From b6d20c8a351f896ba8e62a2a7a6b276d9b04d883 Mon Sep 17 00:00:00 2001
From: Dom Heinzeller <climbfuji@ymail.com>
Date: Tue, 19 Nov 2019 16:04:46 -0700
Subject: [PATCH] modifications for build with pre-installed netCDF libraries

---
 Modules/FindNetCDF.cmake | 50 ++++++++++++++++++++++------------------
 1 file changed, 27 insertions(+), 23 deletions(-)

diff --git a/Modules/FindNetCDF.cmake b/Modules/FindNetCDF.cmake
index 69176db..387fd49 100644
--- a/Modules/FindNetCDF.cmake
+++ b/Modules/FindNetCDF.cmake
@@ -25,34 +25,38 @@
 #  target_link_libraries (uses_f90_interface ${NETCDF_LIBRARIES})
 #  target_link_libraries (only_uses_c_interface ${NETCDF_LIBRARIES_C})
 
-
-if(DEFINED ENV{NETCDF})
-  set(NETCDF_DIR $ENV{NETCDF})
-endif()
-message("HEY netcdf_dir is ${NETCDF_DIR}")
 if (NETCDF_INCLUDES AND NETCDF_LIBRARIES)
   # Already in cache, be silent
   set (NETCDF_FIND_QUIETLY TRUE)
 endif (NETCDF_INCLUDES AND NETCDF_LIBRARIES)
 
-if(DEFINED ENV{NETCDF4}) 
-  set(NETCDF_DIR $ENV{NETCDF4})
-elseif(DEFINED ENV{NETCDF_DIR})
-  set(NETCDF_DIR $ENV{NETCDF_DIR})
-elseif(DEFINED ENV{NETCDF_HOME})
-  set(NETCDF_DIR $ENV{NETCDF_HOME})
-elseif( DEFINED ENV{NETCDF} )
-  set(NETCDF_DIR $ENV{NETCDF})
-elseif(DEFINED ENV{SSEC_NETCDF4_DIR})
-  set(NETCDF_DIR $ENV{SSEC_NETCDF4_DIR})
-elseif(DEFINED ENV{SSEC_NETCDF_DIR})
-  set(NETCDF_DIR $ENV{SSEC_NETCDF_DIR})
-endif()
-if(DEFINED ENV{NETCDF_FORTRAN}) 
-  set(NETCDF_FORTRAN $ENV{NETCDF_FORTRAN})
-elseif(DEFINED ENV{NETCDF_FORTRAN_DIR}) 
-  set(NETCDF_FORTRAN $ENV{NETCDF_FORTRAN_DIR})
-endif()
+if(NETCDF)
+  set(NETCDF_DIR ${NETCDF})
+else(NETCDF)
+  # This is tricky, WRF users often have "export NETCDF4=1" in their environment (from old days)
+  if(DEFINED ENV{NETCDF4})
+    set(NETCDF_DIR $ENV{NETCDF4})
+  elseif(DEFINED ENV{NETCDF_DIR})
+    set(NETCDF_DIR $ENV{NETCDF_DIR})
+  elseif(DEFINED ENV{NETCDF_HOME})
+    set(NETCDF_DIR $ENV{NETCDF_HOME})
+  elseif( DEFINED ENV{NETCDF} )
+    set(NETCDF_DIR $ENV{NETCDF})
+  elseif(DEFINED ENV{SSEC_NETCDF4_DIR})
+    set(NETCDF_DIR $ENV{SSEC_NETCDF4_DIR})
+  elseif(DEFINED ENV{SSEC_NETCDF_DIR})
+    set(NETCDF_DIR $ENV{SSEC_NETCDF_DIR})
+  endif()
+endif(NETCDF)
+
+if(NOT NETCDF_FORTRAN)
+  if(DEFINED ENV{NETCDF_FORTRAN}) 
+    set(NETCDF_FORTRAN $ENV{NETCDF_FORTRAN})
+  elseif(DEFINED ENV{NETCDF_FORTRAN_DIR}) 
+    set(NETCDF_FORTRAN $ENV{NETCDF_FORTRAN_DIR})
+  endif(DEFINED ENV{NETCDF_FORTRAN})
+endif(NOT NETCDF_FORTRAN)
+
 find_path (NETCDF_INCLUDES netcdf.h
   HINTS ${NETCDF_DIR}/include $ENV{SSEC_NETCDF_DIR}/include )