check library dependency for specific applications

If the libraries appear to be correct, then verify that the application is using the correct libraries. For example, to check that the application /usr/X11R6/bin/glxgears is using the NVIDIA libraries, run: % ldd /usr/X11R6/bin/glxgears
linux-gate.so.1 => (0xffffe000)
libGL.so.1 => /usr/lib/libGL.so.1 (0xb7ed3000)
libXp.so.6 => /usr/lib/libXp.so.6 (0xb7eca000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xb7eb9000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xb7dd4000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7d82000)
libm.so.6 => /lib/libm.so.6 (0xb7d5f000)
libc.so.6 => /lib/libc.so.6 (0xb7c47000)
libGLcore.so.1 => /usr/lib/libGLcore.so.1 (0xb6c2f000)
libnvidia-tls.so.1 => /usr/lib/tls/libnvidia-tls.so.1 (0xb6c2d000)
libdl.so.2 => /lib/libdl.so.2 (0xb6c29000)
/lib/ld-linux.so.2 (0xb7fb2000)
Check the files being used for libGL and libGLcore -- if they are something other than the NVIDIA libraries, then you will need to either remove the libraries that are getting in the way or adjust your ld search path using the LD_LIBRARY_PATH environment variable. You may want to consult the man pages for ldconfig and ldd.