Fix compilation problems on Macos X

Src/Kernels/Taylor/FTaylorKernel.hpp

@@ -186,7 +186,7 @@ private:
     FReal combin(const int& a, const int& b){
       // use assert to remove the following warning with gcc
       // error: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Werror=strict-overflow]
-      assert(("combin :: Error combin negative!!",a>=b));
+      assert(("combin :: Error combin negative!!" &&a>=b));
       //       if(a<b)  {printf("combin :: Error combin negative!! a=%d b=%d\n",a,b); exit(-1) ;  }
         return  factorials[a]/  (factorials[b]* factorials[a-b]) ;
     }

Utils/CMakeLists.txt

@@ -19,6 +19,7 @@ file(
 INCLUDE_DIRECTORIES(
      ${SCALFMM_BINARY_DIR}/Src 
      ${SCALFMM_SOURCE_DIR}/Src
+     ${SCALFMM_SOURCE_DIR}/Contribs
      ${SCALFMM_INCLUDES}
 )