I just tried to shoot up aolserver as root, and *didn't* get an error in the aolserver log, but got the same pq_recvbuf: error from postgres... The server is still unreachable and ps auxww doesn't give me a result for aolserver. Aolserver works properly though as the sample-script.tcl worked!
I found the following rpms installed on my system
compat-libstdc++-7.3-2.96.110
libstdc++-3.2-7
libstdc++-devel-3.2-7