It seem there is a bug in gcc 2.96 of redhat 7.3 ...
It apear when you trying to compile a big file (in your example, "muuli_wdr.cpp" this file contain all the GUI).
At this time, try debugging exactly same problem for another user of aMule, i don't have any tip ...
At the end the user switched to latest redhat (they seem to not upgrade packages for old distributions).
Hope this help even if it didn't fix dirrectly the problem ...
A++