Thunderbird make error

Hello,

I am quite new to Zeta... trying to build a more up-to-date version of 
the mozilla-thunderbird.

make stops with an error:
_____________________________________________
/boot/home/mozilla/toolkit/xre/nsUpdateDriver.cpp:341: error: `getpid' 
undeclared (first use this function)
/boot/home/mozilla/toolkit/xre/nsUpdateDriver.cpp:341: error: (Each 
undeclared identifier is reported only once
/boot/home/mozilla/toolkit/xre/nsUpdateDriver.cpp:341: error: for each 
function it appears in.)
make[4]: *** [nsUpdateDriver.o] Error 1
make[4]: Leaving directory `/boot/home/mozilla/tbird/toolkit/xre'
make[3]: *** [libs] Error 2
make[3]: Leaving directory `/boot/home/mozilla/tbird/toolkit'
make[2]: *** [tier_50] Error 2
make[2]: Leaving directory `/boot/home/mozilla/tbird'
make[1]: *** [alldep] Error 2
make[1]: Leaving directory `/boot/home/mozilla/tbird'
make: *** [alldep] Error 2   

Does anyone have an idea about this?

BTW. I can't find my ~/.profile . Is there a file like that, to save 
the env- variables permanently?

Thank you for all your help

Stefan