OCI on Linux

Hi,
I am trying to use the OCI libraries to connect to Oracle (and then do something worthwhile). This is what I did so far:
1. Built a development box with Celeron 400 Mhz, redhat 6.2.
2. Created a directory structure for oracle similar to an existing box that had oracle server on it.
3. Copied all the header files from the directories ORACLE_HOME/rdbms/demo, ORACLE_HOME/rdbms/public and ORACLE_HOME/network/public
3. Copied the libraries "libclnsh.so" and "libwtc8.so" to ORACLE_HOME/lib
4. Wrote a test program, within which I have the following:
<snip>
OCILogon(envhp, errhp, &svchp,
username, (ub4)strlen((char*)username),
password, (ub4)strlen((char*)password),
server, (ub4)strlen((char*)server));
</snip>
5. Compiled and ran successfully. But couldn't connect. For the above "OCILogon", this is what I get:
main.c(74): Error - OCI_ERROR:
Error while trying to retrieve text for error ORA-12154
6. Copied the file "tnsnames.ora" to the directory ORACLE_HOME/network/admin (from the db server). This is what it contains:
#begin
SEIPL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.0.151)(PORT = 1521))
(CONNECT_DATA =
(SID = seipl)
#end
7. Recompiled and ran and got the same error again.
8. Added "ORACLE_HOME" in my ".bash_profile" and re-ran and got the same error.
I did NOT install oracle client on the development box, since I read (a long time ago), that all I need is these libraries.
Any ideas, whats missing? Anything I am doing wrong?
TIA,
manav.

I'm not sure what you are doing wrong, but as far as I remember, you should be able install the OCI libraries without the client and the rest of the software that comes with it.

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