The generated env.sh contains settings like this:
export PATH=/home/user/testing-envire-envire_core/install/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
while it should better be
export PATH=/home/user/testing-envire-envire_core/install/bin:$PATH
The generated env.sh contains settings like this: export PATH=/home/user/testing-envire-envire_core/install/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
while it should better be export PATH=/home/user/testing-envire-envire_core/install/bin:$PATH