regression test failed

Hello, all!
I got the failed regression test.
Above the fragment of this test:
gmake -C ../../../contrib/spi REFINT_VERBOSE=1 refint.so autoinc.so
gmake[1]: Entering directory `/usr/src/postgresql-7.2.3/contrib/spi'
gmake[1]: `refint.so' is up to date.
gmake[1]: `autoinc.so' is up to date.
gmake[1]: Leaving directory `/usr/src/postgresql-7.2.3/contrib/spi'
/bin/sh ./pg_regress --temp-install --top-builddir=../../..
--schedule=./parallel_schedule --multibyte=
============== removing existing temp installation ==============
============== creating temporary installation ==============
============== initializing database system ==============
============== starting postmaster ==============
running on port 65432 with pid 6415
============== creating database "regression" ==============
CREATE DATABASE
============== dropping regression test user accounts ==============
============== installing PL/pgSQL ==============
And here I got:
Server closed the connection unexpectedly.
This probably means the server terminated abnormally before or while
proccessing the request.

pg_regress: createlang failed

Where I did the mistake? Gmake is o'k. Linux- kernel 2.2.19, postgresql-
7.2.3
Thanks for advance. Regards. Nina.