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$MakeMain = 'javac ' . $java_opt . ' ' . $class_dir . 
   '\comm\client\Main.java';

$MakeMain = "javac $java_opt $class_dir\\comm\\client\\Main.java";

@MakeMain = ('javac', 
             $java_opt,
             $class_dir.'\comm\clients\Main.java');
system(@MakeMain);