diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 13382cf35..359d0e330 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -450,6 +450,22 @@ else( SSE_MATTERS )
 	set( BACKPATCH 0 )
 endif( SSE_MATTERS )
 
+if( X64 )
+	set( HAVE_MMX 1 )
+else( X64 )
+	set( SAFE_CMAKE_C_FLAGS ${CMAKE_C_FLAGS} )
+
+	if( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
+		set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mmmx")
+	endif( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
+
+	CHECK_CXX_SOURCE_COMPILES("#include <mmintrin.h>
+		int main(void) { __m64 v = _m_from_int(0); }"
+		HAVE_MMX)
+
+	set( CMAKE_C_FLAGS ${SAFE_CMAKE_C_FLAGS} )
+endif( X64 )
+
 # Set up flags for GCC
 
 if( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
@@ -582,10 +598,6 @@ endif( NOT DYN_FLUIDSYNTH )
 
 # Start defining source files for ZDoom
 set( PLAT_WIN32_SOURCES
-	gl/hqnx_asm/hq2x_asm.cpp
-	gl/hqnx_asm/hq3x_asm.cpp
-	gl/hqnx_asm/hq4x_asm.cpp
-	gl/hqnx_asm/hqnx_asm_Image.cpp
 	win32/eaxedit.cpp
 	win32/fb_d3d9.cpp
 	win32/fb_d3d9_wipe.cpp
@@ -669,6 +681,25 @@ else( WIN32 )
 	set( OTHER_SYSTEM_SOURCES ${PLAT_WIN32_SOURCES} ${PLAT_OSX_SOURCES} ${PLAT_COCOA_SOURCES} )
 endif( WIN32 )
 
+if( HAVE_MMX )
+	add_definitions( -DHAVE_MMX=1 )
+
+	set( SYSTEM_SOURCES ${SYSTEM_SOURCES}
+		gl/hqnx_asm/hq2x_asm.cpp
+		gl/hqnx_asm/hq3x_asm.cpp
+		gl/hqnx_asm/hq4x_asm.cpp
+		gl/hqnx_asm/hqnx_asm_Image.cpp)
+
+	if( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
+		set_source_files_properties(
+			gl/hqnx_asm/hq2x_asm.cpp
+			gl/hqnx_asm/hq3x_asm.cpp
+			gl/hqnx_asm/hq4x_asm.cpp
+			gl/textures/gl_hqresize.cpp
+			PROPERTIES COMPILE_FLAGS "-mmmx" )
+	endif( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
+endif( HAVE_MMX )
+
 if( NOT ASM_SOURCES )
 	set( ASM_SOURCES "" )
 endif( NOT ASM_SOURCES )
diff --git a/src/gl/hqnx_asm/hqnx_asm.h b/src/gl/hqnx_asm/hqnx_asm.h
index 2580f80ef..9ced349fa 100644
--- a/src/gl/hqnx_asm/hqnx_asm.h
+++ b/src/gl/hqnx_asm/hqnx_asm.h
@@ -21,7 +21,9 @@
 #ifndef __HQNX_H__
 #define __HQNX_H__
 
+#ifdef _MSC_VER
 #pragma warning(disable:4799)
+#endif // _MSC_VER
 
 #include "hqnx_asm_Image.h"
 
diff --git a/src/gl/hqnx_asm/hqnx_asm_Image.h b/src/gl/hqnx_asm/hqnx_asm_Image.h
index 8f57d7865..e4157a7b5 100644
--- a/src/gl/hqnx_asm/hqnx_asm_Image.h
+++ b/src/gl/hqnx_asm/hqnx_asm_Image.h
@@ -24,7 +24,9 @@
 
