Index: uspace/lib/posix/include/posix/assert.h
===================================================================
--- uspace/lib/posix/include/posix/assert.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/assert.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -1,1 +1,44 @@
+/*
+ * Copyright (c) 2018 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libposix
+ * @{
+ */
+
+#ifndef POSIX_ASSERT_H_
+#define POSIX_ASSERT_H_
+
+/*
+ * Just a pass-through to libc assert.
+ */
 #include "libc/assert.h"
+
+#endif
+
+/** @}
+ */
Index: uspace/lib/posix/include/posix/dirent.h
===================================================================
--- uspace/lib/posix/include/posix/dirent.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/dirent.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -36,5 +36,8 @@
 #define POSIX_DIRENT_H_
 
-#include <libc/dirent.h>
+/*
+ * Just a pass-through to libc dirent.
+ */
+#include "libc/dirent.h"
 
 #endif
Index: uspace/lib/posix/include/posix/errno.h
===================================================================
--- uspace/lib/posix/include/posix/errno.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/errno.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -1,1 +1,44 @@
+/*
+ * Copyright (c) 2018 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libposix
+ * @{
+ */
+
+#ifndef POSIX_ERRNO_H_
+#define POSIX_ERRNO_H_
+
+/*
+ * Just a pass-through to libc errno.
+ */
 #include "libc/errno.h"
+
+#endif
+
+/** @}
+ */
Index: uspace/lib/posix/include/posix/malloc.h
===================================================================
--- uspace/lib/posix/include/posix/malloc.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/malloc.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -33,5 +33,8 @@
 #define POSIX_MALLOC_H_
 
-/* Empty. Just to satisfy preprocessor. */
+/*
+ * Just a pass-through to libc malloc.
+ */
+#include "libc/malloc.h"
 
 #endif /* POSIX_MALLOC_H_ */
Index: uspace/lib/posix/include/posix/stdarg.h
===================================================================
--- uspace/lib/posix/include/posix/stdarg.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/stdarg.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -34,10 +34,8 @@
 #define POSIX_STDARG_H_
 
-typedef __builtin_va_list va_list;
-
-#define va_start(ap, last)  __builtin_va_start(ap, last)
-#define va_arg(ap, type)    __builtin_va_arg(ap, type)
-#define va_end(ap)          __builtin_va_end(ap)
-#define va_copy(dst, src)   __builtin_va_copy(dst, src)
+/*
+ * Just a pass-through to libc stdarg.
+ */
+#include "libc/stdarg.h"
 
 #endif
Index: uspace/lib/posix/include/posix/stdbool.h
===================================================================
--- uspace/lib/posix/include/posix/stdbool.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/stdbool.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -33,11 +33,11 @@
  */
 
-#ifndef POSIX_BOOL_H_
-#define POSIX_BOOL_H_
+#ifndef POSIX_STDBOOL_H_
+#define POSIX_STDBOOL_H_
 
-#define bool _Bool
-#define false  0
-#define true   1
-#define __bool_true_false_are_defined 1
+/*
+ * Just a pass-through to libc stdbool.
+ */
+#include "libc/stdbool.h"
 
 #endif
Index: uspace/lib/posix/include/posix/stddef.h
===================================================================
--- uspace/lib/posix/include/posix/stddef.h	(revision 3b1cc8d569aef3becba24699e6c65bbfc0ef5f78)
+++ uspace/lib/posix/include/posix/stddef.h	(revision e6bab27bb26fea43a9f90015a0d2429f8b6757db)
@@ -36,9 +36,8 @@
 #define POSIX_STDDEF_H_
 
-#include "sys/types.h"
-
-#include <_bits/NULL.h>
-
-#define offsetof(type,member) ((size_t) &(((type *) 0)->member))
+/*
+ * Just a pass-through to libc stddef.
+ */
+#include "libc/stddef.h"
 
 #endif /* POSIX_STDDEF_H_ */