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diff --git a/common/mischelp.h b/common/mischelp.h
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+++ b/common/mischelp.h
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+/* mischelp.h - Miscellaneous helper macros and functions
+ * Copyright (C) 1999, 2000, 2001, 2002, 2003,
+ *               2006, 2007, 2009  Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute and/or modify this
+ * part of GnuPG under the terms of either
+ *
+ *   - the GNU Lesser General Public License as published by the Free
+ *     Software Foundation; either version 3 of the License, or (at
+ *     your option) any later version.
+ *
+ * or
+ *
+ *   - the GNU General Public License as published by the Free
+ *     Software Foundation; either version 2 of the License, or (at
+ *     your option) any later version.
+ *
+ * or both in parallel, as here.
+ *
+ * GnuPG is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copies of the GNU General Public License
+ * and the GNU Lesser General Public License along with this program;
+ * if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef GNUPG_COMMON_MISCHELP_H
+#define GNUPG_COMMON_MISCHELP_H
+
+
+/* Check whether the files NAME1 and NAME2 are identical.  This is for
+   example achieved by comparing the inode numbers of the files.  */
+int same_file_p (const char *name1, const char *name2);
+
+
+#ifndef HAVE_TIMEGM
+#include <time.h>
+time_t timegm (struct tm *tm);
+#endif /*!HAVE_TIMEGM*/
+
+
+#define DIM(v)		     (sizeof(v)/sizeof((v)[0]))
+#define DIMof(type,member)   DIM(((type *)0)->member)
+
+/* To avoid that a compiler optimizes certain memset calls away,
+   wipememory function may be used instead.  */
+void wipememory(void *ptr, size_t len);
+
+/* Include hacks which are mainly required for Slowaris.  */
+#ifdef GNUPG_COMMON_NEED_AFLOCAL
+#ifndef HAVE_W32_SYSTEM
+# include <sys/socket.h>
+# include <sys/un.h>
+#else
+# ifdef HAVE_WINSOCK2_H
+#  include <winsock2.h>
+# endif
+# include <windows.h>
+#endif
+
+#ifndef PF_LOCAL
+# ifdef PF_UNIX
+#  define PF_LOCAL PF_UNIX
+# else
+#  define PF_LOCAL AF_UNIX
+# endif
+#endif /*PF_LOCAL*/
+#ifndef AF_LOCAL
+# define AF_LOCAL AF_UNIX
+#endif /*AF_UNIX*/
+
+/* We used to avoid this macro in GnuPG and inlined the AF_LOCAL name
+   length computation directly with the little twist of adding 1 extra
+   byte.  It seems that this was needed once on an old HP/UX box and
+   there are also rumours that 4.3 Reno and DEC systems need it.  This
+   one-off buglet did not harm any current system until it came to Mac
+   OS X where the kernel (as of May 2009) exhibited a strange bug: The
+   systems basically froze in the connect call if the passed name
+   contained an invalid directory part.  Ignore the old Unices.  */
+#ifndef SUN_LEN
+# define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+	               + strlen ((ptr)->sun_path))
+#endif /*SUN_LEN*/
+#endif /*GNUPG_COMMON_NEED_AFLOCAL*/
+
+
+#endif /*GNUPG_COMMON_MISCHELP_H*/