 #include <stdio.h>
 #pragma once
+#ifdef _MSC_VER
 #pragma warning(disable: 4103)
+#endif // _MSC_VER
 #pragma pack(1)
 
 namespace HQnX_asm
diff --git a/src/gl/system/gl_menu.cpp b/src/gl/system/gl_menu.cpp
index a9167b7a6..d4688cfd1 100644
--- a/src/gl/system/gl_menu.cpp
+++ b/src/gl/system/gl_menu.cpp
@@ -57,4 +57,18 @@ CUSTOM_CVAR (Float, vid_contrast, 1.f, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 // when they are actually valid.
 void gl_SetupMenu()
 {
+#ifndef HAVE_MMX
+	FOptionValues **opt = OptionValues.CheckKey("HqResizeModes");
+	if (opt != NULL) 
+	{
+		for(int i = (*opt)->mValues.Size()-1; i>=0; i--)
+		{
+			// Delete HQnX resize modes for non MSVC targets
+			if ((*opt)->mValues[i].Value >= 7.0)
+			{
+				(*opt)->mValues.Delete(i);
+			}
+		}
+	}
+#endif
 }
diff --git a/src/gl/textures/gl_hqresize.cpp b/src/gl/textures/gl_hqresize.cpp
index a4f192ce8..261f66e6a 100644
--- a/src/gl/textures/gl_hqresize.cpp
+++ b/src/gl/textures/gl_hqresize.cpp
@@ -40,13 +40,17 @@
 #include "gl/textures/gl_texture.h"
 #include "c_cvars.h"
 #include "gl/hqnx/hqx.h"
-#ifdef _MSC_VER
+#ifdef HAVE_MMX
 #include "gl/hqnx_asm/hqnx_asm.h"
 #endif
 
 CUSTOM_CVAR(Int, gl_texture_hqresize, 0, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOINITCALL)
 {
+#ifdef HAVE_MMX
+	if (self < 0 || self > 9)
+#else
 	if (self < 0 || self > 6)
+#endif
 		self = 0;
 	GLRenderer->FlushTextures();
 }
@@ -182,8 +186,7 @@ static unsigned char *scaleNxHelper( void (*scaleNxFunction) ( uint32* , uint32*
 	return newBuffer;
 }
 
-// [BB] hqnx scaling is only supported with the MS compiler.
-#ifdef _MSC_VER
+#ifdef HAVE_MMX
 static unsigned char *hqNxAsmHelper( void (*hqNxFunction) ( int*, unsigned char*, int, int, int ),
 							  const int N,
 							  unsigned char *inputBuffer,
@@ -281,7 +284,7 @@ unsigned char *gl_CreateUpsampledTextureBuffer ( const FTexture *inputTexture, u
 		outWidth = inWidth;
 		outHeight = inHeight;
 		int type = gl_texture_hqresize;
-#ifdef _MSC_VER
+#ifdef HAVE_MMX
 		// ASM-hqNx does not preserve the alpha channel so fall back to C-version for such textures
 		if (!hasAlpha && type > 3 && type <= 6)
 		{
@@ -303,7 +306,7 @@ unsigned char *gl_CreateUpsampledTextureBuffer ( const FTexture *inputTexture, u
 			return hqNxHelper( &hq3x_32, 3, inputBuffer, inWidth, inHeight, outWidth, outHeight );
 		case 6:
 			return hqNxHelper( &hq4x_32, 4, inputBuffer, inWidth, inHeight, outWidth, outHeight );
-#ifdef _MSC_VER
+#ifdef HAVE_MMX
 		case 7:
 			return hqNxAsmHelper( &HQnX_asm::hq2x_32, 2, inputBuffer, inWidth, inHeight, outWidth, outHeight );
 		case 8:
diff --git a/src/textures/texturemanager.cpp b/src/textures/texturemanager.cpp
index 3de5016fd..0612fa792 100644
--- a/src/textures/texturemanager.cpp
+++ b/src/textures/texturemanager.cpp
@@ -1239,7 +1239,7 @@ void FTextureManager::PrecacheLevel (void)
 	if (demoplayback)
 		return;
 
-	precacheTime = I_MSTime();
+	precacheTime = I_FPSTime();
 
 	hitlist = new BYTE[cnt];
 	memset (hitlist, 0, cnt);
diff --git a/wadsrc/static/menudef.z b/wadsrc/static/menudef.z
index 75ea1bf5f..ffe67ee51 100644
--- a/wadsrc/static/menudef.z
+++ b/wadsrc/static/menudef.z
@@ -103,6 +103,9 @@ OptionValue "HqResizeModes"
    4, "hq2x"
    5, "hq3x"
    6, "hq4x"
+   7, "hq2x MMX"
+   8, "hq3x MMX"
+   9, "hq4x MMX"
 }
 
 OptionValue "FogMode"