mingw as always 
citrusperl\mingw\mingw32\pthreads-win32\i686-w64-mingw32\lib\libpthrea
+d.a
citrusperl\mingw\mingw32\pthreads-win32\i686-w64-mingw32\include\pthre
+ad.h

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In reply to Re^2: XS: free() outside of the main thread causes crash on Windows (mingw) by Anonymous Monk
in thread XS: free() outside of the main thread causes crash on Windows by OlegG

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