diff --git a/.gitignore b/.gitignore
index 2d5b5f42..f63e2394 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ obj
 *.o
 melon_grc.c
 melon_grc.h
+cmake-build
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4b1149f5..72ae4bf4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -22,8 +22,13 @@ add_library(core STATIC
 	SPU.cpp
 	Wifi.cpp
 	WifiAP.cpp
+	# opengl backend stuff
+	GPU3D_OpenGL.cpp
+	OpenGLSupport.cpp
 )
 
 if (WIN32)
 	target_link_libraries(core ole32 comctl32 ws2_32)
+else()
+	target_link_libraries(core OpenGL)
 endif()
diff --git a/src/OpenGLSupport.cpp b/src/OpenGLSupport.cpp
index 02048354..bb9e180e 100644
--- a/src/OpenGLSupport.cpp
+++ b/src/OpenGLSupport.cpp
@@ -18,6 +18,8 @@
 
 #include "OpenGLSupport.h"
 
+#include <cstring>
+
 
 DO_PROCLIST(DECLPROC);
 
diff --git a/src/libui_sdl/CMakeLists.txt b/src/libui_sdl/CMakeLists.txt
index 40019dba..0b7545be 100644
--- a/src/libui_sdl/CMakeLists.txt
+++ b/src/libui_sdl/CMakeLists.txt
@@ -10,6 +10,8 @@ SET(SOURCES_LIBUI
 	DlgEmuSettings.cpp
 	DlgInputConfig.cpp
 	DlgWifiSettings.cpp
+	# opengl backend stuff
+	DlgVideoSettings.cpp
 )
 
 option(BUILD_SHARED_LIBS "Whether to build libui as a shared library or a static library" ON)