Unbreak cmake build.

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f15fa43..a1fc006 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,6 +87,8 @@
 ADD_DEFINITIONS("-D_CRT_SECURE_NO_WARNINGS")
 ENDIF(MSVC)
 
+ADD_DEFINITIONS("-DHAVE_CONFIG_H")
+
 # Targets
 ADD_SUBDIRECTORY(lib)
 ADD_SUBDIRECTORY(man)