Error compiling example_ex_fcn

[jalvesz]

Hi, I'm trying to compile the library under WSL2 with gfortran 9.4.0 and using fpm (0.7.0) and I encountered an error with the example_ex_fcn file:

...
libh5fortran.a done.
char_repeat_read failed.
[ 88%] Compiling...
/usr/bin/ld: build/gfortran_XXXXXXX/h5fortran/example_ex_fcn.c.o: in function main': ex_fcn.cpp:(.text+0x0): multiple definition of main'; build/gfortran_XXXXXXX/h5fortran/example_char_repeat_read.f90.o:char_repeat_read.f90:(.text.startup+0x0): first defined here
/usr/bin/ld: cannot find -lhdf5_hl_fortran
/usr/bin/ld: cannot find -lhdf5_fortran
/usr/bin/ld: cannot find -lhdf5_hl
/usr/bin/ld: cannot find -lhdf5collect2: error: ld returned 1 exit status
Compilation failed for object " char_repeat_read "stopping due to failed compilation
STOP 1

The instructions to build HDF5 with CMake worked like a charm. I compiled it to a different folder holding different libraries, lets say: //mnt/d/tmp/third_party_hdf5/release/

And the cloned h5fortran project is at
//mnt/d/tmp/fortran-lang/h5fortran

in the fpm.toml file I added the following line:

[library]
include-dir = ["../../../tmp/third_party_hdf5/release/include","../../../tmp/third_party_hdf5/release/include/static","../../../tmp/third_party_hdf5/release/lib"]

[build]
auto-tests = false
external-modules = ["hdf5", "h5lt"]

link = ["hdf5_hl_fortran", "hdf5_fortran", "hdf5_hl", "hdf5"] #uncommented this one instead of the default since in the build dir I do have hl ...

I also tried completing the command line with
export HDF5LIB="//mnt/d/tmp/third_party_hdf5/release/lib/"
export HDF5INC="//mnt/d/tmp/third_party_hdf5/release/include/"
fpm build --profile release --flag "-I$HDF5INC -L$HDF5LIB"

To no avail
Any clues? Thanks in advance