Fatal error loading aolserver4-nssha1

[Iuri Sampaio]

Hi there,

In attempt to install OpenACS from scratch on ubuntu precise 12.04 I got 
the following error on aolserver4-nssha1. "could not find Ns_ModuleInit"

When I start up aolserver service I get a warning then a fatal error as 
decribed bellow:

[19/May/2013:19:27:15][18052.714974976][-main-] Notice: modload: loading 
'/usr/lib/aolserver4/bin/nssha1.so'
[19/May/2013:19:27:15][18052.714974976][-main-] Warning: modload: could 
not find Ns_ModuleInit in /usr/lib/aolserver4/bin/nssha1.so
[19/May/2013:19:27:15][18052.714974976][-main-] Fatal: modload: failed 
to load module '/usr/lib/aolserver4/bin/nssha1.so'


I verified that both files are correctly in place
/usr/lib/aolserver4/bin/nssha1.so
/usr/lib/aolserver4/lib/libnssha1.so

Furthermore, I installed aolserver packages via apt-get

I believe the package available on ubuntu repository was compiled 
without Ns_ModuleInit block.

Although, I'm reluctant to believe so I removed nssha1 and installed 
again fro tarball and the problem was solved.

Does anyone have any idea what it could be?
or if my assumption is valid?

Best wishes,
Iuri