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diff --git a/ucontext.h b/ucontext.h
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+#ifndef __UCONTEXT_H__
+#define __UCONTEXT_H__
+
+/*
+UNG's Not GNU
+
+MIT License
+
+Copyright (c) 2011-2020 Jakob Kaivo <jkk@ung.org>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#if defined _XOPEN_SOURCE && !defined _POSIX_C_SOURCE
+#	if (_XOPEN_SOURCE >= 700)
+#		define _POSIX_C_SOURCE 200809L
+#	elif (_XOPEN_SOURCE >= 600)
+#		define _POSIX_C_SOURCE 200112L
+#	elif (_XOPEN_SOURCE >= 500)
+#		define _POSIX_C_SOURCE 199506L
+#	else
+#		define _POSIX_C_SOURCE 2
+#	endif
+#endif
+
+#if defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE
+#	define _POSIX_SOURCE
+#endif
+
+#if	(defined _XOPEN_SOURCE && ((defined _XOPEN_SOURCE_EXTENDED && _XOPEN_SOURCE_EXTENDED == 1) || 500 <= _XOPEN_SOURCE) && _XOPEN_SOURCE < 700)
+/* ./src/ucontext/mcontext_t.c */
+#ifndef __TYPE_mcontext_t_DEFINED__
+#define __TYPE_mcontext_t_DEFINED__
+typedef unsigned long mcontext_t;
+#endif
+
+/* ./src/ucontext/ucontext_t.c */
+#ifndef __TYPE_ucontext_t_DEFINED__
+#define __TYPE_ucontext_t_DEFINED__
+typedef struct ucontext_t {
+	struct ucontext_t * uc_link;
+	sigset_t uc_sigmask;
+	stack_t uc_stack;
+	mcontext_t uc_mcontext;
+} ucontext_t;
+#endif
+
+/* src/signal/sigset_t.c */
+#ifndef __TYPE_sigset_t_DEFINED__
+#define __TYPE_sigset_t_DEFINED__
+typedef unsigned int                                                   sigset_t;
+#endif
+
+/* src/signal/stack_t.c */
+#ifndef __TYPE_stack_t_DEFINED__
+#define __TYPE_stack_t_DEFINED__
+typedef struct {
+	void *ss_sp;	/* Stack base or pointer */
+	size_t ss_size;	/* Stack size */
+	int ss_flags;	/* Flags */
+} stack_t;
+#endif
+
+#endif
+
+#if	(defined _XOPEN_SOURCE && ((defined _XOPEN_SOURCE_EXTENDED && _XOPEN_SOURCE_EXTENDED == 1) || 500 <= _XOPEN_SOURCE) && _XOPEN_SOURCE < 700)
+/* ./src/ucontext/getcontext.c */
+int getcontext(ucontext_t *__ucp);
+/* ./src/ucontext/makecontext.c */
+void makecontext(ucontext_t *__ucp, void (*__func)(), int __argc, ...);
+/* ./src/ucontext/setcontext.c */
+int setcontext(const ucontext_t *__ucp);
+/* ./src/ucontext/swapcontext.c */
+void swapcontext(ucontext_t *__oucp, const ucontext_t *__ucp);
+#endif
+
+
+#endif