diff --git a/configure.ac b/configure.ac
index 9e7fa06..cf16859 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,15 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 dnl Check that compiler understands inline
 AC_C_INLINE
 
+#
+# Generate version defines for include file
+#
+AC_SUBST([LIBPSL_VERSION_MAJOR], [`echo -n $VERSION|cut -d'.' -f1`])
+AC_SUBST([LIBPSL_VERSION_MINOR], [`echo -n $VERSION|cut -d'.' -f2`])
+AC_SUBST([LIBPSL_VERSION_PATCH], [`echo -n $VERSION|cut -d'.' -f3`])
+AC_SUBST([LIBPSL_VERSION_NUMBER], [`printf '0x%02x%02x%02x' $LIBPSL_VERSION_MAJOR $LIBPSL_VERSION_MINOR $LIBPSL_VERSION_PATCH`])
+AC_CONFIG_FILES([include/libpsl.h])
+
 #
 # Gettext
 #
diff --git a/include/libpsl.h.in b/include/libpsl.h.in
new file mode 100644
index 0000000..87f4594
--- /dev/null
+++ b/include/libpsl.h.in
@@ -0,0 +1,130 @@
+/*
+ * Copyright(c) 2014 Tim Ruehsen
+ *
+ * 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.
+ *
+ * This file is part of libpsl.
+ *
+ * Header file for libpsl library routines
+ *
+ * Changelog
+ * 20.03.2014  Tim Ruehsen  created
+ *
+ */
+
+#ifndef _LIBPSL_LIBPSL_H
+#define _LIBPSL_LIBPSL_H
+
+#include <stdio.h>
+#include <time.h>
+
+#define PSL_VERSION "@LIBPSL_VERSION@"
+#define PSL_VERSION_MAJOR @LIBPSL_VERSION_MAJOR@
+#define PSL_VERSION_MINOR @LIBPSL_VERSION_MINOR@
+#define PSL_VERSION_PATCH @LIBPSL_VERSION_PATCH@
+#define PSL_VERSION_NUMBER @LIBPSL_VERSION_NUMBER@
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+/**
+ * psl_error_t:
+ * @PSL_SUCCESS: Successful return.
+ * @PSL_ERR_INVALID_ARG: Invalid argument.
+ * @PSL_ERR_CONVERTER: Failed to open libicu utf-16 converter
+ * @PSL_ERR_TO_UTF16: Failed to convert to utf-16.
+ * @PSL_ERR_TO_LOWER: Failed to convert utf-16 to lowercase.
+ * @PSL_ERR_TO_UTF8: Failed to convert utf-16 to utf-8.
+ *
+ * Return codes for PSL functions.
+ * Negative return codes mean failure.
+ * Positive values are reserved for non-error return codes.
+ */
+typedef enum {
+	PSL_SUCCESS = 0,
+	PSL_ERR_INVALID_ARG = -1,
+	PSL_ERR_CONVERTER = -2, /* failed to open libicu utf-16 converter */
+	PSL_ERR_TO_UTF16 = -3, /* failed to convert to utf-16 */
+	PSL_ERR_TO_LOWER = -4, /* failed to convert utf-16 to lowercase */
+	PSL_ERR_TO_UTF8 = -5 /* failed to convert utf-16 to utf-8 */
+} psl_error_t;
+
+typedef struct _psl_ctx_st psl_ctx_t;
+
+/* frees PSL context */
+void
+	psl_free(psl_ctx_t *psl);
+/* loads PSL data from file */
+psl_ctx_t *
+	psl_load_file(const char *fname);
+/* loads PSL data from FILE pointer */
+psl_ctx_t *
+	psl_load_fp(FILE *fp);
+/* retrieves builtin PSL data */
+const psl_ctx_t *
+	psl_builtin(void);
+/* checks whether domain is a public suffix or not */
+int
+	psl_is_public_suffix(const psl_ctx_t *psl, const char *domain);
+/* checks whether cookie_domain is acceptable for domain or not */
+int
+	psl_is_cookie_domain_acceptable(const psl_ctx_t *psl, const char *hostname, const char *cookie_domain);
+/* returns the longest not registrable domain within 'domain' or NULL if none found */
+const char *
+	psl_unregistrable_domain(const psl_ctx_t *psl, const char *domain);
+/* returns the shortest possible registrable domain part or NULL if domain is not registrable at all */
+const char *
+	psl_registrable_domain(const psl_ctx_t *psl, const char *domain);
+/* convert a string into lowercase UTF-8 */
+psl_error_t
+	psl_str_to_utf8lower(const char *str, const char *encoding, const char *locale, char **lower);
+/* does not include exceptions */
+int
+	psl_suffix_count(const psl_ctx_t *psl);
+/* just counts exceptions */
+int
+	psl_suffix_exception_count(const psl_ctx_t *psl);
+/* just counts wildcards */
+int
+	psl_suffix_wildcard_count(const psl_ctx_t *psl);
+/* returns compilation time */
+time_t
+	psl_builtin_compile_time(void);
+/* returns mtime of PSL source file */
+time_t
+	psl_builtin_file_time(void);
+/* returns SHA1 checksum (hex-encoded, lowercase) of PSL source file */
+const char *
+	psl_builtin_sha1sum(void);
+/* returns file name of PSL source file */
+const char *
+	psl_builtin_filename(void);
+/* returns library version */
+const char *
+	psl_get_version(void);
+/* returns wether the built-in data is outdated or not */
+int
+	psl_builtin_outdated(void);
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* _LIBPSL_LIBPSL_H */