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#ifdef EXTERNAL_BUILD
#ifndef ARG_BUILD
#error "External is build but arg_build is not set."
#elif defined(ARG_HOST)
#error "External is build but arg_host is set."
#else
#define GOT BUILD
#endif
#endif
#ifdef EXTERNAL_HOST
#ifndef ARG_HOST
#error "External is host but arg_host is not set."
#elif defined(ARG_BUILD)
#error "External is host but arg_build is set."
#else
#define GOT HOST
#endif
#endif
#if defined(EXTERNAL_BUILD) && defined(EXTERNAL_HOST)
#error "Both external build and external host set."
#endif
#if !defined(EXTERNAL_BUILD) && !defined(EXTERNAL_HOST)
#error "Neither external build nor external host is set."
#endif
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