Set the required environment variables.

export RTE_SDK=$DPDK_HOME/share/dpdk/
export RTE_TARGET=x86_64-native-linuxapp-gcc
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$RDK_HOME

Build Fastcapa. The resulting binary will be placed at build/app/fastcapa.

cd metron/metron-sensors/fastcapa
make