<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_f08_to_env(env):
 """Add Builders and construction variables for f08 to an Environment."""

    try:
        F08Suffixes = env['F08FILESUFFIXES']
    except KeyError:
        F08Suffixes = ['.f08']

    try:
        F08PPSuffixes = env['F08PPFILESUFFIXES']
    except KeyError:
        F08PPSuffixes = []

    DialectAddToEnv(env, "F08", F08Suffixes, F08PPSuffixes,
                    support_module = 1)