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I'm trying to install Urho3D on RPi 3. (GPU = 768 MB)

I installed all the essential dependencies. All the steps went fine. Until this error which occurred during the final make step:

[ 56%] Building CXX object Source/Urho3D/CMakeFiles/Urho3D.dir/Graphics/Skybox.cpp.o
[ 57%] Building CXX object Source/Urho3D/CMakeFiles/Urho3D.dir/Graphics/Graphics.cpp.o
In file included from /root/Urho3D/Source/Urho3D/Graphics/../Graphics/GraphicsImpl.h:29:0,
                 from /root/Urho3D/Source/Urho3D/Graphics/Graphics.cpp:34:
/root/Urho3D/Source/Urho3D/Graphics/../Graphics/OpenGL/OGLGraphicsImpl.h:36:23: fatal error: GLES2/gl2.h: No such file or directory
 #include <GLES2/gl2.h>
                       ^
compilation terminated.
Source/Urho3D/CMakeFiles/Urho3D.dir/build.make:1916: recipe for target 'Source/Urho3D/CMakeFiles/Urho3D.dir/Graphics/Graphics.cpp.o' failed
make[2]: *** [Source/Urho3D/CMakeFiles/Urho3D.dir/Graphics/Graphics.cpp.o] Error 1
CMakeFiles/Makefile2:1198: recipe for target 'Source/Urho3D/CMakeFiles/Urho3D.dir/all' failed
make[1]: *** [Source/Urho3D/CMakeFiles/Urho3D.dir/all] Error 2
Makefile:137: recipe for target 'all' failed
make: *** [all] Error 2

Any suggestions? What should I do !?

2

The file GLES2/gl2.h belongs to the package called libgles2-mesa-dev, which you should install with apt-get.

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    I think it is just a missing include path. on Raspbian GLES2 is located in /opt/vc. The Raspberry Pi Foundation has it's own implementation that is specific to the Pi while MESA might not take full advantage of the hardware. – kwasmich Oct 10 '16 at 10:13
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    @kwasmich Hey, thanks - I didn't know about this folder's purpose. Which utterly defeats the purpose of POSIX directory naming, btw. Optional video drivers? Really? – Dmitry Grigoryev Oct 10 '16 at 10:41
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    @DmitryGrigoryev I doubt those responsible actually care, I think the secret history of linux on the Pi is that it was a bit grudging but too practical to be avoided ;) Anyway there's a bin directory in there (with stuff like raspicam and vcgencmd) too, but Raspbian probably has that in $PATH and there should be an entry for the linker in /etc/ld.so.conf -- but I do not have a pi to check right now and the OP does not mention an OS. Anyway the upstream source is in the firmware repo: github.com/raspberrypi/firmware (the hardfp version, probably). – goldilocks Oct 10 '16 at 13:21
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    To split hairs a bit: I wouldn't really call openGL a "video driver" BTW, it's a userspace graphics library stacked on top of appropriate drivers, but the two have some significant coupling. – goldilocks Oct 10 '16 at 13:27
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    @Omid1989 So there is a linker entry for the /opt/vc/lib stuff but that file is not there. I would just work with the MESA lib for now. Traditionally on linux it's associated with software emulation of GL hardware, but I am not positive this is necessarily the case currently. That's something you might check with them and/or the Urho3D devs. – goldilocks Oct 10 '16 at 22:44
0

On dec. 29th 2018, with nov. 13th 2018 raspbian stretch full img, this worked:

sudo apt-get install libx11-dev libxrandr-dev libasound2-dev git cmake make libgl1-mesa-dev
mkdir Src
cd Src
git clone https://github.com/urho3d/Urho3D
cd Urho3D
./script/cmake_rpi.sh .
make

(the rpi specific script takes care of the very special local video driver by declaring the RPI symbol)

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