Link SDL and Glut in CMake - c++

Question

I have a project (on linux) where I require glut and SDL.
I already managed to properly link glut, but I still cant get SDL linked.
My CMake file looks like this:
cmake_minimum_required(VERSION 3.7)
project(ObjLoader)
add_executable(testas main.cpp)
find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)
include_directories( ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS} )
target_link_libraries(testas ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
When building the following exception is error occurs:
/opt/JetBrains/apps/CLion/ch-0/181.4668.70/bin/cmake/bin/cmake --build /home/void/Documents/Projects/ObjLoader/cmake-build-debug --target testas -- -j 2
[ 50%] Linking CXX executable testas
CMakeFiles/testas.dir/main.cpp.o: In function `main':
/home/user/Documents/Projects/ObjLoader/main.cpp:165: undefined reference to `SDL_Init'
/home/user/Documents/Projects/ObjLoader/main.cpp:166: undefined reference to `SDL_SetVideoMode'
/home/user/Documents/Projects/ObjLoader/main.cpp:173: undefined reference to `SDL_GetTicks'
/home/user/Documents/Projects/ObjLoader/main.cpp:174: undefined reference to `SDL_PollEvent'
/home/user/Documents/Projects/ObjLoader/main.cpp:184: undefined reference to `SDL_GL_SwapBuffers'
/home/user/Documents/Projects/ObjLoader/main.cpp:188: undefined reference to `SDL_GetTicks'
/home/user/Documents/Projects/ObjLoader/main.cpp:189: undefined reference to `SDL_GetTicks'
/home/user/Documents/Projects/ObjLoader/main.cpp:189: undefined reference to `SDL_Delay'
/home/user/Documents/Projects/ObjLoader/main.cpp:191: undefined reference to `SDL_Quit'
collect2: error: ld returned 1 exit status
make[3]: *** [CMakeFiles/testas.dir/build.make:100: testas] Error 1
make[2]: *** [CMakeFiles/Makefile2:68: CMakeFiles/testas.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:80: CMakeFiles/testas.dir/rule] Error 2
make: *** [Makefile:118: testas] Error 2
but the same problem persists,
When I try to link it as described here: How to use SDL2 and SDL_image with cmake
the same problem persists. How can I properly include and link SDL in the CMake file above?
My attempt was this:
cmake_minimum_required(VERSION 3.7)
project(ObjLoader)
add_executable(testas main.cpp)
find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)
find_package(SDL2 REQUIRED)
include_directories( ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS} ${SDL2_INCLUDE_DIRS})
target_link_libraries(testas ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} ${SDL2_LIBRARIES})
Doesnt change anything, same problem.