get Gryphn to compile on Linux

CMakeLists.txt

@@ -1,12 +1,17 @@
 cmake_minimum_required(VERSION 3.12)
-project(ChemistryRenderingApp LANGUAGES C CXX OBJCXX) # OBJCXX is required for Metal .mm files
-add_executable(ChemistryRenderingApp main.mm)
-target_link_libraries(ChemistryRenderingApp PRIVATE
-    "-framework Metal"
-    "-framework Foundation"
-    "-framework QuartzCore"
-    "-framework Cocoa"
-)
+project(ChemistryRenderingApp LANGUAGES C CXX)
+if (APPLE)
+    add_executable(ChemistryRenderingApp main.mm)
+    target_link_libraries(ChemistryRenderingApp PRIVATE
+        "-framework Metal"
+        "-framework Foundation"
+        "-framework QuartzCore"
+        "-framework Cocoa"
+    )
+endif()
+if (UNIX AND NOT APPLE)
+    add_executable(ChemistryRenderingApp main.cpp)
+endif()
 target_include_directories(ChemistryRenderingApp PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
 target_include_directories(ChemistryRenderingApp PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/glfw/include/")
 target_link_libraries(ChemistryRenderingApp PRIVATE GryphnLoader glfw)
@@ -17,5 +22,9 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 add_subdirectory(Gryphn)
 set(BUILD_SHARED_LIBS ON)
+
+set(GLFW_BUILD_WAYLAND OFF CACHE BOOL "" FORCE)
+set(GLFW_BUILD_X11 ON CACHE BOOL "" FORCE)
+
 add_subdirectory(glfw)
 set(BUILD_SHARED_LIBS OFF)