RE: use lib - not known at compile time

From: John Moon (john.moon_at_myflorida.com)
Date: 07/29/04 

To: "'Thompson, Glenn'" <gtho@bgs.ac.uk>, beginners@perl.org
Date: Thu, 29 Jul 2004 11:02:50 -0400

You may wish to look at "BEGIN" ...

Hope that gives you some ideas...

Thanks,

jwm

-----Original Message-----
From: Thompson, Glenn [mailto:gtho@bgs.ac.uk]
Sent: Thursday, July 29, 2004 10:54 AM
To: beginners@perl.org
Subject: use lib - not known at compile time

I'm trying to add my own module "DEGS::ldegs" to a Perl program.
However, this module will part of a distribution called "RGSE",
which could be installed on a different path on different peoples PCs.
However, it will always be in the directory "$ENV{RGSE}/lib".

The problem is when I run the program I get an error like:

"Empty compile time value given to use lib at /home/gtho/Rgse/bin/depsol-gmt
line 44"

This presumably is because "use lib" cannot be used on a variable that is
undefined at compile time.

Now I know I can run the program in the following way:
        perl -I$ENV{RGSE}/lib myprogram.pl

which could easily be put in a wrapper shell script.

But is there anyway of avoiding this, and have "use lib" work on $ENV{RGSE}
"dynamically"?
Hopefully I'm missing something really simple here!

Here is a snippet from the program:

        use lib "$ENV{RGSE}/lib"; # directory when DEGS::ldegs is contained

        # Read necessary Perl libraries
        use DEGS::ldegs qw(&wait_for_enter &run &pythag &minmax &get_obj
&get_y_limits
                        &page_get_size &set_tick_interval &add_legend
&get_lim2
                        &page_setup_gm &add_fold_points);

Thanks,

Cheetah

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