X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fcompiler.h;h=b168252de07b08d48c4de223642ecec1fc5aa545;hb=8a2bc1c21bec3c58fcd749f48a38a38c898e4a29;hp=3af548df6ecf67c9a7ee8e25113ecf9bb08f2ee7;hpb=e5f82f53b9dc07f9f557ff770a759bb975bb062c;p=simgear.git

diff --git a/simgear/compiler.h b/simgear/compiler.h
index 3af548df..b168252d 100644
--- a/simgear/compiler.h
+++ b/simgear/compiler.h
@@ -376,6 +376,8 @@
 #  define SG_GLU_H <OpenGL/glu.h>
 #  define SG_GLEXT_H <OpenGL/glext.h>
 #  define SG_GLUT_H <GLUT/glut.h>
+
+inline int (isnan)(double r) { return !(r <= 0 || r >= 0); }
 #else
 #  define SG_GL_H <GL/gl.h>
 #  define SG_GLX_H <GL/glx.h>
@@ -466,3 +468,4 @@ inline const_mem_fun_ref_t<_Ret,_Tp> mem_fun_ref(_Ret (_Tp::*__f)() const)
 #endif // SG_INCOMPLETE_FUNCTIONAL
 
 #endif // _SG_COMPILER_H
+