Missing -lpthread ?

[hcchin]

    I am using slackware 3.4, so I assume that I am using glibc 5.0, am I 
right?

    I have some problem with compiling the program(openlink client) with 
-lpthread option it shows:

/usr/i486-unknown-linux-gnulibc1/bin/ld: cannot open -lpthread: No such 
file or directory

    I am running 2.0.36 + gcc 2.7.2, does glibc 5.0 support pthread?