Using the gem install gem install redis - dump error -=- o solve
Building native extensions. This could take a while...
ERROR: ERROR installing redis - dump:
ERROR: Failed to build the gem native extension.

The current directory:/var/lib/gems/2.5.0/gems/yajl - ruby - 1.4.1/ext/yajl
The/usr/bin/ruby2.5 - r./siteconf20200215-18996 - etisc9. Rb extconf. Rb
Creating a Makefile

The current directory:/var/lib/gems/2.5.0/gems/yajl - ruby - 1.4.1/ext/yajl
Make "DESTDIR=" clean
Sh: 1: the make: not found

The current directory:/var/lib/gems/2.5.0/gems/yajl - ruby - 1.4.1/ext/yajl
Make "DESTDIR="
Sh: 1: the make: not found

Make failed, the exit code 127

Gem files will remain installed in/var/lib/gems/2.5.0/gems/yajl - ruby - 1.4.1 for inspection.
Results logged to/var/lib/gems/2.5.0/extensions/x86_64 - Linux/2.5.0/yajl - ruby - 1.4.1/gem_make out