Bug 1738541

Description of problem:

The nf-config utility (provided by package netcdf-fortran-devel) is supposed to paths where netcdf.mod is found when specifying the --fflags. 

On Fedora 30, it returns /usr/include, however netcdf.mod is found in a different directory, /usr/lib64/gfortran/modules. Thus when compiling software that queries nf-config to find the module include path, it gets a path that doesn't have netcdf.mod, and compilation fails when it does not find netcdf.mod

This is exactly the same problem as in https://bugzilla.redhat.com/show_bug.cgi?id=1554621 which was closed as EOL for Fedora 26. The problem was also present in Fedora 29. I would have re-opened that bug, but I couldn't.

Version-Release number of selected component (if applicable):
$ rpm -qa | grep netcdf-fortran
netcdf-fortran-devel-4.4.4-12.fc30.x86_64
netcdf-fortran-4.4.4-12.fc30.x86_64

Steps to Reproduce:
1. nf-config --fflags

Actual results:
$ nf-config --fflags
-I/usr/include

Expected results:
$ nf-config --fflags
-I/usr/include -I/usr/lib64/gfortran/modules/

Note that /usr/include contains netcdf.inc which may also be needed for netcdf-using Fortran programs, thus I think /usr/include should be kept in the response.

Additional info:
One workaround, which fixes the problem for me, is to patch /usr/bin/nf-config to return also the module directory:

 includedir=${prefix}/include
+moduledir=/usr/lib64/gfortran/modules/
 
 cc="gcc"
 fc="gfortran"
 cflags=" -I${includedir} " 
-fflags="-I${includedir}"
+fflags="-I${includedir} -I${moduledir}"