On my -CURRENT box (updated in 2002/03/28), building 
audio/kdemultimedia2 fails as shown next:
===>  Building for kdemultimedia-2.2.2_2
...
mkdir .libs
cc -DDEFAULT_PATH=\"//usr/local/share/apps/kmidi/config\" -DAU_OSS -DIA_XAW -I/usr/include -D_GETOPT_H -D_PTH_H_ -D_PTH_PTHREAD_H_ -I/usr/local/include -I/usr/local/include -I/usr/X11R6/include/qt2 -D_THREAD_SAFE -I/usr/local/include -O3 -fomit-frame-pointer -ffast-math -pthread -o timidity timidity.o common.o readmidi.o playmidi.o resample.o mix.o instrum.o tables.o controls.o output.o filter.o wave_a.o raw_a.o dumb_c.o fffload.o sndfont.o readsbk.o effects.o reverb_e.o chorus_e.o phaser_e.o celeste_e.o resample_l.o resample_f.o cfg.o b_out.o hpux_a.o linux_a.o linux_a2.o sun_a.o dec_a.o hpux_d_a.o alsa_a.o arts_a.o bsd20_a.o esd_a.o nas_a.o ncurs_c.o slang_c.o tk_c.o gtk_i.o ctl.o motif_c.o motif_i.o motif_p.o xaw_i.o xaw_c.o -Wl,-export-dynamic  -L/usr/local/lib /usr/local/lib/libartsc.so -L/usr/X11R6/lib -lXaw -lXt -lX11 -lm -ljpeg -lgcc -lstdc++ -Wl,--rpath -Wl,/usr/local/lib -Wl,--rpath -Wl,/usr/local/lib
/usr/X11R6/lib/libXaw.so: warning: tmpnam() possibly used unsafely; consider using mkstemp()
readmidi.o: In function `read_track':
readmidi.o(.text+0x147c): undefined reference to `__uint8_swap_uint32'
readmidi.o: In function `read_midi_file':
readmidi.o(.text+0x1f38): undefined reference to `__uint8_swap_uint32'
readmidi.o(.text+0x2026): undefined reference to `__uint8_swap_uint16'
readmidi.o(.text+0x2039): undefined reference to `__uint8_swap_uint16'
readmidi.o(.text+0x204f): undefined reference to `__uint8_swap_uint16'
output.o: In function `s32tos16x':
output.o(.text+0x160): undefined reference to `__uint8_swap_uint16'
output.o: In function `s32tou16x':
output.o(.text+0x1c7): undefined reference to `__uint8_swap_uint16'
xaw_c.o: In function `xaw_add_midi_file':
xaw_c.o(.text+0x304): undefined reference to `__uint8_swap_uint32'
gmake[3]: *** [timidity] Error 1
gmake[3]: Leaving directory `/var/tmp/var/tmp/ports/audio/kdemultimedia2/work/kdemultimedia-2.2.2/kmidi/TIMIDITY'
gmake[2]: *** [all-recursive] Error 1
gmake[2]: Leaving directory `/var/tmp/var/tmp/ports/audio/kdemultimedia2/work/kdemultimedia-2.2.2/kmidi'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/var/tmp/var/tmp/ports/audio/kdemultimedia2/work/kdemultimedia-2.2.2'
gmake: *** [all-recursive-am] Error 2
*** Error code 2

Stop in /var/tmp/ports/audio/kdemultimedia2.

Fix: Apply a patch next. But this is not good solution, I think. I 
hope that someone show true one.
How-To-Repeat: cd ${PORTSDIR}/audio/kdemultimedia2 && make