diff --git a/libasn1common/Makefile.am b/libasn1common/Makefile.am
index 78f05fd..2301712 100644
--- a/libasn1common/Makefile.am
+++ b/libasn1common/Makefile.am
@@ -5,7 +5,7 @@
 noinst_LTLIBRARIES = libasn1common.la
 
 libasn1common_la_SOURCES =              \
-    asn1_ref.c asn1_ref.h               \
+    asn1_common.h asn1_ref.c asn1_ref.h \
     asn1_buffer.c asn1_buffer.h         \
     asn1_namespace.c asn1_namespace.h   \
     genhash.c genhash.h
diff --git a/libasn1common/asn1_common.h b/libasn1common/asn1_common.h
new file mode 100644
index 0000000..abbfd8f
--- /dev/null
+++ b/libasn1common/asn1_common.h
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2005 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $Id$
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h> /* for stat(2) */
+#endif
+
+#ifndef _WIN32
+#include <sysexits.h> /* for EX_USAGE & others */
+#else                 /* _WIN32 */
+#ifndef EX_USAGE
+#define EX_USAGE 64
+#endif
+#ifndef EX_DATAERR
+#define EX_DATAERR 65
+#endif
+#ifndef EX_SOFTWARE
+#define EX_SOFTWARE 70
+#endif
+#ifndef EX_OSERR
+#define EX_OSERR 71
+#endif
+#ifndef EX_OSFILE
+#define EX_OSFILE 72
+#endif
+#define snprintf _snprintf
+#endif /* _WIN32 */