From accfa0d645c3bb0e846a854c38cec926d8c908e9 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Thu, 2 Mar 2023 15:15:22 +0100
Subject: cmake: fix sdl2 linux build

---
 external/CMakeLists.txt | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index 0012ec36..ad383f36 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -1,8 +1,15 @@
 project(floormat-external)
 
+if(NOT DEFINED FLOORMAT_SUBMODULE-SDL2)
+    find_package(SDL2 QUIET)
+    if(SDL2_FOUND)
+        set(FLOORMAT_SUBMODULE-SDL2 OFF CACHE BOOL "SDL2 as submodule")
+    endif()
+endif()
+
+set(FLOORMAT_SUBMODULE-SDL2 ON CACHE BOOL "SDL2 as submodule")
 set(FLOORMAT_SUBMODULE-DEPENDENCIES ON CACHE BOOL
     "Use dependencies included in the source directory (needs git submodule update --init).")
-set(FLOORMAT_SUBMODULE-SDL2 ON CACHE BOOL "SDL2 as submodule")
 
 foreach(_module corrade magnum magnum-integration magnum-plugins)
     list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/${_module}/modules")
@@ -141,6 +148,7 @@ if(FLOORMAT_SUBMODULE-DEPENDENCIES)
          MAGNUM_WITH_GLM                                    OFF
          MAGNUM_WITH_IMGUI                                  ON
     )
+    if(WIN32)
     sets(BOOL
          SDL2_DISABLE_INSTALL                               OFF
          SDL2_DISABLE_SDL2MAIN                              ON
@@ -186,6 +194,7 @@ if(FLOORMAT_SUBMODULE-DEPENDENCIES)
          SDL_WASAPI                                         OFF
          SDL_XINPUT                                         OFF
     )
+    endif(WIN32)
     if(WIN32)
         sets(BOOL MAGNUM_WITH_WINDOWLESSWGLAPPLICATION ON)
     elseif(APPLE)
-- 
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