Re: Configure stable Ubuntu 18.04 fails to find Qt 5

[Daniel J Sebald]

On 05/09/2018 03:06 PM, JuanPi wrote:
> Hi,
>
> I am trying to build stable branch in Ubuntu 18.04
> The configure script ends with
>
> configure: WARNING: Your installation of Qt version 5 appears
> incomplete or broken in some way.  Fix that or use --with-qt=VER to
> use another version.
> configure: WARNING: Qt libraries not found; disabling Qt GUI
>
> $ grep Qt5 config.log
> Package Qt5Help was not found in the pkg-config search path.
> Perhaps you should add the directory containing `Qt5Help.pc'
> No package 'Qt5Help' found
> Package Qt5Help was not found in the pkg-config search path.
> Perhaps you should add the directory containing `Qt5Help.pc'
> No package 'Qt5Help' found
> No package 'Qt5Help' found
>    Build Octave Qt GUI:                  no (missing:Qt5Help)
>
> I have installed all these packages (and qt5-defaults)
> https://wiki.octave.org/Talk:Octave_for_Debian_systems#Qt5_in_Ubunutu_18.04_LTS
>
> Qt 5 Help is there:
> $ locate Qt5Help
> /usr/lib/x86_64-linux-gnu/libQt5Help.so.5
> /usr/lib/x86_64-linux-gnu/libQt5Help.so.5.9
> /usr/lib/x86_64-linux-gnu/libQt5Help.so.5.9.5
>
> What am I missing?

pkg-config is something used when building the resource in question. 
That is, if one is building all those Qt libraries and so on, it might 
create a pkg-config file.  Those files can then be referenced elsewhere 
for building other applications.  I tend to think of pkg-config as 
"development version", so look to see if development versions of Qt 
libraries are installed.

Dan