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=$http_proxy
opde feeds && opde config -a
make package/feeds/packages/pcap-dnsproxy/compile -j$(nproc) || make package/feeds/packages/pcap-dnsproxy/compile V=s

Applying ./patches/002-cmake-dependency-scanner-workaround.patch using plaintext: 
patching file Source/Pcap_DNSProxy/Platform.h
Hunk #1 succeeded at 380 with fuzz 1 (offset 1 line).
Hunk #2 succeeded at 394 (offset 1 line).
Hunk #3 succeeded at 572 (offset -3 lines).
CMake Warning (dev) in CMakeLists.txt:
  No project() command is present.  The top-level CMakeLists.txt file must
  contain a literal, direct call to the project() command.  Add a line of
  code such as

    project(ProjectName)

  near the top of the file, but after cmake_minimum_required().

  CMake is pretending there is a "project(Project)" command on the first
  line.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- The C compiler identification is GNU 8.4.0
-- The CXX compiler identification is GNU 8.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /openwrt/staging_dir/toolchain-mips_24kc_gcc-8.4.0_musl/bin/mips-openwrt-linux-musl-gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /openwrt/staging_dir/toolchain-mips_24kc_gcc-8.4.0_musl/bin/mips-openwrt-linux-musl-g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
CMake Error at /openwrt/staging_dir/host/share/cmake-3.20/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
  system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY
  OPENSSL_INCLUDE_DIR)
Call Stack (most recent call first):
  /openwrt/staging_dir/host/share/cmake-3.20/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
  /openwrt/staging_dir/host/share/cmake-3.20/Modules/FindOpenSSL.cmake:570 (find_package_handle_standard_args)
  Source/Pcap_DNSProxy/CMakeLists.txt:146 (find_package)


-- Configuring incomplete, errors occurred!
See also "/openwrt/build_dir/target-mips_24kc_musl/pcap-dnsproxy-0.4.9.13-2019-05-05-bc9f540d/CMakeFiles/CMakeOutput.log".
make[3]: *** [Makefile:155: /openwrt/build_dir/target-mips_24kc_musl/pcap-dnsproxy-0.4.9.13-2019-05-05-bc9f540d/.configured_f08c297bdefef8a733ce3a88d97450f9] Error 1