Howto Compile libndpi on OpenWRT
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cd myopenwrt_directory
mkdir package/network/services/libndpi
cd package/network/services/libndpi

# (a) Stable version
ln -s ~/nDPI/packages/openwrt/Makefile .

# (b) Dev version
cp ~/nDPI/packages/openwrt/Makefile.dev Makefile

cd myopenwrt_directory
make menuconfig

Go under libraries and select

<M> libndpi.............................. nDPI Deep Packet Inspection Library


Build Commands
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If you want to build just libndpi do:
make -j1 V=s package/network/services/libndpi/clean
make -j1 V=s package/network/services/libndpi/compile

Other Documents
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https://openwrt.org/packages/pkgdata/libndpi