[OpenBIOS] adding words to open bios

[G 3]

I'm having a lot of difficulty trying to add my own words to OpenBIOS.
I though it would be easy as defining the word and saving it in one of
the .fs files. Here is my simple word

: testword
." this is a test word"
;

I tried adding this word to start.fs, but when I try to compile
OpenBIOS r666, I receive this error:

john at iBook:~/openbios-devel$ make
Building OpenBIOS for ppc
Building...error:
make[1]: Entering directory `/home/john/openbios-devel/obj-ppc'
  GEN   bootstrap.dict
panic: segmentation violation at (nil)
dict=0x48131008 here=0x48136624(dict+0x561c) pc=0x4813380c(dict+0x2804)
dstackcnt=4 rstackcnt=5 instruction=481312ec
dstack: 0x0 0x0 0x0 0x0 0x22
rstack: 0x0 0x48133b6c 0x48133b78 0x481338ac 0x0 0x0
Writing dictionary core file
make[1]: *** [bootstrap.dict] Error 1
make[1]: Leaving directory `/home/john/openbios-devel/obj-ppc'
make: *** [build] Error 1

Could someone point me into the right direction?