modular CVS building problem linking app 'ico'

[Carlos Eduardo Rodrigues Diogenes]

hi,

I was building the modular tree of Xorg and get this error while compiling:

gcc  -g -O2   -o ico  ico-ico.o -L/tmp/modular/lib -lX11 -ldl   -lm
ico-ico.o(.text+0x1bee): In function `main':
/home/kadu/cvs/xorg_modular_source/app/ico/ico.c:1314: undefined 
reference to `pthread_create'
collect2: ld returned 1 exit status

where is declareted `pthread_create'... Anyone yet know how to resolve it?

Thanks,
Carlos.