diff --git a/doc/latex.rst b/doc/latex.rst
index 53fe9301a..35e38acb4 100644
--- a/doc/latex.rst
+++ b/doc/latex.rst
@@ -195,8 +195,8 @@ Keys that you may want to override include:
    "Bjornstrup".  You can also set this to ``''`` to disable fncychap.
 
    Default: ``'\\usepackage[Bjarne]{fncychap}'`` for English documents,
-       ``'\\usepackage[Sonny]{fncychap}'`` for internationalized documents, and
-       ``''`` for Japanese documents.
+   ``'\\usepackage[Sonny]{fncychap}'`` for internationalized documents, and
+   ``''`` for Japanese documents.
 
 ``'preamble'``
    Additional preamble content.  One may move all needed macros into some file
@@ -300,7 +300,7 @@ Keys that don't need to be overridden unless in special cases are:
    "inputenc" package inclusion.
 
    Default: ``'\\usepackage[utf8]{inputenc}'`` when using pdflatex, else
-       ``''``
+   ``''``
 
    .. versionchanged:: 1.4.3
       Previously ``'\\usepackage[utf8]{inputenc}'`` was used for all
@@ -389,7 +389,7 @@ Keys that don't need to be overridden unless in special cases are:
    key is ignored.
 
    Default: ``'\\usepackage{textalpha}'`` or ``''`` if ``fontenc`` does not
-       include the ``LGR`` option.
+   include the ``LGR`` option.
 
    .. versionadded:: 2.0
 
@@ -407,7 +407,7 @@ Keys that don't need to be overridden unless in special cases are:
    <latexsphinxsetup>`.
 
    Default: ``'\\usepackage{geometry}'`` (or
-       ``'\\usepackage[dvipdfm]{geometry}'`` for Japanese documents)
+   ``'\\usepackage[dvipdfm]{geometry}'`` for Japanese documents)
 
    .. versionadded:: 1.5
 
@@ -784,14 +784,14 @@ macros may be significant.
    |warningbdcolors|
        The colour for the admonition frame.
 
-       Default: ``{rgb}{0,0,0}`` (black)
+   Default: ``{rgb}{0,0,0}`` (black)
 
 .. only:: latex
 
    |wgbdcolorslatex|
        The colour for the admonition frame.
 
-       Default: ``{rgb}{0,0,0}`` (black)
+   Default: ``{rgb}{0,0,0}`` (black)
 
 |warningbgcolors|
     The background colours for the respective admonitions.
diff --git a/sphinx/builders/linkcheck.py b/sphinx/builders/linkcheck.py
index f405910e9..cdab77eaa 100644
--- a/sphinx/builders/linkcheck.py
+++ b/sphinx/builders/linkcheck.py
@@ -23,12 +23,12 @@ from typing import Any, Dict, List, NamedTuple, Optional, Set, Tuple, cast
 from urllib.parse import unquote, urlparse
 
 from docutils import nodes
-from docutils.nodes import Element, Node
+from docutils.nodes import Element
 from requests import Response
 from requests.exceptions import HTTPError, TooManyRedirects
 
 from sphinx.application import Sphinx
-from sphinx.builders import Builder
+from sphinx.builders.dummy import DummyBuilder
 from sphinx.deprecation import RemovedInSphinx50Warning
 from sphinx.locale import __
 from sphinx.transforms.post_transforms import SphinxPostTransform
@@ -98,7 +98,7 @@ def check_anchor(response: requests.requests.Response, anchor: str) -> bool:
     return parser.found
 
 
-class CheckExternalLinksBuilder(Builder):
+class CheckExternalLinksBuilder(DummyBuilder):
     """
     Checks for broken external links.
     """
@@ -406,18 +406,6 @@ class CheckExternalLinksBuilder(Builder):
                              lineno, uri + ' to ' + info)
             self.write_linkstat(linkstat)
 
-    def get_target_uri(self, docname: str, typ: str = None) -> str:
-        return ''
-
-    def get_outdated_docs(self) -> Set[str]:
-        return self.env.found_docs
-
-    def prepare_writing(self, docnames: Set[str]) -> None:
-        return
-
-    def write_doc(self, docname: str, doctree: Node) -> None:
-        pass
-
     def write_entry(self, what: str, docname: str, filename: str, line: int,
                     uri: str) -> None:
         with open(path.join(self.outdir, 'output.txt'), 'a') as output: