* Package:    app-doc/mathjax-docs-2.7.7
 * Repository: gentoo
 * Maintainer: gienah@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_musl kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking mathjax-docs-2.7.7.tar.gz to /var/tmp/portage/app-doc/mathjax-docs-2.7.7/work
>>> Source unpacked in /var/tmp/portage/app-doc/mathjax-docs-2.7.7/work
>>> Preparing source in /var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388 ...
Running Sphinx v3.0.3
making output directory... done
/var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388/conf.py:102: RemovedInSphinx40Warning: The app.add_stylesheet() is deprecated. Please use app.add_css_file() instead.
  app.add_stylesheet( "custom.css" )

Theme error:
sphinx_rtd_theme is no longer a hard dependency since version 1.4.0. Please install it manually.(pip install sphinx_rtd_theme)
 * ERROR: app-doc/mathjax-docs-2.7.7::gentoo failed (compile phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line  125:  Called src_compile
 *   environment, line 1956:  Called build_sphinx '/var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388'
 *   environment, line  748:  Called die
 * The specific snippet of code:
 *       sphinx-build -b html -d "${dir}"/_build/doctrees "${dir}" "${dir}"/_build/html || die;
 * 
 * If you need support, post the output of `emerge --info '=app-doc/mathjax-docs-2.7.7::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-doc/mathjax-docs-2.7.7::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-doc:mathjax-docs-2.7.7:20200430-150616.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-doc/mathjax-docs-2.7.7/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-doc/mathjax-docs-2.7.7/temp/environment'.
 * Working directory: '/var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388'
 * S: '/var/tmp/portage/app-doc/mathjax-docs-2.7.7/work/MathJax-docs-9d711f40638202b02f2154d7f05ea35088ff9388'