How to compile native programs for use in openwrt
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1) Download latest SDK for your platform from https://downloads.openwrt.org

examples :

curl -o - https://downloads.openwrt.org/releases/23.05.5/targets/x86/64/openwrt-sdk-23.05.5-x86-64_gcc-12.3.0_musl.Linux-x86_64.tar.xz | tar -Jxvf -
cd openwrt-sdk-23.05.5-x86-64_gcc-12.3.0_musl.Linux-x86_64

curl -o - https://downloads.openwrt.org/snapshots/targets/x86/64/openwrt-sdk-x86-64_gcc-13.3.0_musl.Linux-x86_64.tar.zst | tar --zstd -xvf -
cd openwrt-sdk-x86-64_gcc-13.3.0_musl.Linux-x86_64

2) Install required libs

./scripts/feeds update base packages
./scripts/feeds install libnetfilter-queue zlib libcap

3) Prepare openwrt package definitions

cp -R /opt/zapret/docs/compile/openwrt/. .
cp -R /opt/zapret/tpws package/zapret/tpws
cp -R /opt/zapret/nfq package/zapret/nfqws
cp -R /opt/zapret/mdig package/zapret/mdig
cp -R /opt/zapret/ip2net package/zapret/ip2net
rm -f package/zapret/tpws/tpws/tpws package/zapret/nfqws/nfq/nfqws package/zapret/mdig/mdig/mdig package/zapret/ip2net/ip2net/ip2net

4) Compile

make package/{tpws,nfqws,mdig,ip2net}/compile

5) Get result

ls -l bin/packages/*/base
# take your ipk or apk from there
# zlib-dev is not required