I've been trying to get the MPC plugin for XMMS to work with x86_64 and managed to get everything to compile by changing some of the gcc options. Unfortunately, XMMS segfaults when I attempt to play an MPC file (though it will allow me to open the configuration window just fine). Does anyone have the MPC plugin working on x86_64?

which version ?

XMMS 1.2.10
libmusepack 1.0a (had to add symbolic links to make it work, otherwise it wouldn't get found)
plugin version 1.1a3

I set the architechture to x86-64 in both makefiles because otherwise it would say that the architecture was incompatible, I'm running on my 32-bit partition at the moment or I'd give you the exact error.

The new version of libmusepack & the plugin work great on x86-64, just change the arch. in the makefiles:
old:
CPPFLAGS = -Wall -fPIC -DPIC -O2 -march=i686 -pipe -DPOSIX -D_REENTRANT
new:
CPPFLAGS = -Wall -fPIC -DPIC -O2 -march=x86-64 -pipe -DPOSIX -D_REENTRANT