This package runs into bug 2153037 during its build:

ceph_version_map = collections.OrderedDict(sorted({
    "hammer": "rados_pool_get_base_tier",
    "jewel": "rados_inconsistent_pg_list",
    "kraken": "rados_aio_exec",
    "luminous": "rados_read_op_omap_get_keys2",
}.items(), key=lambda t: t[0]))
[…]
def setup_hook(cmd_obj, version=None):
    if version == "latest":
        version = sorted(ceph_version_map.keys())[-1]
    elif version is None:
        comp = ccompiler.new_compiler(force=True, verbose=True)
        for potential_version, method in ceph_version_map.items():
            msg = "* checking for librados >= %s (with function %s)" % (
                potential_version, method)
            log(msg)
            found = comp.has_function(method, libraries=['rados'])
            if found:
                version = potential_version
                log("%s done: FOUND" % msg)
            else:
                log("%s done: NOT FOUND" % msg)
                break

        if not version:
            raise Exception("gcc, python-dev, librados2 or "
                            "librados-dev >= 0.80 are missing")
[…]

For these functions, upstream CCompiler.has_function only works in (strict) C99 mode if the function can be called without any parameters.

So far, upstream has been unwilling to fix this. A downstream-only fix in the Fedora package will necessarily be partial because many use cases consume the upstream version using pip. So maybe this package should move off has_function.