Add cmath for macosx.

src/driver_hydrus.cc

@@ -124,7 +124,7 @@ namespace
             );
 
         addNumericFieldWithExtractor(
-            "total_at_date",
+            "total_at_woot",
             "Fix this! The total water consumption recorded at last day. Perhaps?",
             DEFAULT_PRINT_PROPERTIES,
             Quantity::Volume,

src/dvparser.cc

@@ -20,6 +20,7 @@
 #include"util.h"
 
 #include<assert.h>
+#include<cmath>
 #include<math.h>
 #include<memory.h>
 #include<limits>