diff --git a/src/clib/CMakeLists.txt b/src/clib/CMakeLists.txt
index 35b4d8c5bb4..93c4b3ee4fe 100644
--- a/src/clib/CMakeLists.txt
+++ b/src/clib/CMakeLists.txt
@@ -94,14 +94,8 @@ endif ()
 if (NetCDF_C_FOUND)
   target_include_directories (pioc
     PUBLIC ${NetCDF_C_INCLUDE_DIRS})
-  # target_compile_definitions (pioc
-  #   PUBLIC _NETCDF)
   target_link_libraries (pioc
     PUBLIC ${NetCDF_C_LIBRARIES})
-  #if (${NetCDF_C_HAS_PARALLEL})
-  #   target_compile_definitions (pioc
-  #     PUBLIC _NETCDF4)
-  #endif ()
   if (${NetCDF_C_LOGGING_ENABLED})
     target_compile_definitions (pioc
       PUBLIC NETCDF_C_LOGGING_ENABLED)
@@ -109,17 +103,12 @@ if (NetCDF_C_FOUND)
     target_compile_definitions (pioc
       PUBLIC LOGGING)
   endif()
-# else ()
-#   target_compile_definitions (pioc
-#     PUBLIC _NONETCDF)
 endif ()
 
 #===== PnetCDF-C =====
 if (PnetCDF_C_FOUND)
   target_include_directories (pioc
     PUBLIC ${PnetCDF_C_INCLUDE_DIRS})
-  # target_compile_definitions (pioc
-  #   PUBLIC _PNETCDF)
   target_link_libraries (pioc
     PUBLIC ${PnetCDF_C_LIBRARIES})
 
@@ -131,9 +120,6 @@ if (PnetCDF_C_FOUND)
       PUBLIC USE_PNETCDF_VARN
       PUBLIC USE_PNETCDF_VARN_ON_READ)
   endif()
-# else ()
-#   target_compile_definitions (pioc
-#     PUBLIC _NOPNETCDF)
 endif ()
 
 #===== Add EXTRAs =====
diff --git a/src/flib/CMakeLists.txt b/src/flib/CMakeLists.txt
index 0c7333aea19..506981ddc98 100644
--- a/src/flib/CMakeLists.txt
+++ b/src/flib/CMakeLists.txt
@@ -216,25 +216,14 @@ endif ()
 if (NetCDF_Fortran_FOUND)
   target_include_directories (piof
     PUBLIC ${NetCDF_Fortran_INCLUDE_DIRS})
-  # target_compile_definitions (piof
-  #   PUBLIC _NETCDF)
   target_link_libraries (piof
     PUBLIC ${NetCDF_Fortran_LIBRARIES})
-  # if (EXISTS ${NetCDF_Fortran_INCLUDE_DIR}/netcdf_par.h)
-  #   target_compile_definitions (piof
-  #     PUBLIC _NETCDF4)
-  # endif ()
-# else ()
-#   target_compile_definitions (piof
-#     PUBLIC _NONETCDF)
 endif ()
 
 #===== PnetCDF =====
 if (PnetCDF_Fortran_FOUND)
   target_include_directories (piof
     PUBLIC ${PnetCDF_Fortran_INCLUDE_DIRS})
-  # target_compile_definitions (piof
-  #   PUBLIC _PNETCDF)
   target_link_libraries (piof
     PUBLIC ${PnetCDF_Fortran_LIBRARIES})
 
@@ -246,9 +235,6 @@ if (PnetCDF_Fortran_FOUND)
       PUBLIC USE_PNETCDF_VARN
       PUBLIC USE_PNETCDF_VARN_ON_READ)
   endif()
-# else ()
-#   target_compile_definitions (piof
-#     PUBLIC _NOPNETCDF)
 endif ()
 
 #===== Add EXTRAs =====