--- CMakeLists.txt.orig	2020-10-23 19:39:38 UTC
+++ CMakeLists.txt
@@ -104,7 +104,7 @@ include_directories(
     src/input
     src/gui
     src/libs/fec
-    ${FFTW3F_INCLUDE_DIRS}
+    ${FFTW3F_INCLUDE_DIR}
     ${KISS_INCLUDE_DIRS}
     ${FAAD_INCLUDE_DIRS}
     ${LIBRTLSDR_INCLUDE_DIRS}
