LDAP C-SDK & PHP

I have been trying to compile PHP 5.2.3 (AIX 5.1 / gcc 4.0) with an
older kit ldapcsdk (5.11?). The configure of PHP is failing with the
LDAP option because it can't find two libraries (ssl3 and ssldap50). The
files libssl3.so and libssldap50.so DO exist in the appropriate /lib
directory. However, the corresponding ".a" files (libssl3.a,
libssldap50.a) DO NOT exist. I'm not a "c" expert so I'm not sure if the
".a" files should exists or not.

If anyone can explain how to create the ".a" files OR provide some clues
with compiling the newer LDAP C-SDK on AIX would be a great help.

Thanks,
Tim