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在Ubuntu下编译VLC源代码生成的VLC无法播放Youtube视频（比如https://www.youtube.com/watch?v=mDp-ABzpRX8）
错误提示如下：
zlf@ubuntu:~/vlc-2.1.5$ ./vlc VLC media player 2.1.5 Rincewind (revision 2.1.4-49-gdab6cb5) [0x9872a98] main libvlc: 正在以默认界面运行 vlc，使用 ‘cvlc‘ 将 vlc 运行在无界面的状态下。 [0x9931448] main tls client error: TLS client plugin not available [0xb5d034d8] main input error: open of `https://www.youtube.com/watch?v=mDp-ABzpRX8‘ failed
原因是缺少TLS客户端插件，因此需要将GNUTLS库编译进来。
下载GNUTLS库，最新版本3.3.12，configure时报错，缺少依赖库Libnettle，而且只能适配2.7.1，nettle3.0还不行。
zlf@ubuntu:~/gnutls-3.3.12$ ./configure --prefix=/usr configure: error: *** *** Libnettle 2.7.1 was not found. Note that this version of gnutls doesn‘t support nettle 3.0.
又去下载NETTLE库，编译安装，再运行GNUTLS的configure，NETTLE倒是检查通过，但依然报错，还需要HOGWEED库和GMP。
zlf@ubuntu:~/gnutls-3.3.12$ ./configure --prefix=/usr .................. checking for NETTLE... yes checking for HOGWEED... no configure: error: *** *** Libhogweed (nettle‘s companion library) was not found. Note that you must compile nettle with gmp support.
../lib/.libs/libgnutls.so: undefined reference to `nettle_umac96_set_key‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_salsa20_crypt‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac128_update‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac96_set_nonce‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_salsa20_set_key‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac128_set_nonce‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac128_set_key‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac96_digest‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_salsa20_set_iv‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac128_digest‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_salsa20r12_crypt‘ ../lib/.libs/libgnutls.so: undefined reference to `nettle_umac96_update‘ collect2: ld returned 1 exit status make[4]: *** [psktool] Error 1 make[4]: Leaving directory `/home/zlf/gnutls-3.3.12/src‘ make[3]: *** [all-recursive] Error 1 make[3]: Leaving directory `/home/zlf/gnutls-3.3.12/src‘ make[2]: *** [all] Error 2 make[2]: Leaving directory `/home/zlf/gnutls-3.3.12/src‘ make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/zlf/gnutls-3.3.12‘ make: *** [all] 错误 2
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原文地址：http://www.cnblogs.com/siikee/p/4272104.html
