Index: includes/environment.inc
--- includes/environment.inc.orig
+++ includes/environment.inc
@@ -531,7 +531,12 @@ function drush_is_mingw($os = NULL) {
  * Return tar executable name specific for the current OS
  */
 function drush_get_tar_executable() {
-  return drush_is_windows() ? (drush_is_mingw() ? "tar.exe" : "bsdtar.exe") : "tar";
+  if (drush_is_openbsd()) {
+    return 'gtar';
+  }
+  else {
+    return drush_is_windows() ? (drush_is_mingw() ? "tar.exe" : "bsdtar.exe") : "tar";
+  }
 }
 
 /**
@@ -540,6 +545,14 @@ function drush_get_tar_executable() {
  */
 function drush_is_osx($os = NULL) {
   return _drush_test_os($os, array("DARWIN"));
+}
+
+/**
+ * Check if the operating system is OS X.
+ * This will return TRUE for Mac OS X (Darwin).
+ */
+function drush_is_openbsd($os = NULL) {
+  return _drush_test_os($os, array("OPENBSD"));
 }
 
 /**