Qt 5.7 -lGL not found

[BenoitH]

Hi !

I wanted to migrate my software from Qt 4.8 to 5.7, but I'm stopped by a message "-IGL not found" at the link stage.

I'm working on linux.

I don't understand which library is missing since under Qt 4.8 I don't have any error !

Thanks 4 your help,

BenoitH

[muratkarakus7]

It should be OpenGL library.

[SGaist]

Hi and welcome to devnet,

Please search the forum a bit, this question has been asked many times already: you are missing the OpenGL development package on your system.

Then name of the package depends on your distribution.

[chrysl666]

I have the same problem .
using Centos 7.2.1511 Core(x86-64) Cinnamon 2.8.8 (GCC) 4.8.5 20150623
after have installed all components my Qt creator is still sending error messages about libGL . which libGL should I use ?

/usr/bin/ld: skipping incompatible /usr/lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib/../lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/../lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/libGL.so when searching for -lGL

[SGaist]

Hi,

Did you install a 32 bit Qt in your system ?

[chrysl666]

@SGaist

my version is qt-opensource-linux-x64-5.7.0

[SGaist]

Can you show the linker line before it starts outputting this error ?

[chrysl666]

18:18:02: Running steps for project MyPrj...
18:18:02: Starting: "/home/chrystielira/Qt5.7.0x/5.7/gcc_64/bin/qmake" /home/chrystielira/Desktop/CPP_projects/MyPrj/MyPrj.pro -r -spec linux-g++ CONFIG+=debug CONFIG+=qml_debug
Info: creating stash file /home/chrystielira/Desktop/CPP_projects/build-MyPrj-Desktop_Qt_5_7_0_GCC_64bit-Debug/.qmake.stash
18:18:02: The process "/home/chrystielira/Qt5.7.0x/5.7/gcc_64/bin/qmake" exited normally.
18:18:02: Starting: "/usr/bin/make"
/home/chrystielira/Qt5.7.0x/5.7/gcc_64/bin/uic ../MyPrj/mainwindow.ui -o ui_mainwindow.h
g++ -c -pipe -g -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../MyPrj -I. -I../../../Qt5.7.0x/5.7/gcc_64/include -I../../../Qt5.7.0x/5.7/gcc_64/include/QtWidgets -I../../../Qt5.7.0x/5.7/gcc_64/include/QtGui -I../../../Qt5.7.0x/5.7/gcc_64/include/QtCore -I. -I. -I../../../Qt5.7.0x/5.7/gcc_64/mkspecs/linux-g++ -o main.o ../MyPrj/main.cpp
g++ -c -pipe -g -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../MyPrj -I. -I../../../Qt5.7.0x/5.7/gcc_64/include -I../../../Qt5.7.0x/5.7/gcc_64/include/QtWidgets -I../../../Qt5.7.0x/5.7/gcc_64/include/QtGui -I../../../Qt5.7.0x/5.7/gcc_64/include/QtCore -I. -I. -I../../../Qt5.7.0x/5.7/gcc_64/mkspecs/linux-g++ -o mainwindow.o ../MyPrj/mainwindow.cpp
/home/chrystielira/Qt5.7.0x/5.7/gcc_64/bin/moc -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I/home/chrystielira/Qt5.7.0x/5.7/gcc_64/mkspecs/linux-g++ -I/home/chrystielira/Desktop/CPP_projects/MyPrj -I/home/chrystielira/Qt5.7.0x/5.7/gcc_64/include -I/home/chrystielira/Qt5.7.0x/5.7/gcc_64/include/QtWidgets -I/home/chrystielira/Qt5.7.0x/5.7/gcc_64/include/QtGui -I/home/chrystielira/Qt5.7.0x/5.7/gcc_64/include/QtCore -I. -I/usr/include/c++/4.8.5 -I/usr/include/c++/4.8.5/x86_64-redhat-linux -I/usr/include/c++/4.8.5/backward -I/usr/lib/gcc/x86_64-redhat-linux/4.8.5/include -I/usr/local/include -I/usr/include ../MyPrj/mainwindow.h -o moc_mainwindow.cpp
g++ -c -pipe -g -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../MyPrj -I. -I../../../Qt5.7.0x/5.7/gcc_64/include -I../../../Qt5.7.0x/5.7/gcc_64/include/QtWidgets -I../../../Qt5.7.0x/5.7/gcc_64/include/QtGui -I../../../Qt5.7.0x/5.7/gcc_64/include/QtCore -I. -I. -I../../../Qt5.7.0x/5.7/gcc_64/mkspecs/linux-g++ -o moc_mainwindow.o moc_mainwindow.cpp
g++ -Wl,-rpath,/home/chrystielira/Qt5.7.0x/5.7/gcc_64/lib -o MyPrj main.o mainwindow.o moc_mainwindow.o -L/home/chrystielira/Qt5.7.0x/5.7/gcc_64/lib -lQt5Widgets -L/usr/lib64 -lQt5Gui -lQt5Core -lGL -lpthread
/usr/bin/ld: skipping incompatible /usr/lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib/../lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/../lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib64/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/libGL.so when searching for -lGL
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status
make: *** [MyPrj] Error 1
18:18:05: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project MyPrj (kit: Desktop Qt 5.7.0 GCC 64bit)
When executing step "Make"
18:18:05: Elapsed time: 00:03.

[SGaist]

Maybe a silly question but did you install the OpenGL dev package for your OS ?

[chrysl666]

@SGaist yes . unfortunately many times . but it doesn't works , and i don't have any clue of what is wrong in my system :( !!

[SGaist]

Strange, then one silly idea, install the Qt development environment from your distribution. That might trigger some additional packages installation that might help.

[ascnp]

It seems you did not install libgl or installed but the link was broken.
search libgl.so in your pi3 sysroot.