error: 'qAbs' was not declared in this scope - linux

When I tried to install qwt manually, I got this error. How can I fix it? Thanks ahead. By the way, I also tried to install qwt by using command yum install, but after that I can't find where the qwt was installed.

rpm -ql qwt will tell you what files it installed. Please note that it's customary for RPM-based distributions to have -dev packages, so you're likely looking for the qwt-dev package.

The minimum information you have to give are Qt and Qwt version.

Related

python3-yaml needs dependency python3-yaml

I am trying to install lutris on SteamOS using Debian, to do so I require python3-yaml; which is becoming a nightmare to install. I found the debian file for python3-yaml online and have checked that I have installed all the dependencies required however I always end up with a strange error stating that the dependency "python3-yaml" is not satisfiable and I am unsure if this is a glitch in the software I am using or if python3-yaml actually needs python3-yaml to be installed.
I have attempted using normal yaml however that has not contributed anything towards my situation.
Could someone suggest a method for me to use to install python3-yaml and give me a few steps for doing it, thank you kindly.
To resolve this
dpkg -i python3-yaml.deb
apt-get install -f

libsdl2 package not installing on Ubuntu

Tried installing the package libsdl-image-2.0-0 from a .deb, which was a missing dependency for another package. It itself also had a bunch of dependencies I had to install, but anyway, NOW when I try to install it, I get this error: http://pastebin.com/YSnuxTNB
Running Ubuntu Precise, x86_64. No idea what the problem might be. Does anyone know how to resolve this?

Cannot install jpegoptim on Centos 6

I am trying to install jpegoptim on a CentOS 6 server. I have downloaded and unpacked the package but when I try to run ./configure from the jpegoptim-1.3.0 directory I get an error that says:
"cannot find libjpeg or you have too old version (v6 or later required)."
I have checked and I have libjpeg-turbo install, which should supercede libjpeg. I have not been able to find anything on the net about this issue. What am I doing wrong?
Thanks,
Rob
The configure script is looking for jpeglib.h which is in the libjpeg-turbo-devel package.
You may want to use yum to help you with what you are looking for. The following may get you what you need:
yum search libjpeg
yum install libjpeg*
Note I have the epel repository installed on my system too. So if the above don't give you what you want, you may need to install the epel repository first.

Installing Qt on linux, cannot find -lGL

I'm having a hard time trying to install Qt on linux. I downloaded the .run file on the website and installed Qt. However, when I try to compile the default Hello World project using Qtcreator, I get the following :
error cannot find -lGL
I was able to solve the problem by issuing the command :
sudo apt-get install libqt4-dev
But, I'm not satisfied with the solution as I want to use Qt5 and the name of the lib I downloaded implies version 4. Can someone explain what is going on and tell me if my solution is correct? If not, what should I do to get a working Qt on Linux.
Additional question
The correct answer, as provided by LtWorf, was to install libgl-dev. For future problems of this sort, can someone tell me how I should have guessed that I had to download this particular library? And why are there some libs with -dev at the end? What do they provide?
Well it is trying to link with libgl and doesn't find it. You should install libgl-dev.
-l is a linker option, it tells the linker to use a certain library.
For example you can have -lmagic meaning that you want to use libmagic.
Normally all libraries are called libsomething, and on debian you will find 3 packages called:
libsomething
libsomething-dbg
libsomething-dev
The 1st one is the library, the second one is the library compiled with the debug symbols, so you can make sense of stacktraces more easily, and the final one is the development package, it contains the .h files so you can link to the library.
sudo apt-get install libgl-dev
On Fedora 17, I did:
sudo yum install mesa-libGL-devel
Do you have libgl-dev installed? If not install it and it should work.
Those other posters are correct, but on some systems, the lib to install is named differently. I just dealt with a 32bit Ubuntu 14.04.5 LTS system, and libgl-dev was not available.
Instead, I needed to install the libgl1-mesa-dev package via:
sudo apt-get install libgl1-mesa-dev

/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h: No such file or directory

I am trying to install roccc 2.0. I have installed required packages. Now while installing it, it is giving me this error:
/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h: No such file or directory
I searched for gnu/stubs-32.h and came to know, for Linux 64-bit its in glibc-devel and for Linux 32-bit, its in libc6-dev-i386.
I am using Linux 32-bit: i386 GNU/Linux, but couldn't get the lib required to resolve this error.
Can somebody please help me out?
If your Linux distro is Redhat based (Fedora/CentOS/RHEL):
yum install glibc-devel.i686
References
Original post answer solved this problem RHEL x64
Header file gnu/stubs-32.h is under /usr/include/i386-linux-gnu/ but the install script tries to find it in /usr/include/, try this quick fix to complete the installation:
sudo ln -s /usr/include/i386-linux-gnu/gnu/stubs-32.h /usr/include/gnu/stubs-32.h
After installation is finished, you can delete the link.
The package name keeps on changing, just do a
yum list glibc-devel
to find out current package for 32 bit. In my case it only listed 2 packages one for 32 bit and one for 64 bit. I just installed the 32 bit using
yum install glibc-devel.i686
Install 'glibc-devel' package, or whatever it called in your distro. You may also need to install ia32-libs lib32z1-dev lib32bz2-dev (names could be different in your distro).
The script is trying to get stubs-32.h from /usr/include/ where it is not found. To solve this you have to add an "include" path (by default it is /usr/include) like this:
C_INCLUDE_PATH=/usr/include/i386-linux-gnu/
export C_INCLUDE_PATH
OR
export C_INCLUDE_PATH=/usr/include/$(gcc -print-multiarch)
You can visit Error "gnu/stubs-32.h: No such file or directory" while compiling Nachos source code for additional reference.
If on a Red Hat distro such as Fedora/CentOS/RHEL you can do the following to find out what package provides a given file:
$ repoquery -qf */stubs-32.h
glibc-devel-0:2.17-260.el7.i686
And then install it:
$ sudo yum install -y glibc-devel-0:2.17-260.el7.i686

Resources