--- ray/src/common/color.h	1992/05/28 09:25:26	2.3
+++ ray/src/common/color.h	1992/10/02 15:54:25	2.4
@@ -98,7 +98,9 @@ typedef float  COLOR[3];	/* red, green, blue */
 #define  fputcolcor(cc,fp)	fprintf(fp,"%s %f %f %f\n",COLCORSTR, \
 					(cc)[RED],(cc)[GRN],(cc)[BLU])
 
+#ifndef ldexp
 extern double  ldexp();
+#endif
 #ifndef atof			/* atof's a macro on some systems! */
 extern double  atof();
 #endif