Hi Dmitry, On Sun, Feb 20, 2022 at 12:45:06AM +0300, Dmitry Tsarevich via Bzip2-devel wrote: > I'm trying to build bzip2 under Windows / MSVC > > Unfortunately, STDERR_FILENO is *nix specific and is not defined under MSVC. > > What I can suggest is to patch bzip2.c to define STDERR_FILENO under MSVC: > > diff --git a/bzip2.c b/bzip2.c > index d1f2fa8..d4550a9 100644 > --- a/bzip2.c > +++ b/bzip2.c > @@ -150,6 +150,8 @@ > ERROR_IF_MINUS_ONE ( retVal ); \ > } while ( 0 ) > > +#define STDERR_FILENO _fileno(stderr) > + > #endif /* BZ_LCCWIN32 */ I cannot test myself under Windows / MSVC, but that seems a reasonable suggestion. Especially since fileno is already used inside this BZ_LCCWIN32 block. I pushed the attached. Thanks, Mark