在我新安装的 2020 Cygwin 中，pdflatex无法识别\makebackcover：
<...snip...>
LaTeX Warning: Rerun to get acronym list right.
[43]
LaTeX Font Info: Font shape `T1/phv/m/n' will be
(Font) scaled to size 5.69998pt on input line 2946.
LaTeX Font Info: Font shape `T1/phv/m/n' will be
(Font) scaled to size 6.64998pt on input line 2946.
[44
]
! Undefined control sequence.
l.2949 \makebackcover
? X
<...snip...>
网络搜索揭示这\makebackcover是软件包的一部分upmethodology，我已经有了：
$ tlmgr list --only-installed
<...snip...>
i updmap-map: auto-generated font map files
i upmethodology: Writing specifications such as for UP-based methodologies
i uppunctlm: Always keep upright shape for some punctuation marks and Arabic numerals
<...snip...>
在我的设置中，它是 Cygwin 的一部分texlive-collection-latexextra包裹
除了检查包裹外，我还可以做什么来获得\makebackcover认可？
故障排除
我没有从文档源代码中调用任何与 upmethodology 相关的文件。如果调用了任何文件，这可能是由我使用的公司模板直接或间接调用的。公司模板驻留在用户特定的文件子树中texmf，由 bash 环境变量指定：export TEXMFHOME=texmf。我递归地在子树中查找upmethodology，但什么也没找到；因此，upmethodology
必须通过其他包间接调用，甚至可能是从我的文档源文件中调用。
有 14 个文件名来自2020Cygwin 的texlive-collection-latexextra包裹包含字符串upmethodology：
usr/share/texmf-dist/bibtex/bst/upmethodology/upmplainnat.bst
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-backpage.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-code.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-document.cls
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-document.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-extension.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-fmt.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-frontpage.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-p-common.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-spec.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-task.sty
usr/share/texmf-dist/tex/latex/upmethodology/upmethodology-version.sty
usr/share/texmf-dist/tex/latex/upmethodology/UPMVERSION.def
usr/share/tlpkg/tlpobj/upmethodology.tlpobj
我都有。如果我grep将它们用于，我会得到以下结果makebackcover：
.../upmethodology-backpage.sty: \global\let\makebackcover\relax%
.../upmethodology-backpage.sty: \gdef\makebackcover{
.../upmethodology-document.cls: \ifupm@package@docclazz@addbackcover\makebackcover\fi%
我回到了2015Cygwin 安装，我使用相同的用户级别texmf，没有收到\makebackcover错误。我搜索了上述 14 个文件：
$find /usr/share/ -name '*upmethodology*' -type f
我得到的文件几乎和上面一样。唯一的例外是 2015 年的安装不是以下 3 个文件：
usr/share/texmf-dist/bibtex/bst/upmethodology/upmplainnat.bst
usr/share/texmf-dist/tex/latex/upmethodology/UPMVERSION.def
usr/share/tlpkg/tlpobj/upmethodology.tlpobj
我还可以grep查看 2015 年的文件makebackcover：
$grep makebackcover $(find /usr/share/ -name '*upmethodology*')
.../upmethodology-backpage.sty: \global\let\makebackcover\relax%
.../upmethodology-backpage.sty: \gdef\makebackcover{
.../upmethodology-document.cls: \makebackcover%
与 2020 年结果的唯一区别是第 3 行。2020 年版本似乎是\makebackcover有条件调用的。在不知道这些文件如何工作的情况下，似乎有条件调用
\makebackcover不应该改变它是否被定义。我不愿意修改这些系统范围的文件。
vimdiff我没有去处理系统文件，而是查看了pdflatex
*.log2015 和 2020 安装的文件，没有发现任何明显的迹象表明\makebackcover2020 下的错误是由什么原因造成的。诚然，我并不认识列出的许多软件包。文本“upmethodology”也没有出现在两个日志文件中。同样，文本“makebackcover”没有出现在 2015 日志文件中，它出现在 2020 日志文件中的唯一原因似乎是因为它导致了错误。
我的下一步是追踪 2015 年安装是如何定义的，
\makebackcover即寻找一种方法来跟踪包的调用。基于LaTeX 社区，我也寻找了有关地点的线索\backpage。我发现此代码用于跟踪包调用，但它因一系列我无法解释的错误而中断。根据 David Carlisle 的建议，我vimdiff使用
pdflatex2015 年和 2020 年安装的终端输出来比较包调用。
不幸的是，我错误地认为这种跟踪会揭示\makebackcover或\backpage设置的位置。下面，我捕获了 2015 年和 2020 年安装之间的差异作为 HTML，对其进行压缩，并使用 进行编码base64。需要将其保存到（例如）Diff.html.zip.b64，然后使用 进行解码base64 -d Diff.html.zip.b64 > Diff.html.zip。
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