Within ecflow there are many scripts. Many of these scripts rely on environment variables.   

WK

export WK=<root source path ecflow>

This is used cmake.sh  and build_scripts/nightly/quick_install.sh

cmake.sh

This script is used to build ecflow on linux and relies on the module system

cd $WK
./cmake.sh clean make -j8         # start with a clean build, and make -j8
./cmake.sh clean make -j8 install # build and install,
./cmake.sh debug make -j8         # build a debug version