+ # it's easy to miss dVAR
+ - CONFIGURE_ARGS='-DPERL_GLOBAL_STRUCT_PRIVATE'
+ # test scripts can be sensitive to PERL_UNICODE, and check long doubles
+ - CONFIGURE_ARGS='-Duseshrplib -Dusesitecustomize -Duselongdouble' PERL_UNICODE='' LANG='en_US.UTF-8'
+ # we've rarely had a problem with non-Englush locales, and exercise quadmath
+ - CONFIGURE_ARGS='-Duseshrplib -Dusequadmath -Dusecbacktrace -Dusethreads' PERL_UNICODE='' LANG='de_DE.UTF-8'