diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,8 @@
 INCLUDE(FindDoxygen)
 INCLUDE(FindGhostscript)
 
+ADD_DEFINITIONS(-DHAVE_CONFIG_H)
+
 INCLUDE(CheckTypeSize)
 CHECK_TYPE_SIZE("long long" LONG_LONG)