Postgresql - Segmentation fault (core dumped)

Question

I'm working on postgresql code (server side). I installed a version from source code following the official tutorial: http://www.postgresql.org/docs/8.4/interactive/install-short.html

I did same modification on code, so I need to install again postgresql, but this time my version.

I renamed the /usr/local/pgsql/ in /usr/local/pgsql2/ and I did:

make distclean
./configure
make
sudo make install
sudo mkdir /usr/local/pgsql/data
sudo chown darkcoffeelinux /usr/local/pgsql/data

until now everything went well, but with the command

/usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data/

I got this error:

The files belonging to this database system will be owned by user "darkcoffeelinux".
This user must also own the server process.

The database cluster will be initialized with locale en_US.UTF-8.
The default database encoding has accordingly been set to UTF8.
The default text search configuration will be set to "english".

fixing permissions on existing directory /usr/local/pgsql/data ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 24MB
creating configuration files ... ok
creating template1 database in /usr/local/pgsql/data/base/1 ... ok
initializing pg_authid ... Segmentation fault (core dumped)
child process exited with exit code 139
initdb: removing contents of data directory "/usr/local/pgsql/data"

Additional information: I'm using kubuntu, postgresql 8.4.15