diff --git a/neo/cmake-linux-release.sh b/neo/cmake-linux-release.sh
index bbc8757e..12ab504e 100755
--- a/neo/cmake-linux-release.sh
+++ b/neo/cmake-linux-release.sh
@@ -2,4 +2,4 @@ cd ..
 rm -rf build
 mkdir build
 cd build
-cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DONATIVE=ON -DFFMPEG=OFF -DBINKDEC=ON -DUSE_PRECOMPILED_HEADERS=OFF -DUSE_INTRINSICS_SSE=OFF ../neo
+cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DONATIVE=ON -DFFMPEG=OFF -DBINKDEC=ON -DUSE_PRECOMPILED_HEADERS=OFF -DUSE_INTRINSICS_SSE=ON ../neo
diff --git a/neo/libs/moc/CompilerSpecific.inl b/neo/libs/moc/CompilerSpecific.inl
index a6203ff9..8bf66301 100644
--- a/neo/libs/moc/CompilerSpecific.inl
+++ b/neo/libs/moc/CompilerSpecific.inl
@@ -77,6 +77,8 @@
 		free(ptr);
 	}
 
+	// RB: commented out
+#if 0
 	FORCE_INLINE void __cpuidex(int* cpuinfo, int function, int subfunction)
 	{
 		__cpuid_count(function, subfunction, cpuinfo[0], cpuinfo[1], cpuinfo[2], cpuinfo[3]);
@@ -92,6 +94,7 @@
 		);
 		return ((unsigned long long)edx << 32) | eax;
 	}
+#endif
 
 #else
 	#error Unsupported compiler
diff --git a/neo/libs/moc/MaskedOcclusionCulling.cpp b/neo/libs/moc/MaskedOcclusionCulling.cpp
index 043e6716..47255b67 100644
--- a/neo/libs/moc/MaskedOcclusionCulling.cpp
+++ b/neo/libs/moc/MaskedOcclusionCulling.cpp
@@ -24,7 +24,8 @@
 	#include "FrameRecorder.h"
 #endif
 
-#if defined(__AVX__) || defined(__AVX2__)
+// RB: only check this on Windows and expect any Linux user to have a CPU newer than 2013
+#if defined(_MSC_VER) && ( defined(__AVX__) || defined(__AVX2__) )
 	// For performance reasons, the MaskedOcclusionCullingAVX2/512.cpp files should be compiled with VEX encoding for SSE instructions (to avoid
 	// AVX-SSE transition penalties, see https://software.intel.com/en-us/articles/avoiding-avx-sse-transition-penalties). However, this file
 	// _must_ be compiled without VEX encoding to allow backwards compatibility. Best practice is to use lowest supported target platform
diff --git a/neo/renderer/tr_frontend_masked_occlusion_culling.cpp b/neo/renderer/tr_frontend_masked_occlusion_culling.cpp
index f4aead98..2751ee90 100644
--- a/neo/renderer/tr_frontend_masked_occlusion_culling.cpp
+++ b/neo/renderer/tr_frontend_masked_occlusion_culling.cpp
@@ -551,7 +551,7 @@ void R_FillMaskedOcclusionBufferWithModels( viewDef_t* viewDef )
 static void TonemapDepth( float* depth, unsigned char* image, int w, int h )
 {
 	// Find min/max w coordinate (discard cleared pixels)
-	float minW = FLT_MAX, maxW = 0.0f;
+	float minW = idMath::INFINITUM, maxW = 0.0f;
 	for( int i = 0; i < w * h; ++i )
 	{
 		if( depth[i] > 0.0f )
@@ -608,4 +608,4 @@ CONSOLE_COMMAND( maskShot, "Dumping masked occlusion culling buffer", NULL )
 	R_WritePNG( "screenshots/soft_occlusion_buffer.png", image, 3, width, height, "fs_basepath" );
 	delete[] image;
 }
-#endif
\ No newline at end of file
+#endif