diff --git a/premake5.lua b/premake5.lua
index b50d6ab..7569e27 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -93,6 +93,11 @@ workspace "librw"
 	filter "action:vs*"
 		buildoptions { "/wd4996", "/wd4244" }
 
+	filter { "platforms:win*gl3", "action:not vs*" }
+		if _OPTIONS["gfxlib"] == "sdl2" then
+			includedirs { "/mingw/include/SDL2" } -- TODO: Detect this properly
+		end
+
 	filter {}
 
 	Libdir = "lib/%{cfg.platform}/%{cfg.buildcfg}"
@@ -122,8 +127,11 @@ function findlibs()
 		else
 			links { "SDL2" }
 		end
-	filter { "platforms:win*gl3" }
+	filter { "platforms:win*gl3", "action:vs*" }
 		defines { "GLEW_STATIC" }
+		links { "glew32s" }
+	filter { "platforms:win*gl3", "action:not vs*" }
+		links { "glew32" }
 	filter { "platforms:win-amd64-gl3" }
 		libdirs { path.join(_OPTIONS["glewdir"], "lib/Release/x64") }
 		libdirs { path.join(_OPTIONS["glfwdir"], "lib-vc2015") }
@@ -132,14 +140,16 @@ function findlibs()
 		libdirs { path.join(_OPTIONS["glewdir"], "lib/Release/Win32") }
 		libdirs { path.join(_OPTIONS["sdl2dir"], "lib/x86") }
 	filter { "platforms:win*gl3" }
-		links { "glew32s", "opengl32" }
+		links { "opengl32" }
 		if _OPTIONS["gfxlib"] == "glfw" then
 			links { "glfw3" }
 		else
 			links { "SDL2" }
 		end
 	filter { "platforms:*d3d9" }
-		links { "d3d9", "Xinput9_1_0" }
+		links { "gdi32", "d3d9" }
+	filter { "platforms:*d3d9", "action:vs*" }
+		links { "Xinput9_1_0" }
 	filter {}
 end
 
diff --git a/rw.h b/rw.h
index a000c55..bdfc62a 100644
--- a/rw.h
+++ b/rw.h
@@ -1,4 +1,5 @@
 #include <cstdio>
+#include <cstdlib>
 #include <cmath>
 
 #include "src/rwbase.h"
diff --git a/skeleton/win.cpp b/skeleton/win.cpp
index ee5d67a..ba8f30e 100644
--- a/skeleton/win.cpp
+++ b/skeleton/win.cpp
@@ -8,6 +8,10 @@ using namespace rw;
 
 #ifdef RW_D3D9
 
+#ifndef VK_OEM_NEC_EQUAL
+#define VK_OEM_NEC_EQUAL 0x92
+#endif
+
 static int keymap[256];
 static void
 initkeymap(void)
@@ -65,6 +69,7 @@ WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
 	static int resizing = 0;
 	static int buttons = 0;
+	POINTS p;
 
 	MouseState ms;
 	switch(msg){
@@ -108,7 +113,7 @@ WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 		break;
 
 	case WM_MOUSEMOVE:
-		POINTS p = MAKEPOINTS(lParam);
+		p = MAKEPOINTS(lParam);
 		ms.posx = p.x;
 		ms.posy = p.y;
 		EventHandler(MOUSEMOVE, &ms);
@@ -231,8 +236,14 @@ WinMain(HINSTANCE instance, HINSTANCE,
 	if(!QueryPerformanceCounter((LARGE_INTEGER*)&ticks))
 		return 0;
 
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
+	args.argc = _argc;
+	args.argv = _argv;
+#else
 	args.argc = __argc;
 	args.argv = __argv;
+#endif
+
 	if(EventHandler(INITIALIZE, nil) == EVENTERROR)
 		return 0;
 
@@ -294,7 +305,11 @@ WinMain(HINSTANCE instance, HINSTANCE,
 	freopen("CONOUT$", "w", stderr);
 */
 
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
+	return main(_argc, _argv);
+#else
 	return main(__argc, __argv);
+#endif
 }
 #endif
 #endif
diff --git a/src/gl/gl3immed.cpp b/src/gl/gl3immed.cpp
index bc31582..93ba26c 100644
--- a/src/gl/gl3immed.cpp
+++ b/src/gl/gl3immed.cpp
@@ -17,7 +17,7 @@
 namespace rw {
 namespace gl3 {
 
-static uint32 im2DVbo, im2DIbo;
+uint32 im2DVbo, im2DIbo;
 static int32 u_xform;
 
 #define STARTINDICES 10000
diff --git a/tools/clumpview/tl_tests.cpp b/tools/clumpview/tl_tests.cpp
index cbcf83b..dfee700 100644
--- a/tools/clumpview/tl_tests.cpp
+++ b/tools/clumpview/tl_tests.cpp
@@ -6,6 +6,8 @@ extern bool dosoftras;
 using namespace rw;
 using namespace RWDEVICE;
 
+void rastest_renderTriangles(RWDEVICE::Im2DVertex *scrverts, int32 verts, uint16 *indices, int32 numTris);
+
 //
 // This is a test to implement T&L in software and render with Im2D
 //
@@ -494,7 +496,6 @@ clipTriangles(MeshState *mstate, CamSpace3DVertex *camverts, Im2DVertex *scrvert
 static void
 submitTriangles(RWDEVICE::Im2DVertex *scrverts, int32 numVerts, uint16 *indices, int32 numTris)
 {
-void rastest_renderTriangles(RWDEVICE::Im2DVertex *scrverts, int32 verts, uint16 *indices, int32 numTris);
 	rw::SetRenderStatePtr(rw::TEXTURERASTER, nil);
 	if(dosoftras)
 		rastest_renderTriangles(scrverts, numVerts, indices, numTris);