OG_MULTIARG_ITEM([bufpos], [bufpos], [checks on buffer position])
OG_MULTIARG_ITEM([glyphs], [glyphs], [checks on glyph data])
OG_MULTIARG_ITEM([stack], [stack], [checks on stack barriers])
+ OG_MULTIARG_ITEM([malldbg], [malldbg], [malloc debugging code])
])
OG_ARG_WITH([purify],