Did you make sure “copy project into workspace” was not checked when you imported the project into Eclipse?
I just tried building a clean copy of the project and was successful, albeit with the following warning:
..\..\..\Source\portable\MSVC-MingW\port.c: In function 'pxPortInitialiseStack':
..\..\..\Source\portable\MSVC-MingW\port.c:249:60: warning: cast between incompatible function types from 'TaskFunction_t' {aka 'void (*)(void *)'} to 'DWORD (__attribute__((stdcall)) *)(void *)' [-Wcast-function-type]
249 | pxThreadState->pvThread = CreateThread( NULL, xStackSize, ( LPTHREAD_START_ROUTINE ) pxCode, pvParameters, CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, NULL );
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