Bug: https://bugs.gentoo.org/895978
--- a/Source/GameDraw.cpp
+++ b/Source/GameDraw.cpp
@@ -765,7 +765,7 @@ int Game::DrawGLScene(void)
 
 				GLfloat LightAmbient[]=	{ fogcolorr/4, fogcolorg/4, fogcolorb/4, 1.0f};
 
-				GLfloat LightDiffuse[]=	{ fogcolorr*1.6, fogcolorg*1.6, fogcolorr*1.6, 1.0f };
+				GLfloat LightDiffuse[]=	{ static_cast<GLfloat>(fogcolorr*1.6), static_cast<GLfloat>(fogcolorg*1.6), static_cast<GLfloat>(fogcolorr*1.6), 1.0f };
 
 				glLightfv(GL_LIGHT0, GL_AMBIENT, LightAmbient);		
 
@@ -775,9 +775,9 @@ int Game::DrawGLScene(void)
 
 			if(environment!=sunny_environment){
 
-				GLfloat LightAmbient[]=	{ fogcolorr*.8, fogcolorg*.8, fogcolorb*.8, 1.0f};
+				GLfloat LightAmbient[]=	{ static_cast<GLfloat>(fogcolorr*.8), static_cast<GLfloat>(fogcolorg*.8), static_cast<GLfloat>(fogcolorb*.8), 1.0f};
 
-				GLfloat LightDiffuse[]=	{ fogcolorr*.8, fogcolorg*.8, fogcolorr*.8, 1.0f };
+				GLfloat LightDiffuse[]=	{ static_cast<GLfloat>(fogcolorr*.8), static_cast<GLfloat>(fogcolorg*.8), static_cast<GLfloat>(fogcolorr*.8), 1.0f };
 
 				glLightfv(GL_LIGHT0, GL_AMBIENT, LightAmbient);		
 
@@ -809,7 +809,7 @@ int Game::DrawGLScene(void)
 
 			GLfloat LightAmbient[]=		{ 0, 0, 0, 1.0f};
 
-			GLfloat LightDiffuse[]=		{ .1+sinefluct/5, 0, 0, 1.0f };
+			GLfloat LightDiffuse[]=		{ static_cast<GLfloat>(.1+sinefluct/5), 0, 0, 1.0f };
 
 			
 
--- a/Source/Maths.cpp
+++ b/Source/Maths.cpp
@@ -1,7 +1,7 @@
 /**> HEADER FILES <**/
 #include "Maths.h"
 
-double fast_sqrt (register double arg)
+double fast_sqrt (double arg)
 {	
 #ifdef OS9 
 	// Can replace with slower return std::sqrt(arg);
--- a/Source/Maths.h
+++ b/Source/Maths.h
@@ -5,7 +5,7 @@
 /**> HEADER FILES <**/
 #include <cmath>
 
-double fast_sqrt (register double arg);
+double fast_sqrt (double arg);
 
 #endif
 
--- a/Source/Quaternions.cpp
+++ b/Source/Quaternions.cpp
@@ -283,7 +283,7 @@ void Normalise(XYZ *vectory) {
 	vectory->z /= d;
 }
 
-float fast_sqrt (register float arg)
+float fast_sqrt (float arg)
 {	
 #ifdef OS9 
 	// Can replace with slower return std::sqrt(arg);
--- a/Source/Quaternions.h
+++ b/Source/Quaternions.h
@@ -69,7 +69,7 @@ XYZ Quat2Vector(quaternion Quat);
 void CrossProduct(XYZ P, XYZ Q, XYZ *V);
 void Normalise(XYZ *vectory);
 float normaldotproduct(XYZ point1, XYZ point2);
-float fast_sqrt (register float arg);
+float fast_sqrt (float arg);
 bool PointInTriangle(XYZ *p, XYZ normal, XYZ *p1, XYZ *p2, XYZ *p3);
 bool LineFacet(XYZ p1,XYZ p2,XYZ pa,XYZ pb,XYZ pc,XYZ *p);
 float LineFacetd(XYZ p1,XYZ p2,XYZ pa,XYZ pb,XYZ pc,XYZ *p);