[sane-devel] How to Install and Customize SANE Ubuntu 18.04

[Ralph Little]

Hi,

On 2022-05-24 22:14, Wes Rishel wrote:
> I have a new Ubuntu 18.04 system and I need to add a one-line patch to 
> fujitsu.h that Allan Noah has previously given us. And then I 
> presumably need to configure and make the package (?)
>
> Ubuntu seems to have 1.0..31 installed but I am thinking it might be 
> safer to get a fresh copy particular since I have gotten part way 
> through a couple of procedures without luck.
>
> There are instructions from several sources all of which sound 
> authoritative and give different sources, methods of downloading, etc. 
> I have tried following a couple of them and hit various issues which 
> might be obvious to a more experienced Linuxian.
>
> I think these are the questions I need answered and my tentative 
> answer. (Please advise me if I'm asking the wrong questions.)
>
> *Q1: What is the best way of downloading and building Sane 1.0.31 
> including the source files?*
> I want to be sure to get the stable version rather than a snapshot.
> (Currently, I am thinking that cloning 
> https://gitlab.com/sane-project/backends would be the appropriate 
> approach.)
>
> *Q2: Do I need to remove the existing SANE that came with Ubuntu 
> before i start this process?*
> *
> *
> *Q3: Where should I put it or where does the installer put it?*
> Depending on the download source I either pick a destination or it 
> automatically just puts it somewhere. In the first case is there a 
> preferred directory in the Ubuntu file structure? If the recommended 
> approach turns out to be apt, apt-get, or some other package 
> installer, how can I find that? (I am assuming something like "sudo 
> find / -iname libsane-dll* will find all versions but how do I know I 
> am looking at the version I just installed rather than the 
> preinstalled version?
>
> *Q4: What is the procedure after downloading the system?*
> I am assuming that 
> https://gitlab.com/sane-project/backends/-/blob/master/INSTALL.linux 
> is tje definitive source. Can it really be as easy as
>
>     $ ./autogen.sh          # only if you just cloned the git repository
>     $ ./configure
>     $ make
>     $ make install
>
>
> Or as a practical matter, do I really need to follow one of the more 
> complex procedures in that document?
>
> *Q5: Editing in my patch.*
> I assume that I can do the build, see that it works okay, and then 
> edit in my patch and rebuild. I assume that I skip the autogen.sh when 
> rebuilding?
>
> *Q5: Do I need to do this as root?*
>
> Thanks in advance for your attention and advice!
>
> -- Wes

My advice for you really depends on what you want to do with this header 
file change.

If you just need to try the change out to see if it works, then I would 
build SANE with the change, installing it to a temporary area where you 
can test the newly generated fujitsu backend.

1. Clone the repo from 
https://gitlab.com/sane-project/backends/-/tree/master
2. Make the change to the header file.
3. Get the build dependencies using "sudo apt build-dep sane-backends" 
(I think you have to have the source repos enabled).
4. Do the build steps that you mention above but when you do the 
./configure, specify a temporary location: "./configure --prefix 
$HOME/sane-install" or whereever you would like the install to go to. 
The backend files will go to $HOME/sane-install/lib/sane in this case.
5. In a terminal, set LD_LIBRARY_PATH to load libraries from the 
temporary area: "export LD_LIBRARY_PATH=$HOME/sane-install/lib/sane"
6. Run your favourite frontend from the terminal, e.g. xsane
7. Test the change.

If the change is good, then we can add it to the backend repo and you 
can use the SANE git PPA here: 
https://launchpad.net/~sane-project/+archive/ubuntu/sane-git
We are still generating builds for Bionic since it is a LTS release.

Cheers,
Ralph

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