adds GLEW

Author: lindemeier

.github/workflows/cmake.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Install dependencies, opencv, Qt5 for GUIs and clang-10
       run: |
         sudo apt-get update
-        sudo apt-get install libopencv-dev qtbase5-dev clang-10 ninja-build libeigen3-dev libceres-dev libglfw3 libglfw3-dev
+        sudo apt-get install libopencv-dev qtbase5-dev clang-10 ninja-build libeigen3-dev libceres-dev libglfw3 libglfw3-dev libglew-dev
 
     - name: Create Build Environment
       # Some projects don't allow in-source building, so create a separate build directory