EBoisseauSierra commented on a change in pull request #14102:
URL: https://github.com/apache/superset/pull/14102#discussion_r613838361



##########
File path: CONTRIBUTING.md
##########
@@ -418,22 +420,23 @@ For example, the image referenced above actually lives in 
`superset-frontend/ima
 
 #### OS Dependencies
 
-Make sure your machine meets the [OS 
dependencies](https://superset.apache.org/docs/installation/installing-superset-from-scratch#os-dependencies)
 before following these steps.
+Make sure your machine meets the [OS 
dependencies](https://superset.apache.org/docs/installation/installing-superset-from-scratch#os-dependencies)
 before following these steps.  
+You also need to install MySQL or [MariaDB](https://mariadb.com/downloads).

Review comment:
       ~~Oh, that might well be required in the tests as well (I suppose due to 
[`psycopg`](https://github.com/apache/superset/blob/master/requirements/development.txt#L26)).~~
 
   Actually, I tried to install Superset (1.1.0) on a _blank_ F32 VM (`rpm -qa 
| grep postgres` returns empty) alongside its test dependencies (cf. #14052 ) 
and, up to running the tests themselves (`$ tox`), no issue was raised (unlike 
for MySQL). 
   
   Do we agree we only want to mention these OS dependencies in the “set up 
your system to run the tests” (and not in the [install from 
scratch](https://github.com/apache/superset/blob/master/docs/src/pages/docs/installation/installing_scratch.mdx)
 docs), as we wouldn't want users to install both RDBMS by default?




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