#!/usr/bin/perl
BEGIN {
 $ENV{LD_LIBRARY_PATH} = "/usr/local/gsl-1/lib" ;
 exec $0, '--restarted', @ARGV ;
 } ;

require Math::GSL ;
use strict;
use warnings;
print $ENV{LD_LIBRARY_PATH}, "\n";
[download]

 Can't load '/usr/lib/perl5/vendor_perl/auto/Math/GSL/Errno/Errno.so' 
+for module Math::GSL::Errno: libgsl.so.0: cannot open shared object f
+ile: No such file or directory at /usr/lib/perl5/DynaLoader.pm line 1
+93. at /usr/lib/perl5/vendor_perl/Math/GSL/Errno.pm line 11.
Compilation failed in require at /usr/lib/perl5/vendor_perl/Math/GSL/T
+est.pm line 7.
BEGIN failed--compilation aborted at /usr/lib/perl5/vendor_perl/Math/G
+SL/Test.pm line 7.
Compilation failed in require at /usr/lib/perl5/vendor_perl/Math/GSL.p
+m line 10.
BEGIN failed--compilation aborted at /usr/lib/perl5/vendor_perl/Math/G
+SL.pm line 10.
Compilation failed in require at ./test.pl line 10.
[download]

This is higly weird because I would expect that code to go into an endless self-exec loop instead of producing that error message. You never check for the self-restart flag.

Maybe consider adding more debug output, for example two print statements around the exec statement:

...
    print "Rerunning $0 --restarted @ARGV\n";
    exec $0, '--restarted', @ARGV
        or print STDERR "couldn't exec foo: $!";
...
[download]

Also, if you put your code in between <code>...</code> tags, it renders and downloads much better.

Rerunning ./test.pl --restarted --restarted --restarted --restarted --restarted --restarted --restarted --restarted --restarted --restarted --restarted --restarted -

Patrick Dupre Universite du Littoral, FR Dunkirk