python3.5m vs libpython3.5m on CentOS6

[Ray Cote]

Hello:

Attempting to install latest psycopg2 (2.6.2) on current CentOS6 with a
custom install Python3.5.

Getting the error:
    /usr/bin/ld: cannot find -lpython3.5m

Don’t have a python3.5m library on the system.
Do have libpython3.5m.so.1.0 with a soft link to libpython3.5m.so.

Thought adding a new python3.5m.so softlink to  libpython3.5m.so.1.0 and
re-running ldconfig would do the trick, but still get the same error.

Any hints appreciated.
—Ray