All symbols starting with `o' in src

• O_BINARY src/m_misc.c:110
• okay src/changelog:88
• once src/p_spec.h:244
• one src/r_segs.c:198
• OOP src/doomdef.h:109
• openbottom src/p_local.h:170
• openrange src/p_local.h:171
• opentop src/p_local.h:169
• optional src/w_wad.c:126
• or src/p_maputl.c:108
• org src/readme.b:20
• orientation src/r_draw.c:491
• Otherwise src/s_sound.c:751
• overflowsprite src/r_things.c:327