testing of IRONS filter coeffs

CMake/SuperBuild.cmake

 else()
     message( STATUS "Eigen WAS NOT FOUND ${eigen_DIR}" )
         ExternalProject_Add(EIGEN
-	    GIT_REPOSITORY "https://github.com/eigenteam/eigen-git-mirror.git"
-	    UPDATE_COMMAND "" 
+	    GIT_REPOSITORY "https://gitlab.com/libeigen/eigen.git"
+        UPDATE_COMMAND "" 
 	    GIT_TAG "3.3.7" #"default"
    	    PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/eigen
    	    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}

Modules/FDEM1D/include/FHT.h

     const Eigen::Matrix<Real, Eigen::Dynamic, 3>  FHT<FHTKONG241>::WT;
     template<>
     const Eigen::Matrix<Real, Eigen::Dynamic, 3>  FHT<IRONS>::WT;
+    // Clang wants generic declaration
+    template < HANKELTRANSFORMTYPE Type >
+    const Eigen::Matrix<Real, Eigen::Dynamic, 3>  FHT< Type >::WT;
 #endif
 
     template < HANKELTRANSFORMTYPE Type >

Modules/FDEM1D/python/CMakeLists.txt

 add_library(pyFDEM1D MODULE pyFDEM1D.cpp)
 target_link_libraries(pyFDEM1D PRIVATE pybind11::module lemmacore fdem1d )
 set_target_properties(pyFDEM1D PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
-                                       SUFFIX "${PYTHON_MODULE_EXTENSION}"
-                                                      OUTPUT_NAME "FDEM1D"
+	SUFFIX "${PYTHON_MODULE_EXTENSION}"
+    OUTPUT_NAME "FDEM1D"
+	CXX_STANDARD 14 
+	CXX_STANDARD_REQUIRED ON
 )
 
 install(TARGETS pyFDEM1D