sage -t --long --random-seed=0 sage/src/sage/arith/long.pxd
**********************************************************************
File "sage/src/sage/arith/long.pxd", line 116, in sage.arith.long.integer_check_long
Failed example:
    cython('''
    from sage.arith.long cimport *
    from sage.rings.integer cimport smallInteger
    def check_long(x):
        cdef long value
        cdef int err
        cdef bint c = integer_check_long(x, &value, &err)
        if c:
            if err == 0:
                return value
            elif err == ERR_OVERFLOW:
                raise OverflowError("integer_check_long: overflow")
        elif err == ERR_TYPE:
            raise TypeError("integer_check_long: wrong type")
        elif err == ERR_INDEX:
            raise TypeError("integer_check_long: bad __index__")
        assert False
    from libc.limits cimport LONG_MIN, LONG_MAX
    def long_min():
        return smallInteger(LONG_MIN)
    def long_max():
        return smallInteger(LONG_MAX)
    ''')
Exception raised:
    Traceback (most recent call last):
      File "sage/misc/cachefunc.pyx", line 996, in sage.misc.cachefunc.CachedFunction.__call__ (build/cythonized/sage/misc/cachefunc.c:5970)
        return self.cache[k]
    KeyError: ((), ())

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/usr/lib/python3/dist-packages/sage/doctest/forker.py", line 718, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/usr/lib/python3/dist-packages/sage/doctest/forker.py", line 1137, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.arith.long.integer_check_long[0]>", line 1, in <module>
        cython('''
      File "sage/misc/lazy_import.pyx", line 362, in sage.misc.lazy_import.LazyImport.__call__ (build/cythonized/sage/misc/lazy_import.c:4049)
        return self.get_object()(*args, **kwds)
      File "/usr/lib/python3/dist-packages/sage/misc/cython.py", line 661, in cython_compile
        return cython_import_all(tmpfile, get_globals(), **kwds)
      File "/usr/lib/python3/dist-packages/sage/misc/cython.py", line 551, in cython_import_all
        m = cython_import(filename, **kwds)
      File "/usr/lib/python3/dist-packages/sage/misc/cython.py", line 526, in cython_import
        name, build_dir = cython(filename, **kwds)
      File "/usr/lib/python3/dist-packages/sage/misc/cython.py", line 284, in cython
        standard_libs, standard_libdirs, standard_includes, aliases = _standard_libs_libdirs_incdirs_aliases()
      File "sage/misc/cachefunc.pyx", line 1001, in sage.misc.cachefunc.CachedFunction.__call__ (build/cythonized/sage/misc/cachefunc.c:6098)
        w = self.f(*args, **kwds)
      File "/usr/lib/python3/dist-packages/sage/misc/cython.py", line 50, in _standard_libs_libdirs_incdirs_aliases
        aliases = cython_aliases()
      File "/usr/lib/python3/dist-packages/sage/env.py", line 475, in cython_aliases
        aliases[var + "CFLAGS"] = pkgconfig.cflags(lib).split()
      File "/usr/lib/python3/dist-packages/pkgconfig/pkgconfig.py", line 144, in cflags
        _raise_if_not_exists(package)
      File "/usr/lib/python3/dist-packages/pkgconfig/pkgconfig.py", line 103, in _raise_if_not_exists
        raise PackageNotFoundError(package)
    pkgconfig.pkgconfig.PackageNotFoundError: m4ri not found