diff --git a/MMVII/src/Matrix/cEigenDenseDecompos.cpp b/MMVII/src/Matrix/cEigenDenseDecompos.cpp
index 5dedbf849..03ee7073d 100755
--- a/MMVII/src/Matrix/cEigenDenseDecompos.cpp
+++ b/MMVII/src/Matrix/cEigenDenseDecompos.cpp
@@ -1,3 +1,8 @@
+// CM: g++ reports  "result: may be used uninitialized" with Eigen 3.4.0
+#if defined(__GNUC__) && !defined(__clang__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
 
 #include "MMVII_Tpl_Images.h"
 #include "MMVII_SysSurR.h"
@@ -7,6 +12,9 @@
 #include "Eigen/Householder"  // HouseholderQR.h"
 // #include "Eigen/Cholesky"  // HouseholderQR.h"
 
+#if defined(__GNUC__) && !defined(__clang__)
+#  pragma GCC diagnostic pop
+#endif
 using namespace Eigen;
 
 namespace MMVII
diff --git a/MMVII/src/Sensors/cMetaDataImages.cpp b/MMVII/src/Sensors/cMetaDataImages.cpp
index 5f6772113..af0f69941 100644
--- a/MMVII/src/Sensors/cMetaDataImages.cpp
+++ b/MMVII/src/Sensors/cMetaDataImages.cpp
@@ -528,7 +528,7 @@ class cAppli_EditCalcMetaDataImage : public cMMVII_Appli
 	
         cCollecSpecArg2007 & ArgObl(cCollecSpecArg2007 & anArgObl) override ;
         cCollecSpecArg2007 & ArgOpt(cCollecSpecArg2007 & anArgOpt) override;
-        virtual std::vector<std::string>  Samples() const; ///< For help, gives samples of "good" use
+        std::vector<std::string>  Samples() const override; ///< For help, gives samples of "good" use
 
 
         cPhotogrammetricProject     mPhProj;
diff --git a/MMVII/src/Sensors/cSensorCamPC.cpp b/MMVII/src/Sensors/cSensorCamPC.cpp
index 05c93e8c3..501a570ed 100644
--- a/MMVII/src/Sensors/cSensorCamPC.cpp
+++ b/MMVII/src/Sensors/cSensorCamPC.cpp
@@ -274,10 +274,10 @@ cSensorCamPC * cSensorCamPC::PCChangSys(cDataInvertibleMapping<tREAL8,3> & aMap)
         cPt3dr  aJJac ; GetCol(aJJac,aJac,1);
         cPt3dr  aKJac ; GetCol(aKJac,aJac,2);
         static int aCpt=0;
-        static tREAL8 aSNorm=0;
-        tREAL8 aNorm = std::abs(Norm2(aIJac)-Norm2(aJJac));
+        //CM: unused: static tREAL8 aSNorm=0;
+        //CM: unused: tREAL8 aNorm = std::abs(Norm2(aIJac)-Norm2(aJJac));
         aCpt++;
-        aSNorm += aNorm;
+        //CM: unused: aSNorm += aNorm;
 	// StdOut()  <<   "DNorm=" <<  aNorm << " Avg=" << aSNorm / aCpt << std::endl;
         aJac = M3x3FromCol(VUnit(aIJac),VUnit(aJJac),VUnit(aKJac));
     }
diff --git a/MMVII/src/SysCo/ChSysCoOri.cpp b/MMVII/src/SysCo/ChSysCoOri.cpp
index 397740d8c..73128744a 100644
--- a/MMVII/src/SysCo/ChSysCoOri.cpp
+++ b/MMVII/src/SysCo/ChSysCoOri.cpp
@@ -40,7 +40,7 @@ class cAppli_ChSysCoOri : public cMMVII_Appli
 
 	// Optionall Arg
 	cPt3dr           mOrigin;
-	tREAL8           mZ0;
+	//CM: unused:  tREAL8           mZ0;
         tREAL8           mEpsDer ;
 };
 
diff --git a/MMVII/src/TieP/cIndexe2Merged.cpp b/MMVII/src/TieP/cIndexe2Merged.cpp
index 86b7ed3cb..23f87474a 100644
--- a/MMVII/src/TieP/cIndexe2Merged.cpp
+++ b/MMVII/src/TieP/cIndexe2Merged.cpp
@@ -191,6 +191,8 @@ class cReadMTP_Std
               );
 
 	      cComputeMergeMulTieP *      CompMerge();
+	      bool WithSensor() const { return mWithSensor;}
+
       private :
               bool GetNextConfig();
 	      bool                        mWithIndex;