NSIS: use environment variable at compile time?

Question

If I am not mistaken, all discussions of environment variables (EV) in NSIS docs (for example, ReadEnvStr ), deal with EVs on the target computer: everything happens with the installation .

I wonder if there is support for using EV on the developer's machine (assembly) in compilation . In particular, suppose I have

 !define SRCDIR "C:\progs\version1\src" ... File /r "${SRCDIR}\*.*" 

and I would rather write

 !define SRCDIR "%{PROG_DIR}\src" 

(or something similar), where PROG_DIR is an environment variable. It can be done?

Answer 1

 !echo "$%temp%" 

I am sure this is documented somewhere.