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diff --git a/semaphore.h b/semaphore.h
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+#ifndef __SEMAPHORE_H__
+#define __SEMAPHORE_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 _POSIX_C_SOURCE && 199309 <= _POSIX_C_SOURCE)
+/* ./src/semaphore/sem_t.c */
+#ifndef __TYPE_sem_t_DEFINED__
+#define __TYPE_sem_t_DEFINED__
+typedef struct __sem_t                                                    sem_t;
+#endif
+
+#endif
+
+#if (!defined __STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
+#define restrict
+#endif
+
+#if	(defined _POSIX_C_SOURCE && 199309 <= _POSIX_C_SOURCE)
+/* ./src/semaphore/sem_close.c */
+int sem_close(sem_t *__sem);
+/* ./src/semaphore/sem_destroy.c */
+int sem_destroy(sem_t * __sem);
+/* ./src/semaphore/sem_getvalue.c */
+int sem_getvalue(sem_t * restrict __sem, int * restrict __sval);
+/* ./src/semaphore/sem_init.c */
+int sem_init(sem_t * __sem, int __pshared, unsigned __value);
+/* ./src/semaphore/sem_open.c */
+sem_t * sem_open(const char * __name, int __oflag, ...);
+/* ./src/semaphore/sem_post.c */
+int sem_post(sem_t * __sem);
+/* ./src/semaphore/sem_trywait.c */
+int sem_trywait(sem_t * __sem);
+/* ./src/semaphore/sem_unlink.c */
+int sem_unlink(const char * __name);
+/* ./src/semaphore/sem_wait.c */
+int sem_wait(sem_t * __sem);
+#endif
+
+
+#endif