Instaling PGPLOT the install gets stopped for ever here:
$ cpanm PGPLOT
--> Working on PGPLOT
Fetching http://www.cpan.org/authors/id/K/KG/KGB/PGPLOT-2.21.tar.gz ... OK
Configuring PGPLOT-2.21 ... OK
Building and testing PGPLOT-2.21 ...
Looking at the Build.log seems that it is waiting for a prompt answer
$ tail ~/.cpanm/build.log
-L/usr/lib -L/usr/local/lib -lcpgplot -lpgplot -lX11 -lpng -L/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/lib -lgfortran -lm \
chmod 755 blib/arch/auto/PGPLOT/PGPLOT.so
cp PGPLOT.bs blib/arch/auto/PGPLOT/PGPLOT.bs
chmod 644 blib/arch/auto/PGPLOT/PGPLOT.bs
Manifying blib/man3/PGPLOT.3
make: warning: Clock skew detected. Your build may be incomplete.
make: Warning: File `Makefile' has modification time 3e+02 s in the future
PERL_DL_NONLAZY=1 /home/pmg/perl5/perlbrew/perls/perl-5.16.0/bin/perl "-Iblib/lib" "-Iblib/arch" test.pl
Default Device for plot tests [recommend /XSERVE] ?
How can I avoid this question either forcing defaults or given the option through env. vars?
[UPDATE] FIX
From the Russell answer I exported the variable for device
export PGPLOT_DEV=/XSERVE; cpanm PGPLOT
And connected with x11vnc to the server (to the main display) for closing all windows the pgplot test was displaying.
[NOTE] don't try to install pgplot perl lib under screen even with ssh -X, chances are that you are not in the same computer you starter your original screen and the X redirection will not work. You can circumvent that limitation with a vnc connection to main display or you will not being able to finish the installation. xrdp and other vnc that open a new session will not work. You need to share the main display.
From reading test.pl in the distribution, it checks the PGPLOT_DEV environment variable. It looks like the valid values are /XSERVE for Unix/Linux and /PNG for Windows.