diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4db9c7..e8d13ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,8 @@ include( CheckCXXCompilerFlag )
 
 project( ZDRay )
 
+SET( CMAKE_CXX_STANDARD 14 )
+
 IF( NOT CMAKE_BUILD_TYPE )
 	SET( CMAKE_BUILD_TYPE Debug CACHE STRING
 		"Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
@@ -84,7 +86,7 @@ if( MSVC )
 endif( MSVC )
 
 if( CMAKE_COMPILER_IS_GNUCXX )
-	set( ALL_C_FLAGS "${ALL_C_FLAGS} -ffast-math -pipe" )
+	set( ALL_C_FLAGS "${ALL_C_FLAGS} -ffast-math -pipe -pthread" )
 	if( GPROF )
 		set( ALL_C_FLAGS "${ALL_C_FLAGS} -pg -g" )
 	else( GPROF )
diff --git a/src/level/level_light.cpp b/src/level/level_light.cpp
index ff41373..120e266 100644
--- a/src/level/level_light.cpp
+++ b/src/level/level_light.cpp
@@ -34,6 +34,7 @@
 #include "level/level.h"
 #include "lightmap/lightsurface.h"
 #include <algorithm>
+#include <memory>
 
 #ifdef _MSC_VER
 #pragma warning(disable: 4267) // warning C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data
@@ -198,11 +199,11 @@ void FLevel::CreateLights()
 			}
 			else if (!stricmp(key.key, "lightinnerangle"))
 			{
-				innerAngleCos = std::cosf(atof(key.value) * 3.14159265359f / 180.0f);
+				innerAngleCos = std::cos(atof(key.value) * 3.14159265359f / 180.0f);
 			}
 			else if (!stricmp(key.key, "lightouterangle"))
 			{
-				outerAngleCos = std::cosf(atof(key.value) * 3.14159265359f / 180.0f);
+				outerAngleCos = std::cos(atof(key.value) * 3.14159265359f / 180.0f);
 			}
 		}
 
diff --git a/src/lightmap/lightmap.cpp b/src/lightmap/lightmap.cpp
index 41680c5..bf7407f 100644
--- a/src/lightmap/lightmap.cpp
+++ b/src/lightmap/lightmap.cpp
@@ -250,11 +250,11 @@ kexVec3 kexLightmapBuilder::LightTexelSample(const kexVec3 &origin, surface_t *s
 		if (tl->outerAngleCos > -1.0f)
 		{
 			float negPitch = -radians(tl->mapThing->pitch);
-			float xyLen = std::cosf(negPitch);
+			float xyLen = std::cos(negPitch);
 			kexVec3 spotDir;
-			spotDir.x = std::sinf(radians(tl->mapThing->angle)) * xyLen;
-			spotDir.y = std::cosf(radians(tl->mapThing->angle)) * xyLen;
-			spotDir.z = -std::sinf(negPitch);
+			spotDir.x = std::sin(radians(tl->mapThing->angle)) * xyLen;
+			spotDir.y = std::cos(radians(tl->mapThing->angle)) * xyLen;
+			spotDir.z = -std::sin(negPitch);
 			float cosDir = kexVec3::Dot(dir, spotDir);
 			spotAttenuation = smoothstep(tl->outerAngleCos, tl->innerAngleCos, cosDir);
 			if (spotAttenuation <= 0.0f)
diff --git a/src/math/mathlib.h b/src/math/mathlib.h
index c405462..ccbd980 100644
--- a/src/math/mathlib.h
+++ b/src/math/mathlib.h
@@ -29,6 +29,7 @@
 
 #include <math.h>
 #include <cstdint>
+#include <cstddef>
 
 #ifdef M_PI
 #undef M_PI