docker pull elonh/opde:sdk
docker run -it --rm elonh/opde:sdk zsh # or bash
export http_proxy= # [your proxy], do not use localhost or 127.0.0.1
export https_proxy=$http_proxy
opde feeds && opde config -a
make package/feeds/packages/ocserv/compile -j$(nproc) || make package/feeds/packages/ocserv/compile V=s

configure: WARNING: unrecognized options: --disable-nls
configure: loading site script /openwrt/include/site/mips
checking pkg-config is at least version 0.9.0... yes
checking for a BSD-compatible install... /openwrt/staging_dir/host/bin/install -c
checking whether build environment is sane... yes
checking for mips-openwrt-linux-strip... mips-openwrt-linux-musl-strip
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for mips-openwrt-linux-gcc... ccache_cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether ccache_cc accepts -g... yes
checking for ccache_cc option to accept ISO C89... none needed
checking whether ccache_cc understands -c and -o together... yes
checking whether make supports the include directive... yes (GNU style)
checking dependency style of ccache_cc... gcc3
checking how to run the C preprocessor... ccache_cc -E
checking for grep that handles long lines and -e... /openwrt/staging_dir/host/bin/grep
checking for egrep... /openwrt/staging_dir/host/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking whether _XOPEN_SOURCE should be defined... no
checking for Minix Amsterdam compiler... no
checking for mips-openwrt-linux-ar... mips-openwrt-linux-musl-gcc-ar
checking the archiver (mips-openwrt-linux-musl-gcc-ar) interface... ar
checking for mips-openwrt-linux-ar... (cached) mips-openwrt-linux-musl-gcc-ar
checking for _LARGEFILE_SOURCE value needed for large files... no
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking for mips-openwrt-linux-ar... (cached) mips-openwrt-linux-musl-gcc-ar
checking the archiver (mips-openwrt-linux-musl-gcc-ar) interface... (cached) ar
checking for a sed that does not truncate output... /openwrt/staging_dir/host/bin/sed
checking for ctags... :
checking for cscope... :
checking for ronn... :
configure: WARNING:
***
*** ronn (ruby-ronn) was not found. Will not be able to generate manpages
*** 
checking whether to enable maintainer-specific portions of Makefiles... yes
checking whether to build with code coverage support... no
checking for sighandler_t... yes
checking for sig_t... yes
checking for __sighandler_t... no
checking for struct ucred... yes
checking for struct iphdr.ihl... yes
checking size of unsigned long... (cached) 4
checking whether byte ordering is bigendian... (cached) yes
checking for nettle >= 2.7... yes
checking for gnutls >= 3.3.0... no
configure: error: Package requirements (gnutls >= 3.3.0) were not met:

Package 'gnutls', required by 'virtual:world', not found

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.
make[3]: *** [Makefile:117: /openwrt/build_dir/target-mips_24kc_musl/ocserv-1.1.3/.configured_34480a98ce610c293bc615af599901ca] Error 1