Linux error while loading shared libraries: cannot open shared object file

在安装了库之后，执行将会调用到该库的程序，出现异常 error while loading shared libraries ...

# ls /lib
ld-2.3.3.so         libdl-2.3.3.so      libpthread-0.10.so
ld-linux.so.2       libdl.so.2          libpthread.so.0
libc-2.3.3.so       libgcc_s.so         libpthread_rt.so
libc.so.6           libgcc_s.so.1       libstdc++.so.6
libcrypt-2.3.3.so   libm-2.3.3.so       libstdc++.so.6.0.9
libcrypt.so.1       libm.so.6
# ./clocktest
./clocktest: error while loading shared libraries: libpthread_rt.so.1: cannot open shared object file: No such file or directory

解决方法：  

#sudo ldconfig