Add a libplist_version() function to the interface

include/plist/plist.h

@@ -1215,6 +1215,13 @@ extern "C"
      */
     PLIST_API void plist_set_debug(int debug);
 
+    /**
+     * Returns a static string of the libplist version.
+     *
+     * @return The libplist version as static ascii string
+     */
+    PLIST_API const char* libplist_version();
+
     /*@}*/
 
 #ifdef __cplusplus

src/plist.c

@@ -1739,3 +1739,11 @@ void plist_print(plist_t plist)
 {
      plist_write_to_stream(plist, stdout, PLIST_FORMAT_PRINT, PLIST_OPT_PARTIAL_DATA);
 }
+
+const char* libplist_version()
+{
+#ifndef PACKAGE_VERSION
+#error PACKAGE_VERSION is not defined!
+#endif
+	return PACKAGE_VERSION;
+}