my $HAVE_Capture_Tiny = 0;
eval "use Capture::Tiny qw(capture)";
if ( !$@ ) {
    $HAVE_Capture_Tiny = 1;
}

...

if ( $HAVE_Capture_Tiny ) {
    my $c = Capture::Tiny->new( ... );
} else {
   ## fallback if not have Capture::Tiny
} 

##</code><code>##

use strict;
use warnings;

# Instead of:
#
# use Module::Name 1.00 qw(:subs);
#
# do this:
my $HAVE_Module_Name;
BEGIN {
    $HAVE_Module_Name = eval {
        require Module::Name;
        Module::Name->VERSION( 1.00 );
        Module::Name->import( qw ( :subs ) );
        1;
    };
}

if ($HAVE_Module_Name) {
    print "Module::Name = $Module::Name::VERSION\n";
} else {
    print "Module::Name = [NOT INSTALLED]\n";
}