diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index 45509b2..853e0e2 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -9,6 +9,11 @@
 #
 #################################################
 
+# little/big endian?
+include(TestBigEndian)
+test_big_endian(WORDS_BIGENDIAN)
+
+
 # hal
 pkg_search_module( HAL hal )
 if( NOT HAL_FOUND )
diff --git a/config.h.cmake b/config.h.cmake
index 97e002c..c992f3f 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -1 +1,5 @@
 #define KNETWORKMANAGER_VERSION_STRING "@KNETWORKMANAGER_VERSION@"
+
+/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
+   significant byte first (like Motorola and SPARC, unlike Intel). */
+#cmakedefine WORDS_BIGENDIAN @WORDS_BIGENDIAN@
diff --git a/knetworkmanager-0.8/src/sha1.cpp b/knetworkmanager-0.8/src/sha1.cpp
index 74f4df9..180f4bb 100644
--- a/knetworkmanager-0.8/src/sha1.cpp
+++ b/knetworkmanager-0.8/src/sha1.cpp
@@ -12,6 +12,8 @@
  * See README and COPYING for more details.
  */
 
+#include "config.h"
+
 #include <stdlib.h>
 #include <string.h>