Compilation issue on Linux

Hi all, trying to compile on Ubuntu with cmake 3.16.3, I'm getting the following errors

BasicDTUController/src/dtu_we_controller/dtu_we_controller.f90:903:22:

  903 |    external_dll%p_dll=loaddll(external_dll%filename,0)
      |                      1
Error: Cannot convert TYPE(c_ptr) to INTEGER(8) at (1)
BasicDTUController/src/dtu_we_controller/dtu_we_controller.f90:913:25:

  913 |    external_dll%p_func = loadsymbol(external_dll%p_dll,trim(adjustl(external_dll%func_name)),0)
      |                         1
Error: There is no specific function for the generic ‘loadsymbol’ at (1)
make[2]: *** [src/dtu_we_controller/CMakeFiles/dtu_we_controller.dir/build.make:63: src/dtu_we_controller/CMakeFiles/dtu_we_controller.dir/dtu_we_controller.f90.o] Error 1

Any hints ? Thanks