From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ben Woodcroft <b.woodcroft@uq.edu.au>
Subject: Re: downloading a tarball
Date: Fri, 24 Mar 2017 22:26:53 +1000
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To: Catonano <catonano@gmail.com>, help-guix <help-guix@gnu.org>

Hi,

On 24/03/17 22:06, Catonano wrote:
> This
> https://sourceforge.net/projects/libxls/files/
>
> I attempted to build the package several times but every time the hash 
> results to be wrong.
>
> I correct it and then it's wrong again
>
> For example, I get
>
> @ build-failed 
> /gnu/store/dcaqrf007jxyi0jzlsakr3j7faxm122f-libxsl-1.4.0.tar.gz.drv - 
> 1 output path 
> `/gnu/store/v6i85v3myb09nbsacq9ghx6yd0spcr67-libxsl-1.4.0.tar.gz' 
> should have sha256 hash 
> `1574bcyagix5fkbs0yi2npi59y1zck23y2aia52vdv6ra3i5raid', instead has 
> `1zmsb0w6qh4vx7n7r3yijc5p4fwljyk5apzi1hwmrr5rkawmqmks'

I think the mistake is that you are not taking the hash of the 
downloaded file, that is on the previous line. For instance from this 
example

output path 
`/gnu/store/7mfyynbzzi15265z92bdb00j7lxfa70y-libxls-1.4.0.zip' should 
have sha256 hash `0py8hsspvwjlckg2xi7jcpj0frrp2qbmsy9x55fx0knnwbhdg5d2', 
instead has `1g8ds7wbhsa4hdcn77xc2c0l3vvz5bx2hx9ng9c9n7aii92ymfnk'
@ build-failed 
/gnu/store/cv5nmjcwja91151zmxh9g956if0bl2xl-libxls-1.4.0.zip.drv - 1 
output path 
`/gnu/store/7mfyynbzzi15265z92bdb00j7lxfa70y-libxls-1.4.0.zip' should 
have sha256 hash `0py8hsspvwjlckg2xi7jcpj0frrp2qbmsy9x55fx0knnwbhdg5d2', 
instead has `1g8ds7wbhsa4hdcn77xc2c0l3vvz5bx2hx9ng9c9n7aii92ymfnk'

The correct hash is 0py8hsspvwjlckg2xi7jcpj0frrp2qbmsy9x55fx0knnwbhdg5d2.

HTH - speaking from experience making the same mistake here..
ben