Qt 5.12: Failed to find "GL/gl.h" in "/usr/include/libdrm"

You need mesa packages.

$ sudo apt install mesa-common-dev libglu1-mesa-dev
And Try.

In OpenSuse Leap mesa packages are named differently too.

Use:

sudo zypper install Mesa-libGL-devel

to solve it.
I tried it with OpenSuse Leap 15.2 and 15.3.

If anybody using Fedora/RHEL finds this question, mesa packages are named differently here.

$ sudo dnf install mesa-libGL mesa-libGL-devel

Source: https://access.redhat.com/solutions/56301

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