Thanks. Yes, it's indeed not aMule, but it isn't wx either.
OK:
$ nm /usr/lib/libwxregexu-2.6.a | grep wx_regfree
00000000 T wx_regfree
Not OK:
$ nm /opt/wxGTK/lib/libwxregexu-2.7.a | grep wx_regfree
nm: wxregex_regfree.o: no symbols
Both libraries were stripped using "strip --strip-unneeded", but with the latter, it looks like more than only unneeded symbols were removed. Might be a binutils problem.