Error installation lazarus 2.0.12 on fedora 33 ( Solved ) lazarus / 1-Linux ---------------------------------------------------------------------- young_nandy · 2021-03-02 12:54 Hello, I tried to install lazarus 2.0.12 on fedora 33 (VirtualBox). but appears as below (lazarus-ide: 2112): Gtk-WARNING **: 19: 50: 39.637: Unable to locate theme engine in module_path: "adwaita", (lazarus-ide: 2112): Gtk-WARNING **: 19: 50: 39.820: Unable to locate theme engine in module_path: "adwaita", Gtk-Message: 19: 50: 40.021: Failed to load module "pk-gtk-module" [FORMS.PP] ExceptionOccurred    Sender = Exception    Exception = Could not load OpenGL from libGL.so.1    Stack trace:    $ 08D28585    $ 08D2A5A8 TApplication.HandleException: Exception Could not load OpenGL from libGL.so.1    Stack trace:    $ 08D28585    $ 08D2A5A8 Exception at 08D28585: Exception: Could not load OpenGL from libGL.so.1. does anyone know the solution ? Thank you, Yudianto ---------------------------------------------------------------------- howardpc · 2021-03-02 13:55 Just guessing: perhaps the error message indicates you have not (properly) installed the adwaita theme, or that it is misconfigured? ---------------------------------------------------------------------- DonAlfredo · 2021-03-02 14:08 Also just guessing: install mesa-libGL-devel ? ---------------------------------------------------------------------- Handoko · 2021-03-02 14:25 I'm using Ubuntu Mate and I know I have to instal libgl1-mesa-dev if I want to develop OpenGL programs. And for a very rare case, I need to do this: sudo ln -s /usr/lib/x86_64-linux-gnu/libGL.so.1 /usr/lib/libGL.so ---------------------------------------------------------------------- young_nandy · 2021-03-03 02:22 Quote from: DonAlfredo on March 02, 2021, 03:08:47 pmAlso just guessing: install mesa-libGL-devel ? I've tried to install, but it's still the same error. thank you for helping ---------------------------------------------------------------------- young_nandy · 2021-03-03 02:48 Quote from: Handoko on March 02, 2021, 03:25:04 pmI'm using Ubuntu Mate and I know I have to instal libgl1-mesa-dev if I want to develop OpenGL programs. And for a very rare case, I need to do this: sudo ln -s /usr/lib/x86_64-linux-gnu/libGL.so.1 /usr/lib/libGL.so I didn't try this command sudo ln -s /usr/lib/x86_64-linux-gnu/libGL.so.1 /usr/lib/libGL.so because the x86_64-linux-gnu folder and the libGL.so.1 file don't exist. but I have fixed it with install sudo dnf install mesa-libGLU.i686 sudo dnf install mesa-libGL-devel but this error still appears when lazarus loads Error: fpc.cfg is missing. can anyone help? ---------------------------------------------------------------------- young_nandy · 2021-03-03 04:18 thank you for helping me to solve this problem. I've been successful in overcoming all the errors. with the last solution reinstalling the four rpm files. thank you