libpthread.so.0 => not found

系统缺少libpthread.so这个文件，是什么原因，要安装什么软件么？ 求方法、、、
[root@VMN233 opt]# ldd ZenTaoPMS.4.1.stable.linux.7z
        linux-gate.so.1 =>  (0xffffe000)
        libpthread.so.0 => not found
        libstdc++.so.6 => /lib/libstdc++.so.6 (0xf7e25000)
        libm.so.6 => /lib/libm.so.6 (0x00bbd000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00ad1000)
        libc.so.6 => /lib/libc.so.6 (0xf7cde000)
        /lib/ld-linux.so.2 (0x00a37000)

yum install glibc

http:-//mirror.centos.-org/centos/5/updates/i386/RPMS/glibc-2.5-107.el5_9.4.i686.rpm