sdl_mixer fails to compile on amd64

[Sean McNeil]

Here is what I get:

 cc -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\"
-DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE=\"SDL_mixer\"
-DVERSION=\"1.2.6\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1
-DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1
-DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1
-DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -I. -I.
-I/usr/local/include -I/usr/X11R6/include -g -O -pipe
-I/usr/local/include/SDL11 -I/usr/local/include -D_REENTRANT -DUSE_RWOPS
-DCMD_MUSIC -DWAV_MUSIC -DLIBMIKMOD_MUSIC -I/usr/local/include
-D_REENTRANT -DMID_MUSIC -DUSE_TIMIDITY_MIDI -I./timidity -DOGG_MUSIC
-DMP3_MUSIC -I/usr/local/include -I/usr/local/include/smpeg
-I/usr/local/include/SDL11 -I/usr/local/include -D_REENTRANT -MT
effect_position.lo -MD -MP -MF .deps/effect_position.Tpo -c
effect_position.c  -fPIC -DPIC -o .libs/effect_position.o
effect_position.c: In function `_Eff_position_u16msb_c6':
effect_position.c:992: error: extended registers have no high halves
{standard input}: Assembler messages:
{standard input}:3009: Error: suffix or operands invalid for `xchg'
{standard input}:3384: Error: suffix or operands invalid for `xchg'
{standard input}:3395: Error: suffix or operands invalid for `xchg'
{standard input}:3406: Error: bad register name `%'
gmake[1]: *** [effect_position.lo] Error 1

sdl_mixer-1.2.5_3 compiled fine before.

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