gnutls库版本过低

[tzhang-dev]

贡献者你好,发现 Dockerfile 在构建时会报如下错误:

checking for LIBNETTLE... yes
checking for LIBGNUTLS... no
configure: error: Package requirements (gnutls >= 3.3.0) were not met:

Requested 'gnutls >= 3.3.0' but version of GnuTLS is 3.2.11
You may find new versions of GnuTLS at http://www.gnutls.org/

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables LIBGNUTLS_CFLAGS
and LIBGNUTLS_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

应该是新版本的 ocserv 要求了更高版本的 GnuTLs 导致的. ubuntu:trusty 的 apt 提供的GnuTLs版本是2.9.x

把使用的 ubuuntu 镜像换成 latest 就可以正常构建了(version 3.6)