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alloca() is declared in alloca.h which als happens to be included by stdlib.h. On mingw however it resides in malloc.h only. So if we include alloca.h directly, and add an alloca.h for mingw in it's port directory we can get rid of the mingw-specific define to include malloc.h and the other ports are happy as well.
This is experimental, community-supported Windows port of MicroPython. It is based on Unix port, and expected to remain so. To cross-compile under Debian/Ubuntu Linux system: sudo apt-get install mingw32 mingw32-binutils mingw32-runtime make CROSS_COMPILE=i586-mingw32msvc- The port requires additional testing, debugging, and patches. Please consider to contribute.