install 2.5.1

$ rvm get head && rvm install 2.5.1
Found old RVM 1.29.7-next - updating.
Downloading https://get.rvm.io
No GPG software exists to validate rvm-installer, skipping.
Downloading https://github.com/rvm/rvm/archive/master.tar.gz
Upgrading the RVM installation in /Users/mal/.rvm/
    RVM PATH line found in /Users/mal/.mkshrc /Users/mal/.profile /Users/mal/.bashrc /Users/mal/.zshrc.
    RVM sourcing line found in /Users/mal/.profile /Users/mal/.bash_profile /Users/mal/.zlogin.
    Fixing environment for ruby-2.6.1.
    Installing rvm gem in 1 gemsets.
    Installing gem-wrappers gem in 1 gemsets.
    Regenerating gem wrappers in 1 rubies.
Upgrade of RVM in /Users/mal/.rvm/ is complete.

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RVM reloaded!
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.14/x86_64/ruby-2.5.1.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Certificates bundle '/usr/local/etc/openssl@1.1/cert.pem' is already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/mal/.rvm/rubies/ruby-2.5.1, this may take a while depending on your cpu(s)...
ruby-2.5.1 - #downloading ruby-2.5.1, this may take a while depending on your connection...
ruby-2.5.1 - #extracting ruby-2.5.1 to /Users/mal/.rvm/src/ruby-2.5.1.....
ruby-2.5.1 - #applying patch /Users/mal/.rvm/patches/ruby/2.5.1/libressl_2_7.patch.
ruby-2.5.1 - #configuring......................................................|
ruby-2.5.1 - #post-configuration.
ruby-2.5.1 - #compiling........................................................-
ruby-2.5.1 - #installing.........
ruby-2.5.1 - #making binaries executable..
ruby-2.5.1 - #downloading rubygems-3.0.2
ruby-2.5.1 - #extracting rubygems-3.0.2......
ruby-2.5.1 - #removing old rubygems........
ruby-2.5.1 - #installing rubygems-3.0.2.
Error running 'env GEM_HOME=/ruby-2.5.1@global GEM_PATH= /Users/mal/.rvm/rubies/ruby-2.5.1/bin/ruby -d /Users/mal/.rvm/src/rubygems-3.0.2/setup.rb --no-document',
please read /Users/mal/.rvm/log/1549548408_ruby-2.5.1/rubygems.install.log