e76b22 fix to include cmath

Authored and Committed by Keisuke Ogaki 9 years ago
    fix to include cmath
    
    this fixes commit#6dca1d3a6d64f6b55d5545fd209acc0f81aab9ec
    in OSX, need to include cmath to use std::abs
    
        
file modified
+1 -0