Was trying to run bundle install for a Ruby on Rails project which required gem curb. Here's what happened:
gem install curb
Fetching curb-0.9.11.gem
Building native extensions. This could take a while...
ERROR: Error installing curb:
ERROR: Failed to build gem native extension.
current directory: /home/lance/.rvm/gems/ruby-2.6.4/gems/curb-0.9.11/ext
/usr/share/rvm/rubies/ruby-2.6.4/bin/ruby -I /usr/share/rvm/rubies/ruby-2.6.4/lib/ruby/site_ruby/2.6.0 -r ./siteconf20210120-31208-z4fk7m.rb extconf.rb
checking for curl-config... no
checking for -lcurl... no
*** 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. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/share/rvm/rubies/ruby-2.6.4/bin/$(RUBY_BASE_NAME)
--with-curl-dir
--without-curl-dir
--with-curl-include
--without-curl-include=${curl-dir}/include
--with-curl-lib
--without-curl-lib=${curl-dir}/lib
--with-curllib
--without-curllib
extconf.rb:18:in `<main>': Can't find libcurl or curl/curl.h (RuntimeError)
Try passing --with-curl-dir or --with-curl-lib and --with-curl-include
options to extconf.
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/home/lance/.rvm/gems/ruby-2.6.4/extensions/x86_64-linux/2.6.0/curb-0.9.11/mkmf.log
extconf failed, exit code 1