diff -Naur src/svgalib-1.9.25/threeDKit/quickmath.h src/svgalib-1.9.25.new/threeDKit/quickmath.h
--- src/svgalib-1.9.25/threeDKit/quickmath.h	2005-08-03 09:07:32.000000000 -0400
+++ src/svgalib-1.9.25/threeDKit/quickmath.h	2015-08-26 15:45:06.157175993 -0400
@@ -76,76 +76,17 @@
 
 #else
 
-extern inline double fsqr (double x)
-{
-    return x * x;
-}
-
-extern inline int lsqr (int x)
-{
-    return (int) x *x;
-}
-
-extern inline double fmax (double a, double b)
-{
-    return max (a, b);
-}
-
-extern inline double fmin (double a, double b)
-{
-    return min (a, b);
-}
-
-extern inline double fsgn (double a)
-{
-    return (a == 0.0 ? 0.0 : (a > 0.0 ? 1.0 : -1.0));
-}
-
-extern inline double dot (Vec a, Vec b)
-{
-    return a.x * b.x + a.y * b.y + a.z * b.z;
-}
-
-extern inline Vec cross (Vec a, Vec b)
-{
-    Vec c;
-    c.x = a.y * b.z - a.z * b.y;
-    c.y = a.z * b.x - a.x * b.z;
-    c.z = a.x * b.y - a.y * b.x;
-    return c;
-}
-
-extern inline Vec plus (Vec a, Vec b)
-{
-    Vec c;
-    c.x = a.x + b.x;
-    c.y = a.y + b.y;
-    c.z = a.z + b.z;
-    return c;
-}
-
-extern inline Vec minus (Vec a, Vec b)
-{
-    Vec c;
-    c.x = a.x - b.x;
-    c.y = a.y - b.y;
-    c.z = a.z - b.z;
-    return c;
-}
-
-extern inline Vec times (Vec a, double f)
-{
-    Vec c;
-    c.x = a.x * f;
-    c.y = a.y * f;
-    c.z = a.z * f;
-    return c;
-}
-
-extern inline double norm (Vec a)
-{
-    return sqrt (sqr (a.x) + sqr (a.y) + sqr (a.z));
-}
+extern inline double fsqr (double x);
+extern inline int lsqr (int x);
+extern inline double fmax (double a, double b);
+extern inline double fmin (double a, double b);
+extern inline double fsgn (double a);
+extern inline double dot (Vec a, Vec b);
+extern inline Vec cross (Vec a, Vec b);
+extern inline Vec plus (Vec a, Vec b);
+extern inline Vec minus (Vec a, Vec b);
+extern inline Vec times (Vec a, double f);
+extern inline double norm (Vec a);
 
 #endif