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

make[4]: Entering directory '/openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/linux-5.4.159'
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/main.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/bind.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/crypto.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/ovpn.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/peer.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/sock.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/stats.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/netlink.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/crypto_none.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/crypto_aead.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/pktid.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/tcp.o
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/udp.o
  LD [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/ovpn-dco.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/ovpn-dco.mod.o
  LD [M]  /openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/ovpn-dco-2021-10-05-1017d4ad/drivers/net/ovpn-dco/ovpn-dco.ko
make[4]: Leaving directory '/openwrt/build_dir/target-mips_24kc_musl/linux-ath79_generic/linux-5.4.159'
Package kmod-ovpn-dco is missing dependencies for the following libraries:
aead.ko
ip6_udp_tunnel.ko
udp_tunnel.ko
make[3]: *** [Makefile:70: /openwrt/bin/targets/ath79/generic/packages/kmod-ovpn-dco_5.4.159+2021-10-05-1017d4ad-1_mips_24kc.ipk] Error 1