https://github.com/Microsoft/WSL/issues/936 I think this is related 

On Tuesday, April 17, 2018 at 1:53:05 PM UTC-4, Erik Bray wrote:
>
> It looks like WSL might be assuming that *all* files are executables. 
> Cygwin does the same thing if you don't have UNIX permissions 
> emulation through Windows ACLs enabled (though it is by default).  I'm 
> not sure what the current state of WSL is in terms of emulating 
> UNIX-style permissions, but I'd have assumed they were at least past 
> needing to assume all files are executable. 
>
> Can you set the file build/pkgs/mpc/spkg-install to not be executable? 
>  E.g. 
>
> chmod -x build/pkgs/mpc/spkg-install 
>
> Afterwards you *should* have something like 
>
> $ ls -l build/pkgs/mpc/spkg-install 
> -rw-rw-r-- 1 embray embray 583 Apr 11 14:02 build/pkgs/mpc/spkg-install 
>
> with no 'x' in the permissions string.  If chmod still doesn't work 
> then that's a problem with WSL (on which I'm not sure building Sage is 
> fully supported yet anyways, though it has worked off-and-on). 
>
> On Tue, Apr 17, 2018 at 5:40 PM, 3kk7 <[email protected] <javascript:>> 
> wrote: 
> > I downloaded Ubuntu binaries from the website, extracted tar, and ran 
> make 
> > in extracted directory. Attached is the error I'm getting from a package 
> > called mpc-1.0.3.p0. 
> > 
> > 
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