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/usr/include/x86_64-linux-gnu/asm/ucontext.h is in linux-libc-dev 3.2.0-23.36.

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#ifndef _ASM_X86_UCONTEXT_H
#define _ASM_X86_UCONTEXT_H

#define UC_FP_XSTATE	0x1	/* indicates the presence of extended state
				 * information in the memory layout pointed
				 * by the fpstate pointer in the ucontext's
				 * sigcontext struct (uc_mcontext).
				 */

#include <asm-generic/ucontext.h>

#endif /* _ASM_X86_UCONTEXT_H */