--- source/apache_1.3.33.upstream/src/modules/experimental/mod_backtrace.c	2004-02-20 12:41:05.000000000 +0100
+++ build-tree/apache_1.3.34/src/modules/experimental/mod_backtrace.c	2005-01-26 14:27:40.000000000 +0100
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-#if !defined(__linux__) && !defined(__FreeBSD__)
+#if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__)
 #error This module is currently only implemented for Linux and FreeBSD.
 #endif
 
