Error: /usr/bin/ld: cannot find -lGL

[tomkonikkara]

I installed latest Qt 5 for Linux and tried to test by simply dragging and dropping a pushbutton and build. But it throws an error. I didn't get any idea. Here's the compile output:

11:54:57: Running steps for project Test...
11:54:57: Starting: "/usr/bin/make" clean -w
make: Entering directory `/home/tom/Data/Qt5/Test-build-Desktop_Qt_5_0_0_GCC_32bit_SDK-Debug'
rm -f moc_widget.cpp
rm -f ui_widget.h
rm -f main.o widget.o moc_widget.o
rm -f *~ core *.core
make: Leaving directory `/home/tom/Data/Qt5/Test-build-Desktop_Qt_5_0_0_GCC_32bit_SDK-Debug'
11:54:57: The process "/usr/bin/make" exited normally.
11:54:57: Configuration unchanged, skipping qmake step.
11:54:57: Starting: "/usr/bin/make" -w
make: Entering directory `/home/tom/Data/Qt5/Test-build-Desktop_Qt_5_0_0_GCC_32bit_SDK-Debug'
/home/tom/Programs/Qt/5.0.0/gcc/bin/uic ../Test/widget.ui -o ui_widget.h
g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../../Programs/Qt/5.0.0/gcc/mkspecs/linux-g++ -I../Test -I../../../Programs/Qt/5.0.0/gcc/include -I../../../Programs/Qt/5.0.0/gcc/include/QtWidgets -I../../../Programs/Qt/5.0.0/gcc/include/QtGui -I../../../Programs/Qt/5.0.0/gcc/include/QtCore -I. -I. -I. -o main.o ../Test/main.cpp
g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../../Programs/Qt/5.0.0/gcc/mkspecs/linux-g++ -I../Test -I../../../Programs/Qt/5.0.0/gcc/include -I../../../Programs/Qt/5.0.0/gcc/include/QtWidgets -I../../../Programs/Qt/5.0.0/gcc/include/QtGui -I../../../Programs/Qt/5.0.0/gcc/include/QtCore -I. -I. -I. -o widget.o ../Test/widget.cpp
/home/tom/Programs/Qt/5.0.0/gcc/bin/moc -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../../Programs/Qt/5.0.0/gcc/mkspecs/linux-g++ -I../Test -I../../../Programs/Qt/5.0.0/gcc/include -I../../../Programs/Qt/5.0.0/gcc/include/QtWidgets -I../../../Programs/Qt/5.0.0/gcc/include/QtGui -I../../../Programs/Qt/5.0.0/gcc/include/QtCore -I. -I. -I. ../Test/widget.h -o moc_widget.cpp
g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../../Programs/Qt/5.0.0/gcc/mkspecs/linux-g++ -I../Test -I../../../Programs/Qt/5.0.0/gcc/include -I../../../Programs/Qt/5.0.0/gcc/include/QtWidgets -I../../../Programs/Qt/5.0.0/gcc/include/QtGui -I../../../Programs/Qt/5.0.0/gcc/include/QtCore -I. -I. -I. -o moc_widget.o moc_widget.cpp
g++ -Wl,-rpath,/home/tom/Programs/Qt/5.0.0/gcc -Wl,-rpath,/home/tom/Programs/Qt/5.0.0/gcc/lib -o Test main.o widget.o moc_widget.o -L/home/tom/Programs/Qt/5.0.0/gcc/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread
/usr/bin/ld: cannot find -lGL
make: Leaving directory `/home/tom/Data/Qt5/Test-build-Desktop_Qt_5_0_0_GCC_32bit_SDK-Debug'
collect2: ld returned 1 exit status
make: *** [Test] Error 1
11:55:00: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project Test (kit: Desktop Qt 5.0.0 GCC 32bit (SDK))
When executing step 'Make'

[amleto]

take the GL dependency out of your pro file

[tomkonikkara]

take the GL dependency out of your pro file

Could you please tell how do I do that? I'm a newbie.

[Jonny174]

Add in pro file LIBS += -lGL

[wysota]

Could you please tell how do I do that? I'm a newbie.

Somewhere in your project file there is something similar to:

QT += opengl

QT += opengl

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Remove it and rerun qmake.

[tomkonikkara]

I tried both, but still not works.

This is my pro file:

#-------------------------------------------------
#
# Project created by QtCreator 2012-12-25T10:45:20
#
#-------------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Test
TEMPLATE = app


SOURCES += main.cpp\
widget.cpp

HEADERS += widget.h

FORMS += widget.ui

[wysota]

It seems that by default QtWidgets requires OpenGL. In that case do you have OpenGL installed? Can you find a file called libGL.so in your system?

[Viper666]

Hi i have some problem my .pro

#-------------------------------------------------
#
# Project created by QtCreator 2012-12-27T13:59:39
#
#-------------------------------------------------
 
QT       += core gui
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = untitled1
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h
 
FORMS    += mainwindow.ui

#-------------------------------------------------
#
# Project created by QtCreator 2012-12-27T13:59:39
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = untitled1
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

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ANd i have in system
libGL.so.1 and libGL.so.1.2.0
System: Linux Ubuntu 12.10

[wysota]

And why are you trying to hijack this thread instead of starting your own?

[Viper666]

Because author has same problems and he hasn't written nothing about 2 days.

[wysota]

We don't know if he has the same problem. You didn't even state what your problem was.

[wysota]

ANd i have in system
libGL.so.1 and libGL.so.1.2.0
System: Linux Ubuntu 12.10

BTW. You need libGL.so, not libGL.so.1. One should be a symlink to the other though (try running ldconfig as root and see if the link gets created).

[ecanela]

same problem using a fresh qt5 linux install.

I resolve this problem delete the -lGL option in the makefile generated in qmake. whis is a workaround but dor the moment works for me.

just search the -lGL option in Makefile and delete the text.

[wysota]

same problem using a fresh qt5 linux install.

This is not about Qt5. It is your system that is missing a library it is supposed to have. Reinstalling Qt won't help here. You need to install libmesa or accelerated NVIDIA drivers (in case you're using a NVIDIA card).

[Hronom]

Hello, I'm finded this problem on lubuntu 13.04 with Qt 5.0.2 when trying to compile my project with widgets and QtWebKit.
Solve this problem by writing command in terminal:

sudo apt-get install libglu1-mesa-dev

sudo apt-get install libglu1-mesa-dev

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[saman_artorious]

sudo apt-get install libglu1-mesa-dev

sudo apt-get install libglu1-mesa-dev

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Yes, every Ubuntu user needs to install this package before runnin opengl. This would have been very clear from the beginning if you had bothered to google the error..

[wysota]

Yes, every Ubuntu user needs to install this package before runnin opengl.

No, development packages are not required for running OpenGL.

[kid9591]

Hello, I'm finded this problem on lubuntu 13.04 with Qt 5.0.2 when trying to compile my project with widgets and QtWebKit.
Solve this problem by writing command in terminal:

sudo apt-get install libglu1-mesa-dev

sudo apt-get install libglu1-mesa-dev

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Wonderful, thank you. it works for me.

[mai7]

/usr/bin/ld: cannot find -lGL

meaning the linker misses an OpenGL library.

This happens on fresh installs QT 5.5 on mint 17.2 cinnamon, for example.

I used synaptic-pack-installer to install

libglfw-dev
header files and static libraries portable framework for OpenGL application development

and

libglfw2
Shared libraries portable framework for OpenGL application development


and that causally fixed it. The wizard apps do build all of a sudden.