Try and build under PlatformIO

src/MMDVM.cpp

@@ -18,8 +18,6 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#if defined(STM32F4XX) || defined(STM32F7XX)
-
 #include "Config.h"
 #include "Globals.h"
 
@@ -207,13 +205,3 @@ void loop()
   if (m_modemState == STATE_IDLE)
     cwIdTX.process();
 }
-
-int main()
-{
-  setup();
-
-  for (;;)
-    loop();
-}
-
-#endif