Fortran compiler lacks ISO_Fortran_binding.h

Solution to issue cannot be found in the documentation.

[X] I checked the documentation.

Issue

When installing a Fortran compiler (either via the fortran-compiler package as user or via {{ compiler('fortran') }} in a recipe), the C-include file include/ISO_Fortran_binding.h is not installed. Missing this file prevents the compilation of modern Fortran-C interfaces. It also prevents autotools from recognizing the Fortran compiler (gfortran) being F2008-compliant. For example, this seems to be the reason, why MPICH does not build the mpi_f08 module (conda-forge/mpich-feedstock#84) preventing the usage of the modern MPI-interface in Fortran programs.

If I build gcc myself, the include file gets installed. (I use the --enable-languages=c,c++,fortran option).

Installed packages

_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       2_gnu    conda-forge
binutils                  2.40                 hdd6e379_0    conda-forge
binutils_impl_linux-64    2.40                 hf600244_0    conda-forge
binutils_linux-64         2.40                 hbdbef99_2    conda-forge
c-compiler                1.6.0                hd590300_0    conda-forge
fortran-compiler          1.6.0                heb67821_0    conda-forge
gcc                       12.3.0               h8d2909c_2    conda-forge
gcc_impl_linux-64         12.3.0               he2b93b0_3    conda-forge
gcc_linux-64              12.3.0               h76fc315_2    conda-forge
gfortran                  12.3.0               h499e0f7_2    conda-forge
gfortran_impl_linux-64    12.3.0               hfcedea8_3    conda-forge
gfortran_linux-64         12.3.0               h7fe76b4_2    conda-forge
kernel-headers_linux-64   2.6.32              he073ed8_16    conda-forge
ld_impl_linux-64          2.40                 h41732ed_0    conda-forge
libgcc-devel_linux-64     12.3.0             h8bca6fd_103    conda-forge
libgcc-ng                 13.2.0               h807b86a_3    conda-forge
libgfortran5              13.2.0               ha4646dd_3    conda-forge
libgomp                   13.2.0               h807b86a_3    conda-forge
libsanitizer              12.3.0               h0f45ef3_3    conda-forge
libstdcxx-ng              13.2.0               h7e041cc_3    conda-forge
sysroot_linux-64          2.12                he073ed8_16    conda-forge

Environment info

active environment : fortran-compiler
    active env location : /home/aradi/opt/miniconda3/envs/fortran-compiler
            shell level : 2
       user config file : /home/aradi/.condarc
 populated config files : /home/aradi/.condarc
          conda version : 23.7.4
    conda-build version : not installed
         python version : 3.9.16.final.0
       virtual packages : __archspec=1=x86_64
                          __glibc=2.35=0
                          __linux=5.18.19=0
                          __unix=0=0
       base environment : /home/aradi/opt/miniconda3  (writable)
      conda av data dir : /home/aradi/opt/miniconda3/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/aradi/opt/miniconda3/pkgs
                          /home/aradi/.conda/pkgs
       envs directories : /home/aradi/opt/miniconda3/envs
                          /home/aradi/.conda/envs
               platform : linux-64
             user-agent : conda/23.7.4 requests/2.31.0 CPython/3.9.16 Linux/5.18.19-051819-generic ubuntu/22.04.3 glibc/2.35
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False

conda-forge / ctng-compilers-feedstock