X ports trying to use dtrace

A number of X ports are auto-detecting dtrace and trying to use it 
during their build:

./xorg-vfbserver-1.4_1,1.log:checking for dtrace... /usr/sbin/dtrace
./xorg-vfbserver-1.4_1,1.log:/usr/sbin/dtrace -C -h -o Xserver-dtrace.h 
-s ./Xserver.d  || cp Xserver-dtrace.h.in Xserver-dtrace.h
./xorg-vfbserver-1.4_1,1.log:dtrace: failed to compile script 
./Xserver.d: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"
./xorg-vfbserver-1.4_1,1.log:/usr/sbin/dtrace -G -C -o dtrace-dix.o -s 
../dix/Xserver.d .libs/*.o
./xorg-vfbserver-1.4_1,1.log:dtrace: failed to compile script 
../dix/Xserver.d: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near 
"uid_t"
./xorg-nestserver-1.4_1,1.log:checking for dtrace... /usr/sbin/dtrace
./xorg-nestserver-1.4_1,1.log:/usr/sbin/dtrace -C -h -o Xserver-dtrace.h 
-s ./Xserver.d  || cp Xserver-dtrace.h.in Xserver-dtrace.h
./xorg-nestserver-1.4_1,1.log:dtrace: failed to compile script 
./Xserver.d: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"
./xorg-nestserver-1.4_1,1.log:/usr/sbin/dtrace -G -C -o dtrace-dix.o -s 
../dix/Xserver.d .libs/*.o
./xorg-nestserver-1.4_1,1.log:dtrace: failed to compile script 
../dix/Xserver.d: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near 
"uid_t"
./xephyr-1.4_1.log:checking for dtrace... /usr/sbin/dtrace
./xephyr-1.4_1.log:/usr/sbin/dtrace -C -h -o Xserver-dtrace.h -s 
./Xserver.d  || cp Xserver-dtrace.h.in Xserver-dtrace.h
./xephyr-1.4_1.log:dtrace: failed to compile script ./Xserver.d: 
"/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"
./xephyr-1.4_1.log:/usr/sbin/dtrace -G -C -o dtrace-dix.o -s 
../dix/Xserver.d .libs/*.o
./xephyr-1.4_1.log:dtrace: failed to compile script ../dix/Xserver.d: 
"/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"
./xorg-dmx-1.4_3,1.log:checking for dtrace... /usr/sbin/dtrace
./xorg-dmx-1.4_3,1.log:/usr/sbin/dtrace -C -h -o Xserver-dtrace.h -s 
./Xserver.d  || cp Xserver-dtrace.h.in Xserver-dtrace.h
./xorg-dmx-1.4_3,1.log:dtrace: failed to compile script ./Xserver.d: 
"/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"
./xorg-dmx-1.4_3,1.log:/usr/sbin/dtrace -G -C -o dtrace-dix.o -s 
../dix/Xserver.d .libs/*.o
./xorg-dmx-1.4_3,1.log:dtrace: failed to compile script 
../dix/Xserver.d: "/usr/lib/dtrace/psinfo.d", line 37: syntax error near 
"uid_t"

What is the solution here?

Kris