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Please give exact code for:

./configure [--prefix=prefix]

I do not know how to put the prefix.

The Qjackctl sourceforge page states:

The installation procedure follows the standard for source distributions. In the extracted source directory, just do:

./configure [--prefix=prefix]

make

and optionally as root:

[sudo] make install

This procedure will end installing the following files:

prefix/bin/qjackctl

prefix/share/applications/qjackctl.desktop

prefix/share/icons/hicolor/32x32/apps/qjackctl.png

prefix/share/qjackctl/translations/qjackctl_*.qm

prefix/share/man/man1/qjackctl.1

Just launch prefix/bin/qjackctl and you're off (hopefully). Note that the default installation path prefix is /usr/local.

I tried it as below, but it fails...

kirby@kirby-Aspire-ES1-433:~/Desktop$ ls

qjackctl-0.5.0  qjackctl-0.5.0.tar.gz

kirby@kirby-Aspire-ES1-433:~/Desktop$ cd qjackctl-0.5.0

kirby@kirby-Aspire-ES1-433:~/Desktop/qjackctl-0.5.0$ ./configure --prefix=/bin/qjackctl

checking for gcc... gcc

checking whether the C compiler works... yes

checking for C compiler default output file name... a.out

checking for suffix of executables... 

checking whether we are cross compiling... no

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ISO C89... none needed

checking how to run the C preprocessor... gcc -E

checking for g++... g++

checking whether we are using the GNU C++ compiler... yes

checking whether g++ accepts -g... yes

checking how to run the C++ preprocessor... g++ -E

checking for pkg-config... /usr/bin/pkg-config

checking pkg-config is at least version 0.9.0... yes

checking for g++ major version... 7

checking for qmake-qt5... no

checking for qmake... /usr/bin/qmake

checking for Qt major version... qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory

0

configure: error: qmake-qt5 not found in current PATH. Maybe QT development environment isn't available. (qt5-devel)

kirby@kirby-Aspire-ES1-433:~/Desktop/qjackctl-0.5.0$ 

How to correct this ?

Installing qt5-default did the trick for me on Ubuntu 18.04:

sudo apt install qt5-default

One caveat, that was the last thing I tried and it worked. I'm unclear as to whether it alone would satisfy the requirements for installing qjackctl. Here are the other steps that I took prior to this working:

Reinstall qtchooser:

sudo apt-get install --reinstall qtchooser

That didn't seem to accomplish much. But then I installed qt4-qmake:

sudo apt-get install qt4-qmake

This eliminated the error that read checking for Qt major version... qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory but not the PATH error related to qmake-qt5

I then tried installing some build requirements:

sudo apt-get install qtbase5-dev qtbase5-dev-tools qttools5-dev-tools libqt5x11extras5-dev

...which installed 37.0MB of components, but didn't resolve the error.

I also tried to install build-essential:

sudo apt-get install build-essential

...but found that it was already installed and up to date.

Finally, having seen more than one mention of qt5-default (see the beginning of my answer), I tried installing it and the PATH error was resolved.