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require Exporter;
@ISA = qw(Exporter);
...
sub fun2{print "\nfun2";}
sub fun3{print "\nfun3";}
sub fun4{print "\nfun4";}

use Module;
fun1;
fun2;
fun3;
fun4;

require Exporter;
@ISA = qw(Exporter); 
@EXPORT =qw\fun1 fun2\; 
@EXPORT_OK = qw\fun3\;
@EXPORT_FAIL= qw\fun4\;