diff --git a/ccstruct/imagedata.cpp b/ccstruct/imagedata.cpp
index 4016a92b5b..3c244c7724 100644
--- a/ccstruct/imagedata.cpp
+++ b/ccstruct/imagedata.cpp
@@ -17,6 +17,10 @@
 // limitations under the License.
 ///////////////////////////////////////////////////////////////////////
 
+// Include automatically generated configuration file if running autoconf.
+#ifdef HAVE_CONFIG_H
+#include "config_auto.h"
+#endif
 
 #include "imagedata.h"
 
diff --git a/ccstruct/split.cpp b/ccstruct/split.cpp
index 24650d4f7a..6e6ea446ee 100644
--- a/ccstruct/split.cpp
+++ b/ccstruct/split.cpp
@@ -25,6 +25,11 @@
 /*----------------------------------------------------------------------
               I n c l u d e s
 ----------------------------------------------------------------------*/
+// Include automatically generated configuration file if running autoconf.
+#ifdef HAVE_CONFIG_H
+#include "config_auto.h"
+#endif
+
 #include "split.h"
 #include "coutln.h"
 #include "tprintf.h"