Index: pcsx2/CMakeLists.txt
--- pcsx2/CMakeLists.txt.orig
+++ pcsx2/CMakeLists.txt
@@ -612,6 +612,7 @@ if(USE_OPENGL)
 		if(X11_API)
 			list(APPEND pcsx2GSSources GS/Renderers/OpenGL/GLContextEGLX11.cpp)
 			list(APPEND pcsx2GSHeaders GS/Renderers/OpenGL/GLContextEGLX11.h)
+			target_include_directories(PCSX2_FLAGS INTERFACE ${X11_INCLUDE_DIR})
 		endif()
 
 		if(WAYLAND_API)
