diff --git a/bin/lsd2_mac b/bin/lsd2_mac
index b89f38e..71edc8f 100755
Binary files a/bin/lsd2_mac and b/bin/lsd2_mac differ
diff --git a/src/lsd.cpp b/src/lsd.cpp
index 9ab487d..17bb418 100644
--- a/src/lsd.cpp
+++ b/src/lsd.cpp
@@ -143,7 +143,9 @@ int lsd::buildTimeTree( int argc, char** argv, InputOutputStream *inputOutput)
                 opt->givenRate[0] = false;
             }
         }
-        if (opt->estimate_root=="" || opt->estimate_root=="k") constraintConsistent = initConstraint(opt, nodes);
+        if (opt->estimate_root=="" || opt->estimate_root=="k"){
+            constraintConsistent = initConstraint(opt, nodes);
+        }
         if (opt->e>0) calculateOutliers(opt,nodes,median_rate,true);
         if (opt->splitExternal) splitExternalBranches(opt,nodes);
         if (!opt->constraint){//LD without constraints
@@ -159,7 +161,6 @@ int lsd::buildTimeTree( int argc, char** argv, InputOutputStream *inputOutput)
             }
             else if (opt->estimate_root=="k"){
                 cout<<"Estimating the root position on the branch defined by given outgroups ..."<<endl;
-                double br=0;
                 vector<int>::iterator iter=nodes[0]->suc.begin();
                 int s1=(*iter);
                 iter++;
@@ -218,9 +219,9 @@ int lsd::buildTimeTree( int argc, char** argv, InputOutputStream *inputOutput)
                         }
                     }
                     else if (opt->estimate_root=="k"){
+                        
                         if (constraintConsistent){
                             cout<<"Estimating the root position on the branch defined by given outgroups ..."<<endl;
-                            double br=0;
                             vector<int>::iterator iter=nodes[0]->suc.begin();
                             int s1=(*iter);
                             iter++;
diff --git a/src/options.cpp b/src/options.cpp
index 5849b72..af83d41 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -25,7 +25,7 @@ Pr* getOptions( int argc, char** argv )
 
 Pr* getCommandLine( int argc, char** argv)
 {
-    const string VERSION="v.1.9.6";
+    const string VERSION="v.1.9.7";
     Pr* opt = new Pr();
     int c;
     string s;
@@ -124,8 +124,8 @@ Pr* getCommandLine( int argc, char** argv)
                 if( !isReal(optarg) )
                     myExit("Argument of option -b must be a real.\n");
                 opt->c = atof( optarg );
-                if (opt->c<=0 || opt->c>1)
-                    myExit("Argument of option -b must be a positive number samller than 1, see the help\n page of lsd2 -h for more information.\n");
+                if (opt->c<=0)
+                    myExit("Argument of option -b must be a positive number, see the help\n page for more information.\n");
                 break;
             case 'e':
                 if( !isReal(optarg) )
@@ -356,7 +356,7 @@ Pr* getInterface()
 
 void printInterface(ostream& in, Pr* opt)
 {
-    const string VERSION = "v.1.9.6";
+    const string VERSION = "v.1.9.7";
 
     in<<"\nLEAST-SQUARE METHODS TO ESTIMATE RATES AND DATES - "<<VERSION<<" \n\n";
     in<<"\nInput files:\n";
@@ -513,7 +513,7 @@ void printHelp( void )
     const string BOLD = "\033[00;01m";
     const string LINE = "\033[00;04m";
     const string FLAT = "\033[00;00m";
-    const string VERSION = "v.1.9.6";
+    const string VERSION = "v.1.9.7";
     
     cout<<BOLD<<"LSD: LEAST-SQUARES METHODS TO ESTIMATE RATES AND DATES - "<<VERSION<<"\n\n";
     cout<<BOLD<<"DESCRIPTION\n"