root@server [/usr/local/src/ffmpeg]# ./configure --prefix=/usr/local/bin --enable-mp3lame --enable-x264 --enable-gpl
ERROR: x264 not found
If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-devel@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.err" produced by configure as this will help
solving the problem.

root@server [/usr/local/src]# rpm -i x264-0.0.0-0.3.20061023.el4.rf.x86_64.rpm
warning: x264-0.0.0-0.3.20061023.el4.rf.x86_64.rpm: V3 DSA signature: NOKEY, key ID 6b8d79e6
error: Failed dependencies:
        libc.so.6()(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64
        libc.so.6(GLIBC_2.2.5)(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64
        libc.so.6(GLIBC_2.3.4)(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64
        libm.so.6()(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64
        libm.so.6(GLIBC_2.2.5)(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64
        libpthread.so.0()(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64
        libpthread.so.0(GLIBC_2.2.5)(64bit) is needed by x264-0.0.0-0.3.20061023.el4.rf.x86_64