[Slackbuilds-users] Problem/fix for SlackBuild for MP3Diags

[David Halliwell]

    Subscribing to the list, so I can see any other responses...

    Thanks for this advice. When trying the original compile, I was 
pretty sure that is was something like this - and I had tried going out 
of X to a level 3 prompt and logging in as root, to get a full root 
environment.

    I took a look this morning (which is after a reboot). I see the 
.qt4.sh and qt4.csh files in /etc/profile.d, but it seems that they are 
not having any effect on modifying my $PATH in either my real system or 
my VM. /usr/lib64/qt5/bin is there, and 'which qmake' gives me the qt5 
version (either as a regular user or as root). Must be something about 
how I have set up my machine - which is not a SlackBuild problem, AFAIK. 
I use bash, and the default /etc/profile does run .sh files in profile.d 
- but only if they are set executable (and qt4.sh is not). The qt4.sh 
script itself says to NOT make it executable.

    Again, thanks for the work everyone does in making the SlackBuilds 
resource available, and glad I could help in a small way..

Dave

On 2023-04-13 01:52, B. Watson wrote:
>
>
> Replying directly to the poster, plus to the list.
>
> On Wed, 12 Apr 2023, David Halliwell wrote:
>
>>    Today, I wanted to build/install the MP3Diags software 
>> (https://slackbuilds.org/repository/15.0/audio/MP3Diags/?search=mp3diag). 
>> It would not
>> build, exiting with a message about not finding Qwidget. I had seen 
>> the qt4 dependency, and had downloaded, built, and installed qt4 
>> using he
>> Slackbuild, but MP3Diags would not build on my Slackware 15.0 system 
>> (upgraded last year from 14.2). I also tried building it on a fairly 
>> clean
>> Slackware 15.0 VM, but had the same error.
>
> The probable reason for a SlackBuild not picking up your qt4 is
> that qt4 installs a script that sets some environment variables, in
> /etc/profile.d/. If you didn't have qt4 already installed, and you
> install it, then try to build something that expects those variables
> to already be set... you get the exact issue you were having.
>
> The easiest thing to do is install qt4, then log out & back in. Your
> new login will have the environment variables set correctly. The qt4
> README doesn't actually mention this (though it should).
>
> It's possible to write a SlackBuild that will source the profile
> script itself, avoiding this problem, but not all qt4-using scripts do
> this. You've found one that doesn't, apparently.
>
> So yeah, the MP3Diags SlackBuild needs attention. And so does the
> README for qt4. Thanks for pointing it out.

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