diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake
index eec03f1..962ce3d 100644
--- a/ConfigureChecks.cmake
+++ b/ConfigureChecks.cmake
@@ -10,5 +10,10 @@
 #################################################
 
 # required stuff
+tde_setup_architecture_flags( )
+
+include(TestBigEndian)
+test_big_endian(WORDS_BIGENDIAN)
+
 find_package( TQt )
 find_package( TDE )
diff --git a/config.h.cmake b/config.h.cmake
index a17378f..b709202 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -1 +1,5 @@
 #define TDENETWORKMANAGER_VERSION_STRING "@TDENETWORKMANAGER_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/tdenetworkmanager/src/sha1.cpp b/tdenetworkmanager/src/sha1.cpp
index 74f4df9..180f4bb 100644
--- a/tdenetworkmanager/src/sha1.cpp
+++ b/tdenetworkmanager/src/sha1.cpp
@@ -12,6 +12,8 @@
  * See README and COPYING for more details.
  */
 
+#include "config.h"
+
 #include <stdlib.h>
 #include <string.h>