Add #include <math.h> statements.
--- a/src/LutefiskHaggis.c
+++ b/src/LutefiskHaggis.c
@@ -34,6 +34,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <math.h>
 
 /* Haggis headers */
 #include "LutefiskPrototypes.h"
@@ -2275,4 +2276,4 @@
 		}
 	}
 	return;
-}
\ No newline at end of file
+}
--- a/src/LutefiskMain.c
+++ b/src/LutefiskMain.c
@@ -52,6 +52,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <math.h>
 
 #if(defined(__MWERKS__) && __dest_os == __mac_os)
 /* Some Macintosh specific things */
