INCOMPAT_USES_EV_HOOK

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If your program is a TSR that hooks events (see EV_hook), you should write

#define INCOMPAT_USES_EV_HOOK
at the top of at least one source file, before including any header file from the TIGCC Library. If this directive is not used, a shell might automatically remove the event hook, rendering the TSR useless. Or it might even just free other resources allocated by the program, causing a crash.