Error using "make" step if PREFIX environment variable is set

[jerryvurbl]

$ make

./pinata-build-sshd.sh: line 3: cd: /usr/local/share/pinata-ssh-agent: No such file or directory

The issue is that
./pinata-build-sshd.sh
hardcodes the PREFIX path to /usr/local instead of uses Env var PREFIX as done in the Makefile

[jerryvurbl]

#21