g++: error: /lib64/libGL.so: No such file or directory

[vasu_gupta]

I am using ubuntu 16.04 , qt 5.1.12.

i have already tried

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

which gave me

build-essential is already the newest version (12.1ubuntu2).
libgl1-mesa-dev is already the newest version (18.0.5-0ubuntu0~16.04.1).


opitical@optical:~$ locate libGL.

/home/opitical/Qt/5.12.1/Src/qtwebengine/src/3rdparty/chromium/third_party/mesa/src/docs/libGL.txt
/home/opitical/Qt/5.12.1/Src/qtwebengine/src/3rdparty/chromium/third_party/swiftshader/src/OpenGL/libGL/libGL.cpp
/home/opitical/Qt/5.12.1/Src/qtwebengine/src/3rdparty/chromium/third_party/swiftshader/src/OpenGL/libGL/libGL.def
/home/opitical/Qt/5.12.1/Src/qtwebengine/src/3rdparty/chromium/third_party/swiftshader/src/OpenGL/libGL/libGL.rc
/home/opitical/Qt/5.12.1/Src/qtwebengine/src/3rdparty/chromium/third_party/swiftshader/src/OpenGL/libGL/libGL.vcxproj
/home/opitical/Qt/5.12.1/Src/qtwebengine/src/3rdparty/chromium/third_party/swiftshader/src/OpenGL/libGL/libGL.vcxproj.filters
/usr/lib/x86_64-linux-gnu/libGL.so
/usr/lib/x86_64-linux-gnu/mesa/libGL.so
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1.2.0

[jsulm]

@vasu_gupta Can you show your pro file?

[vasu_gupta]

@jsulm

#-------------------------------------------------
#
# Project created by QtCreator 2017-08-16T18:19:20
#
#-------------------------------------------------

QT       += core gui
QT       += xml
QT       += core

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Qstackwidget_gui
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


QMAKE_LFLAGS += "-Wl,--enable-new-dtags,-rpath,/opt/pylon5/lib64"
INCLUDEPATH += /usr/local/include/opencv2
INCLUDEPATH += /usr/local/lib/
INCLUDEPATH += /usr/local/include/opencv
INCLUDEPATH += /opt/pylon5/include
INCLUDEPATH +=/home/optical/Downloads/pylon-5.0.12.11829-x86_64/Samples/C++/include
LIBS += -L/usr/local/lib -lopencv_core -lopencv_features2d -lopencv_imgcodecs -lopencv_highgui -lopencv_imgproc -lopencv_photo -lpthread \
         -L/opt/pylon5/lib64 -lpylonbase -lpylonutility -lGenApi_gcc_v3_0_Basler_pylon_v5_0 -lGCBase_gcc_v3_0_Basler_pylon_v5_0

SOURCES += \
        main.cpp \
        mainwindow.cpp \
    \ # stackedwidget.cpp #\
    stackedwidget_new.cpp \
    cal_widget.cpp \
    variables.cpp \
    ClickableLabel.cpp \
    ../RS232/rs232.c \
    ../RS232/rs232main.cpp \
    ../ExtTrig/ExtTrig.cpp \
    #../ExtTrig/frameobserver.cpp \
    ../IP/ossmprocessing.cpp \
    ../ossm_test/IP_test_timing_complete/structures.cpp \
    ../ossm_test/IP_test_timing_complete/Screw_focus.cpp \
    ../ossm_test/IP_test_timing_complete/Log.cpp \
    ../ossm_test/IP_test_timing_complete/Constants.cpp \
    ../ossm_test/IP_test_timing_complete/DimMesasure.cpp \
    report_viewer.cpp \
    ../ossm_test/IP_test_timing_complete/Segmentation.cpp \
    new_part_config.cpp \
    defect_label.cpp \
    defect_display_dialog.cpp \
    crack_calibration.cpp \
    groove_calibration.cpp

   # qled.cpp \
 #   qledplugin.cpp

HEADERS += \
        mainwindow.h \
    \ # stackedwidget.h #\
    stackedwidget_new.h \
    cal_widget.h \
    variables.h \
    ClickableLabel.h \
    ../RS232/rs232.h \
    ../RS232/rs232main.h \
    ../ExtTrig/ExtTrig.h \
    #../ExtTrig/frameobserver.h \
    ../IP/ossmprocessing.h \
    config.h \
    ../ossm_test/IP_test_timing_complete/Constants.h \
    ../ossm_test/IP_test_timing_complete/structures.h \
    ../ossm_test/IP_test_timing_complete/Screw_focus.h \
    ../ossm_test/IP_test_timing_complete/Log.h \
    ../ossm_test/IP_test_timing_complete/DimMesasure.h \
    report_viewer.h \
    ../ossm_test/IP_test_timing_complete/Segmentation.h \
    new_part_config.h \
    defect_label.h \
    defect_display_dialog.h \
    crack_calibration.h \
    groove_calibration.h
   # qled.h \
   # qledplugin.h

FORMS += \
        mainwindow.ui \
    stackedwidget_new.ui \
    report_viewer.ui \
    new_part_config.ui \
    defect_display_dialog.ui \
    crack_calibration.ui \
    groove_calibration.ui

SUBDIRS += \

RESOURCES += \# \
    #qled.qrc
    resource.qrc

#TARGET.path = $$/home/vasu/Qt/Tools/QtCreator/lib/Qt/plugins/designer
#INSTALLS+=TARGET

[edit: Added coding tags SGaist]

[Wotan]

Hello, I am wotan with a similar problem,
I remember once that I had the same problem as you, and it was because the link was not correctly defined for example on my computer if I do :
ls /usr/lib/x86_64-linux-gnu/libGL.so*
the answer is :

   0 lrwxrwxrwx 2 root root   14 nov.   3 23:25 /usr/lib/x86_64-linux-gnu/libGL.so -> libGL.so.1.7.0
   0 lrwxrwxrwx 2 root root   14 nov.   3 23:25 /usr/lib/x86_64-linux-gnu/libGL.so.1 -> libGL.so.1.7.0
672K -rwxr-xr-x 1 root root 670K nov.   3 23:25 /usr/lib/x86_64-linux-gnu/libGL.so.1.7.0

Check on your side if all the link point on your GL library (so for you it should be pointed on libGL.so.1.2.0)
Good luck ;-)

[vasu_gupta]

@Wotan for me it is giving

/usr/lib/x86_64-linux-gnu/libGL.so

[anil_arise]

@vasu_gupta check ldd /usr/lib/x86_64-linux-gnu/libGL.so
may be correctly not linked

[Wotan]

Well, for me, I have created a symbolic link to my library:
# ln -s /usr/lib/x86_64-linux-gnu/libGL.so /lib64/libGL.so
I am not sure that this is the smartest way to solve it, but it worked !
Tell me, if it works for you or if you have found something else ...