diff -u10 -r GMAT-R2020a/plugins/EstimationPlugin/src/base/measurement/Ionosphere/Ionosphere.hpp GMAT-R2020a-patched/plugins/EstimationPlugin/src/base/measurement/Ionosphere/Ionosphere.hpp
--- GMAT-R2020a/plugins/EstimationPlugin/src/base/measurement/Ionosphere/Ionosphere.hpp	2020-04-29 20:19:59.000000000 +0200
+++ GMAT-R2020a-patched/plugins/EstimationPlugin/src/base/measurement/Ionosphere/Ionosphere.hpp	2021-07-24 18:09:45.076976758 +0200
@@ -29,32 +29,20 @@
 #define Ionosphere_hpp
 
 #include "MediaCorrection.hpp"
 #include "gmatdefs.hpp"
 #include "Rvector3.hpp"
 
 #include "f2c.h"
 
 #ifdef __linux__
 
-#ifndef integer
-typedef int integer;
-#endif
-
-#ifndef logical
-typedef int logical;
-#endif
-
-#ifndef ftnlen
-typedef int ftnlen;
-#endif
-
 // SWIG has an internal max() function, so turn off the f2c macro
 #ifdef max
 #undef max
 #endif
 
 #endif
 
 #ifdef __APPLE__
 
 //#undef abs  // to work on Mac - the macro for abs confuses the Mac C++ code