diff --git a/Makefile b/Makefile
index 8d42e2b..92ab003 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CXX=g++
 
-EIGEN_LOCATION=XXX
+EIGEN_LOCATION=/usr/include/eigen3
 BUILD_DIR=objs
 
 CXXFLAGS =-Wall
diff --git a/Utils.hpp b/Utils.hpp
index 605be20..5b1884a 100644
--- a/Utils.hpp
+++ b/Utils.hpp
@@ -4,6 +4,7 @@
 #include <string>
 #include <vector>
 #include <fstream>
+#include <cmath>
 
 namespace Utils{
   inline double max(const double& x, const double& y){
@@ -39,12 +40,12 @@ namespace Utils{
   }
 
   inline void infNan(const double& x){
-    assert(!isnan(x) && !isinf(x));
+    assert(!std::isnan(x) && !std::isinf(x));
   }
 
   inline void save(std::ofstream& ofs, const MatD& params){
     double val = 0.0;
-    
+
     for (int i = 0; i < params.cols(); ++i){
       for (int j = 0; j < params.rows(); ++j){
 	val = params.coeff(j, i);
@@ -55,7 +56,7 @@ namespace Utils{
 
   inline void load(std::ifstream& ifs, MatD& params){
     double val = 0.0;
-    
+
     for (int i = 0; i < params.cols(); ++i){
       for (int j = 0; j < params.rows(); ++j){
 	ifs.read((char*)&val, sizeof(double));