BEGIN {
    $ENV{ORACLE_HOME}="somepathto/oracle"; 
    $ENV{DYLD_LIBRARY_PATH}="somepathto/oracle/lib";
}

##</code><code>##

BEGIN{
    `export DYLD_LIBRARY_PATH=""`;
     `export ORACLE_HOME=""`;
    `export LD_LIBRARY_PATH=""`;

    $ENV{DYLD_LIBRARY_PATH}='';
    $ENV{ORACLE_HOME}=''
    $ENV{LD_LIBRARY_PATH}='';
}