cannot find -lGL Error

[jsulm]

@eswar

sudo apt-get install build-essential libgl1-mesa-dev

as described here https://doc.qt.io/qt-5/linux.html

[eswar]

@jsulm

ya tried, It also installed already. I tried most of the option. i didn't find the solution for the issue.

[jsulm]

@eswar You're building for your machine (no cross compilation)? Also try to delete build directory, run qmake and build again.

[aha_1980]

@eswar Which Linux do you have?

Type cat /etc/lsb-release in the console.

[JonB]

@eswar
After you have verified which distro you have as per @aha_1980's suggestion...

Assuming you do have a locate with an up-to-date database (sudo updatedb), copy & paste:

locate libGL.so

I'd expect it to come up with something, probably /usr/lib/x86_64-linux-gnu/libGL.so. Make sure it does, and whatever path is included on your link path.

[eswar]

@aha_1980
Hi
I am using linux mint.. Here the console output.

DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=19
DISTRIB_CODENAME=tara
DISTRIB_DESCRIPTION="Linux Mint 19 Tara"

[eswar]

@JonB
Hi
This is the console output for locate libGL.so

/usr/lib/libGL.so
/usr/lib/i386-linux-gnu/libGL.so.1
/usr/lib/i386-linux-gnu/libGL.so.1.0.0
/usr/lib/i386-linux-gnu/libGL.so.1.distrib
/usr/lib/x86_64-linux-gnu/libGL.so.1
/usr/lib/x86_64-linux-gnu/libGL.so.1.0.0
/usr/lib/x86_64-linux-gnu/libGL.so.1.distrib
/usr/lib/x86_64-linux-gnu/libGL.so.distrib

The library available in this path only . I did the following things.

1. Delete the build directory and build again
2. Unistall and install the Qt as well

[JonB]

@eswar
Then, assuming it will use /usr/lib/libGL.so via library path, do a ldd /usr/lib/libGL.so and make sure all the dependency libraries exist OK.

[jsulm]

@eswar Do you use 32bit Qt or 64bit?

[eswar]

@jsulm
Qt 5.11.2 and 64 bit

[jsulm]

@eswar Do you do anything special in your pro file?

[eswar]

@jsulm No changes in pro file

TEMPLATE = app

QT += qml quick
CONFIG += c++11
QT += charts

SOURCES += main.cpp
charts.cpp

RESOURCES += qml.qrc

Additional import path used to resolve QML modules in Qt Creator's code model

QML_IMPORT_PATH =

Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

HEADERS +=
charts.h

[Robert Hairgrove]

Was this ever resolved?

I was having the same problem just now on Ubuntu 18.04.4 after installing a recent version of the proprietary NVIDIA graphics driver. If I cd /usr/lib/x86_64-linux-gnu and look at all the libGL* files, i.e.:

bob@bobs-laptop:/usr/lib/x86_64-linux-gnu$ ls -l libGL.so*
lrwxrwxrwx 1 root root     14 Mai 10  2019 libGL.so -> libGL.so.1.0.0 <<< broken
lrwxrwxrwx 1 root root     14 Jul  5 14:57 libGL.so.1 -> libGL.so.1.7.0
-rwxr-xr-x 1 root root 685848 Jul  5 14:57 libGL.so.1.7.0

The first link is red on black background, which is a broken link (libGL.so.1.0.0 doesn't exist because NVIDIA replaced it with 1.7.0).

So I created symlinks in /usr/lib and /usr/lib/x86_64-linux-gnu, i.e.:

sudo ln -s /usr/lib/x86_64-linux-gnu/libGL.so.1.7.0 libGL.so

and then was able to build my project.

[jsulm]

@Robert-Hairgrove said in cannot find -lGL Error:

Was this ever resolved?

Looks like Ubuntu issue, not Qt