When a gem fails, where do I find the mkmf.log file?

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Can't find the 'libpq-fe.h header

** extconf.rb failed **

Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details.

Where do I find the mkmf.log file?

rubygems
3 Answers

The mkmf.log file can be found under the gem's installation directory.

rvm

If you are using RVM, then look for a directory similar to

~/.rvm/gems/ruby-1.9.3-p194/gems/some-cool-gem-name/ext/mkmf.log

You can list all the mkmf.log files available with this command:

find ~/.rvm -name mkmf.log

rbenv

find ~/.rbenv -name mkmf.log
user_78520 
find $GEM_HOME -name mkmf.log

or

$GEM_HOME/extensions/$arch/$ruby_version-static/$gem_name-$gem_version/mkmf.log

chruby, ruby-2.6.3:

GEM_HOME: /home/yuri/.gem/ruby/2.6.3
arch: x86_64-linux
ruby_version: 2.6.0
gem_name: openssl
gem_version: 2.0.0

/home/yuri/.gem/ruby/2.6.3/extensions/x86_64-linux/2.6.0-static/openssl-2.0.0/mkmf.log

rvm, ruby-2.6.3:

GEM_HOME: /home/yuri/.rvm/gems/ruby-2.6.3
arch: x86_64-linux
ruby_version: 2.6.0
gem_name: nokogiri
gem_version: 1.10.3

/home/yuri/.gem/ruby/2.6.3/extensions/x86_64-linux/2.6.0-static/nokogiri-1.10.3/mkmf.log
user_524990
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