Description: Add '#include <ctime>' as 'clock' is defined there (#1016227).
Author: Andrius Merkys <merkys@debian.org>
--- a/include/openbabel/obutil.h
+++ b/include/openbabel/obutil.h
@@ -37,6 +37,7 @@
 #endif
 
 #include <math.h>
+#include <ctime>
 
 #ifndef M_PI
 #define M_PI 3.14159265358979323846