Boost can now be turned off, but gaussian quadrature won't work in that case.

CMakeLists.txt

 endif()
 
 ####################
+# Look for Boost
+####################
+option (LEMMA_USE_BOOST "Boost is required by gaussian quadrature classes" OFF)
+if (LEMMA_USE_BOOST)
+	find_package(Boost
+  		1.58.0                         # Minimum or EXACT version e.g. 1.36.0
+  		COMPONENTS math                # Boost libraries by their canonical name
+	)  
+	if(Boost_FOUND)
+  		include_directories(${Boost_INCLUDE_DIRS})
+	endif()
+	find_path( HAVE_BOOST_SPECIAL_FUNCTIONS "boost/math/special_functions.hpp" ) 
+	if(HAVE_BOOST_SPECIAL_FUNCTIONS)
+		add_compile_options(-DHAVE_BOOST_SPECIAL_FUNCTIONS)
+	endif()
+endif()
+
+####################
 # Magic rpath flag
 ####################
 SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

Modules/FDEM1D/include/GQChave.h

 
 #include "HankelTransform.h"
 #include "KernelEM1DBase.h"
-//#include <cmath>
-#include "boost/math/special_functions.hpp"
 
+#ifdef HAVE_BOOST_SPECIAL_FUNCTIONS
+#include "boost/math/special_functions.hpp"
+#endif
 
 namespace Lemma {
 

Modules/FDEM1D/include/QWEKey.h

 #include "HankelTransform.h"
 
 #include <Eigen/Eigenvalues>
+
+#ifdef HAVE_BOOST_SPECIAL_FUNCTIONS
 #include "boost/math/special_functions.hpp"
 #include "boost/math/special_functions/bessel.hpp"
+#endif
 
 namespace Lemma {
 

Modules/FDEM1D/src/CMakeLists.txt

 	${CMAKE_CURRENT_SOURCE_DIR}/FHTKey201.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/FHTKey101.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/FHTKey51.cpp
+
 	${CMAKE_CURRENT_SOURCE_DIR}/GQChave.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/QWEKey.cpp
 	

Modules/FDEM1D/src/GQChave.cpp

 
     /////////////////////////////////////////////////////////////
     //
+#ifdef HAVE_BOOST_SPECIAL_FUNCTIONS
     Real GQChave::Jbess(const Real &x, const int &IORDER) {
         switch (IORDER) {
             case 0:
                 throw std::runtime_error("Non 0 or 1 Bessel argument specified in GQChave");
         }
     }
-
+#else
+    Real GQChave::Jbess(const Real &x, const int &IORDER) {
+        std::cerr << "GQChave requires boost special functions module";
+    }
+#endif
     //////////////////////////////////////////////////////
     // Exception classes
 

Modules/FDEM1D/src/QWEKey.cpp

     //       Class:  QWEKey
     //      Method:  BesselWeights
     //--------------------------------------------------------------------------------------
+
+#ifdef HAVE_BOOST_SPECIAL_FUNCTIONS
     void QWEKey::BesselWeights ( const sZeroType& sType ) {
         GaussQuadWeights(nQuad); // TODO should this be moved out of initializer?
         std::vector<Real> bz;
         }
         return ;
     }		// -----  end of method QWEKey::BesselWeights  -----
-
+#else
+    void QWEKey::BesselWeights ( const sZeroType& sType ) {
+        std::cerr <<  "QWEKey requires boost special functions";
+    }
+#endif
 
     //--------------------------------------------------------------------------------------
     //       Class:  QWEKey