CLion, SDL2, CMake: No available video device - c++

Question

I am trying to start using SDL2 (with CLion as my IDE), but I'm running into errors. I'm on Pop!_OS 19.10 (based on ubuntu)
Here are the relevant project files:
CMakeLists.txt
cmake_minimum_required(VERSION 3.13)
project(sdlpractice)
set(CMAKE_CXX_STANDARD 20)
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})
add_executable(sdlpractice main.cpp)
target_link_libraries(sdlpractice ${SDL2_LIBRARIES})
Main.cpp
#include "SDL2/SDL.h"
#include "stdio.h"
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
int main(int argc, char* args[]) {
// The window we will be rendering to
SDL_Window * ptrWindow = NULL;
// The surface contained by the window
SDL_Surface * ptrScreenSurface = NULL;
// Initialize SDL
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
} else {
// Create window
ptrWindow = SDL_CreateWindow("SDL Practice",
SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
if (ptrWindow == nullptr) {
printf("Window creation failed: %s\n", SDL_GetError());
}
// Get window surface
ptrScreenSurface = SDL_GetWindowSurface(ptrWindow);
// Fill the surface white
SDL_FillRect(ptrScreenSurface, NULL, SDL_MapRGB(ptrScreenSurface->format, 0xFF, 0xFF, 0xFF));
// Update the surface
SDL_UpdateWindowSurface(ptrWindow);
// Wait 2 seconds
SDL_Delay(2000);
// Destroy window, quit SDL subsystems
SDL_DestroyWindow(ptrWindow);
SDL_Quit();
return 0;
}
}
I get the following error:
SDL could not initialize! SDL_Error: No available video device
I have tried setting DISPLAY=:0.0 in CLion's run configurations. Same error results. Futhermore, I ran
echo $DISPLAY
:1
and tried using :1 as well, same error persists.

Answer 1

Removing /usr/local/bin/sdl2-config,/usr/local/include/SDL2 and /usr/local/lib/libSDL2* (as suggested by Botje) solved the problem due to the self-built version of SDL2 missing the required video headers.