ubuntu 20.04 build android arm64 use ndk21 meer error

i use this command build arm64

./cerbero-uninstalled -c config/cross-android-arm64.cbc package gstreamer-1.0

meet error in openssl cross compile

Running command 'sh -c 'perl ./Configure --prefix=~/cerbero/build/dist/android_arm64 --libdir=lib no-makedepend shared android-arm64'' no NDK aarch64-linux-android-gcc on $PATH at (eval 10) line 124. Configuring OpenSSL version 1.1.1h (0x1010108fL) for android-arm64 Using os-specific seed configuration