#!/usr/bin/perl --
BEGIN {
    unless( eval { require Inline::MakeMaker; 1; }  ){
        warn "Warning: prerequisite Inline::MakeMaker 0 not found.\n";
        exit 0;
    }
}
##</code><code>##

#!/usr/bin/perl --
use ExtUtils::MakeMaker();
if(
    eval {
        require Inline::MakeMaker;
        1;
    }
) {
    *WriteMakefile = \Inline::MakeMaker::WriteMakefile;
} else {
    *WriteMakefile = \&ExtUtils::MakeMaker::WriteMakefile;
}


WriteMakefile(
...
    PREREQ_PM         => {
        'Inline::CPP' => 0.33,
        'Inline::MakeMaker' => 0,
        ...
    },
)