Missing dependencies for composer
Composer does not run out-of-the box currently. When installing composer, it complains about the iconv function missing.
After installing php7-iconv, it returns a lot of errors like:
PHP Notice: iconv(): Wrong charset, conversion from `ASCII' to `UTF-8//IGNORE' is not allowed in ..
This is solved by installing php7-mbstring.
(from redmine: issue id 9855, created on 2019-01-14)