Charles Crisler wrote: > gcc -shared -fPIC -march=i486 -g -Wl,--version-script=merlotcore.ver -o > $@ $^ $(XLIBS) That is the command used to link the program, apparently. -march at that point is irrelevant. It needs to be specified when the object is compiled. Also, regarding the difference between Fedora and Ubuntu: it is possible to change the default setting of -march when configuring gcc itself. The Debian gcc package maintainers (and hence also Ubuntu) do this to set i486 as the default, IIRC. Apparently the Fedora gcc packagers do not. In any case, it's still a bug to rely on features of a particular arch and then assume that arch has been selected by the toolchain. Brian