
STATEMENT: REVOKE ALL on pg_authid FROM public;

I found out on your forums that normally this is a compiler error.

So I used:
CC="gcc-4.7" CFLAGS="-g -O0" ./configure -enable-debug -enable-depend
-prefix=$HOME/paqo -enable-cassert

But still I receive the same error. I changed the compiler and then I hit
a strange error which is telling me that I have a missing "}" at my
system_view.sql file which is not correct.

I am trying the installation on 64 bit Ubuntu Desktop 16.04.4

Please advise. I am struggling on this since a couple of days and becomes a
little bit urgent already.

Thank you in advance!

Have a nice weekend,
Ekaterina