hugo + matplotlib usetex dependencies

hugo/content/installation/building/unix/third-party.md

@@ -28,7 +28,12 @@ including `algorithm/string`, `bimap`, `geometry`, `numeric/interval`, `polymorp
 
 Recommended software:
 
-* `perl` (for generating a man page)
+* For generating a man page:
+  * `perl`
+* For [Matplotlib usetex mode]({{% ref-py "result/matplotlib.md" %}}):
+  * `texlive-latex-extra` (and dependencies)
+  * `dvipng`
+  * `cm-super-minimal`
 
 All these can be easily installed on most Linux distributions using
 the system's package manager. Below are a few examples for several