Build Python 2.7.5 - Modules missing

[Walter Hurry]

On building Python 2.7.5 I got the following message:

Python build finished, but the necessary bits to build these modules
 were not found:
dl                 imageop            linuxaudiodev   
spwd               sunaudiodev                        
To find the necessary bits, look in setup.py in detect_modules()
 for the module's name.

It carried on with the installation OK, but I don't understand the last 
sentence in the message. How can I find out exactly what modules are 
missing, and what I need to do to make sure they are built next time?