Accessing system environment variable from Slick-C

[jkwuc89]

I have a _command definition inside vusrmacs.e where I want to access the value of a system environment variable.  Below is the actual code I am using.  Unfortunately, it does not work.  dir gets set to the string "GISCLUMPDIR" instead of this environment variable's value.  How do I access a system environment variable from within Slick-C?

_command void sandbox() {
    dir = ENV_ARG( "GISCLUMPDIR" )
    messageNwait("GISCLUMPDIR = " :+ dir)
    cdd( dir );
}

[hs2]

Try get_env( 'GISCLUMPDIR' )
BTW: There is also a set_env( 'GISCLUMPDIR', 'NEW_DIR' );
Good luck, HS2