diff --git a/src/general.pri b/src/general.pri
index b5499535f..c46845ddf 100644
--- a/src/general.pri
+++ b/src/general.pri
@@ -27,6 +27,11 @@ CONFIG(system_eigen3): EIGENDIR = /usr/include/eigen3
 !CONFIG(system_eigen3):EIGENDIR = $$VCGDIR/eigenlib
 !CONFIG(system_glew):  GLEWDIR = $$MESHLAB_EXTERNAL_DIRECTORY/glew-2.1.0
 
+## Warnings Settings ##
+#not showing warnings from external libraries
+QMAKE_CXXFLAGS+=-Wno-unused-result #warning on unused result from fscanf...
+QMAKE_CFLAGS+=-Wno-unused-result
+
 
 ######## WINDOWS SETTINGS ##########
 
diff --git a/src/meshlabplugins/decorate_background/decorate_background.cpp b/src/meshlabplugins/decorate_background/decorate_background.cpp
index f9ae23de2..de5178281 100644
--- a/src/meshlabplugins/decorate_background/decorate_background.cpp
+++ b/src/meshlabplugins/decorate_background/decorate_background.cpp
@@ -358,6 +358,7 @@ void DecorateBackgroundPlugin::DrawGriddedCube(MLSceneGLSharedDataContext* share
     //    qDebug("BG Grid boxF %7.3f %7.3f %7.3f # %7.3f %7.3f %7.3f",minP[0],minP[1],minP[2],maxP[0],maxP[1],maxP[2]);
     //    qDebug("BG Grid boxG %7.3f %7.3f %7.3f # %7.3f %7.3f %7.3f",minG[0],minG[1],minG[2],maxG[0],maxG[1],maxG[2]);
     for (int ii=0;ii<3;++ii)
+    {
         for(int jj=0;jj<2;++jj)
         {
             bool front = FrontFacing(viewPos,ii,jj,minP,maxP);
@@ -374,12 +375,12 @@ void DecorateBackgroundPlugin::DrawGriddedCube(MLSceneGLSharedDataContext* share
                 }
             }
         }
-
-        glDisable(GL_BLEND);
-        glPopAttrib();
+    }
+    glDisable(GL_BLEND);
+    glPopAttrib();
 }
 
-void  DecorateBackgroundPlugin::setValue(QString name, Shotm val) 
+void  DecorateBackgroundPlugin::setValue(QString, Shotm val)
 {
     curShot=val;
 }
diff --git a/src/meshlabplugins/decorate_base/decorate_base.cpp b/src/meshlabplugins/decorate_base/decorate_base.cpp
index 9182ea5c6..d9f17f8af 100644
--- a/src/meshlabplugins/decorate_base/decorate_base.cpp
+++ b/src/meshlabplugins/decorate_base/decorate_base.cpp
@@ -375,9 +375,12 @@ void DecorateBasePlugin::drawQuotedLine(const Point3d &a,const Point3d &b, float
     // fmod ( -104.5 , 10) returns -4.5
     // So it holds that
 
-    if(aVal > 0 ) firstTick = aVal - fmod(aVal,tickScalarDistance) + tickScalarDistance;
-    if(aVal ==0 ) firstTick = tickScalarDistance;
-    if(aVal < 0 ) firstTick = aVal + fmod(fabs(aVal),tickScalarDistance);
+    if (aVal > 0 )
+        firstTick = aVal - fmod(aVal,tickScalarDistance) + tickScalarDistance;
+    else if(aVal ==0 )
+        firstTick = tickScalarDistance;
+    else //aVal < 0
+        firstTick = aVal + fmod(fabs(aVal),tickScalarDistance);
 
     // now we are sure that aVal < firstTick
     // let also be sure that there is enough space