Unfortunately, it works only with Microsoft compilers, but not MinGW

I think the problem with MinGW is that _WIN32_WINNT does not get defined to 0x0500 early enough. A solution is to insert the following code into the script (just above the foo function):

#ifndef _MSC_VER
typedef struct _MEMORYSTATUSEX {
    DWORD dwLength;
    DWORD dwMemoryLoad;
    DWORDLONG ullTotalPhys;
    DWORDLONG ullAvailPhys;
    DWORDLONG ullTotalPageFile;
    DWORDLONG ullAvailPageFile;
    DWORDLONG ullTotalVirtual;
    DWORDLONG ullAvailVirtual;
    DWORDLONG ullAvailExtendedVirtual;
} MEMORYSTATUSEX,*LPMEMORYSTATUSEX;

WINBASEAPI BOOL WINAPI GlobalMemoryStatusEx(LPMEMORYSTATUSEX);

#endif
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Works for me, anyway :-)

Cheers,
Rob