$OpenBSD$
--- CMakeLists.txt.orig	Fri Jan 31 23:15:39 2014
+++ CMakeLists.txt	Fri Jan 31 23:15:56 2014
@@ -74,7 +74,7 @@ include(External_FFTW)
 
 include_directories(
   ${CMAKE_CURRENT_BINARY_DIR}
-  ${FFTW_INCLUDES}
+  ${FFTW_INCLUDE_DIR}
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${QT_INCLUDES}
   )