Atlab: compilation error when ETSF_IO is enabled

When ETSF_IO Library is installed, its support is enabled, and compilation of Atlab fails with this error:

gfortran11 -I. -I. -I/usr/local/include -I/usr/local/include/futile    -fallow-argument-mismatch -I/usr/local/include -Wl,-rpath=/usr/local/lib/gcc11  -fPIC -c -o IOetsf.o  IOetsf.f90
IOetsf.f90:48:26:

   48 |     peri=bc_periodic_dims(geocode_to_bc(geocode))
      |                          1
Error: Function 'geocode_to_bc' at (1) has no IMPLICIT type
gmake[3]: *** [Makefile:606: IOetsf.o] Error 1

Whithout ETSF_IO, everything is fine.