sine+scope example not working

[Raul Herrera]

Hi all.
When i try to compile the sci block I get:

gcc -static -o ../Untitled  rtmain.o Untitledc.o
/usr/local/scilab-4.0/libs/scicos.a
/usr/local/scilab-4.0/libs/lapack.a /usr/local/scilab-4.0/libs/poly.a
/usr/local/scilab-4.0/libs/calelm.a /usr/local/scilab-4.0/libs/blas.a
/usr/local/scilab-4.0/libs/lapack.a /usr/realtime/lib/libsciblk.a
/usr/realtime/lib/liblxrt.a -lpthread -lm
/usr/bin/ld: cannot find -lpthread
collect2: ld returned 1 exit status
make: *** [../Untitled] Error 1

the file libpthread.so is in fact in /usr/lib

my relevant dmesg:
I-pipe: Domain RTAI registered.
RTAI[hal]: <3.3> mounted over IPIPE-NOTHREADS 1.2-00.
RTAI[hal]: compiled with gcc version 3.3.1 (Mandrake Linux 9.2 3.3.1-2mdk).
RTAI[hal]: mounted (IPIPE-NOTHREADS, IMMEDIATE (INTERNAL IRQs DISPATCHED),
ISOL_CPUS_MASK: 0).
dcac6500 9ac15d93 RTAI 200
RTAI[malloc]: vmalloced extent dcafc000, size 2097152.
RTAI[malloc]: loaded (global heap size=2097152 bytes).
RTAI[sched_lxrt]: loaded (IMMEDIATE, UP, USER/KERNEL SPACE <with RTAI
TASKs>).
RTAI[sched_lxrt]: hard timer type/freq = APIC/8332000(Hz); default timing
mode is periodic; linear ordering of timed lists.
RTAI[sched_lxrt]: Linux timer freq = 1000 (Hz), CPU freq = 3201508000 hz.
RTAI[sched_lxrt]: timer setup = 999 ns, resched latency = 2943 ns.
RTAI[leds]: loaded.
RTAI_SIGNALS: loaded.
RTAI[tasklets]: loaded.

my relevant lsmod:
rtai_tasklets          10372  0
rtai_signal             5120  0
rtai_leds               2956  0
rtai_shm                9472  0
rtai_netrpc            21748  0
rtai_msg               19968  0
rtai_mbx               10752  1 rtai_netrpc
rtai_sem               16256  2 rtai_netrpc,rtai_mbx
rtai_fifos             26828  0
rtai_up                76824  8
rtai_tasklets,rtai_signal,rtai_shm,rtai_netrpc,rtai_msg,rtai_mbx,rtai_sem,rtai_fifos
rtai_hal               62816  9
rtai_tasklets,rtai_signal,rtai_shm,rtai_netrpc,rtai_msg,rtai_mbx,rtai_sem,rtai_fifos,rtai_up

my PATH:
/sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin:/usr/realtime/bin

my /etc/ld.so.conf:
include /etc/ld.so.conf.d/*.conf
/usr/X11R6/lib
/usr/lib/qt3/lib
/usr/local/lib
/usr/lib
/usr/realtime/lib

why is this happening? solution?
Thank you very much in advance.
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