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

The Meson build system
Version: 0.57.2
Source dir: /openwrt/build_dir/target-aarch64_cortex-a72_musl/jsoncpp-1.9.4
Build dir: /openwrt/build_dir/target-aarch64_cortex-a72_musl/jsoncpp-1.9.4/openwrt-build
Build type: cross build
WARNING: Unknown options: "build.libdir, build.prefix, build.sbindir"
The value of new options can be set with:
meson setup <builddir> --reconfigure -Dnew_option=new_value ...
Project name: jsoncpp
Project version: 1.9.4
C++ compiler for the host machine: ccache_cxx (gcc 8.4.0 "aarch64-openwrt-linux-musl-g++ (OpenWrt GCC 8.4.0 r0-af265d3) 8.4.0")
C++ linker for the host machine: ccache_cxx ld.bfd 2.34
C++ compiler for the build machine: g++ (gcc 9.3.0 "g++ (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0")
C++ linker for the build machine: g++ ld.bfd 2.34
Build machine cpu family: x86_64
Build machine cpu: x86_64
Host machine cpu family: aarch64
Host machine cpu: generic
Target machine cpu family: aarch64
Target machine cpu: generic
Build targets in project: 1

Option buildtype is: plain [default: release]

ERROR: Could not detect Ninja v1.8.2 or newer

A full log can be found at /openwrt/build_dir/target-aarch64_cortex-a72_musl/jsoncpp-1.9.4/openwrt-build/meson-logs/meson-log.txt
make[3]: *** [Makefile:73: /openwrt/build_dir/target-aarch64_cortex-a72_musl/jsoncpp-1.9.4/.configured_68b329da9893e34099c7d8ad5cb9c940] Error 1