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HOW TO BUILD libportable source code?
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System requirements
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    - C compiler 
	
     mingw64, msys

     MinGW project on:
     http://sourceforge.net/projects/mingw-w64/

     msys project on
     https://sourceforge.net/projects/mingw/files/MSYS/

	 or

     Microsoft Visual Studio .

Build!
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mingw64 compiler 

build x86:

make clean
make

build x64:

make clean
make BITS=64

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vc compiler 

nmake -f Makefile.msvc clean
nmake -f Makefile.msvc

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vs2015

nmake -f Makefile.msvc clean
nmake -f Makefile.msvc MSVC_CRT=1900