added options for cmor and fftw

CMakeLists.txt

@@ -67,10 +67,9 @@ endif()
 
 ### -------------- fftw3 ---------------------------
 message("Start check for fftw3")
-find_package(FFTW3 3.0 REQUIRED)
-if(NOT FFTW3_LIBRARIES)
-  message("FFTW3 not found, skipping FFTW3")
-else()
+option(CDO_FFTW "Enable fftw3, use -FFTW_ROOT for specific path" OFF)
+if(CDO_FFTW OR FFTW_ROOT)
+  find_package(FFTW3 3.0 REQUIRED)
   if(TARGET FFTW3::fftw3q)
     set(precision_fftw "q")
   elseif(TARGET FFTW3::fftw3l)
@@ -97,7 +96,8 @@ endif ()
 ### -------------- CMOR -----------------------------
 message("Start check for CMOR")
 
-if(CMOR_ROOT)
+option(CDO_CMOR "Enable fftw3, use -CDO_CMOR_ROOT for specific path" OFF)
+if(CDO_CMOR OR CDO_CMOR_ROOT)
   message("checking for CMOR requirements")
   find_package(Uuid REQUIRED)
   find_package(json-c REQUIRED)