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

Applying ./patches/01_fix_nf_hooks.patch using plaintext: 
patching file kernelmod/main.c

Applying ./patches/02-mrm_ctlfile.c-compatibility-with-linux-5.6.patch using plaintext: 
patching file kernelmod/mrm_ctlfile.c
make[4]: Entering directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod'
make -C /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/linux-4.19.214 M=/openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod modules
make[5]: Entering directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/linux-4.19.214'
  CC [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/mrm_rcdb.o
  CC [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/mrm_runconf.o
  CC [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/mrm_ctlfile.o
  CC [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/main.o
  CC [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/filter_config_accelerator.o
  LD [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/macremapper.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/macremapper.mod.o
  LD [M]  /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/macremapper.ko
/openwrt/staging_dir/toolchain-aarch64_cortex-a72_gcc-8.4.0_musl/bin/aarch64-openwrt-linux-musl-ld: cannot open linker script file ./arch/arm64/kernel/module.lds: No such file or directory
make[6]: *** [scripts/Makefile.modpost:129: /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod/macremapper.ko] Error 1
make[5]: *** [Makefile:1548: modules] Error 2
make[5]: Leaving directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/linux-4.19.214'
make[4]: *** [Makefile:71: all] Error 2
make[4]: Leaving directory '/openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/kernelmod'
make[3]: *** [Makefile:46: /openwrt/build_dir/target-aarch64_cortex-a72_musl/linux-bcm27xx_bcm2711/macremapper-1.1.0/.built] Error 2