Problems with 4.1 PHP5 modules

[L. V. Lammert]

One of my development machine has been upgraded many times over the years, 
of couse, .. now trying to setup a php test site for a new project (have 
not had php installed before). For some reason I cannot get any of the PHP 
*modules* to initialize (they install, but will not appear in phpinfo). 
Could this possibly be due to the ELF transition or something else 'hanging 
around' from an older version? That is about the only idea I can come up 
with, .. as php5 installs OK (php4 was not installed previously), all the 
libraries seem to be in the proper places, and no errors show in the apache 
logs.

Does anyone have a recommendation on how to troublehoot?
        TIA,

        Lee