I experienced the same thing today. I downloaded sqlite tools to C:\sqlite 
and placed it in the SystemPath. I also installed the MinGW tools that the 
ruby installer offers, i also installed the updates (all three options) but 
when i try to use bundler to create a new rails project i still get this. 
Also when i try to install the gem without bundler. :(

On Wednesday, February 6, 2019 at 12:42:58 AM UTC+1, navarose h wrote:
>
> While creating a new rails project, bundle install complained.
>
> Fetching sqlite3 1.4.0
> Installing sqlite3 1.4.0 with native extensions
> Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
>
> current directory:
> C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/sqlite3-1.4.0/ext/sqlite3
> C:/Ruby24-x64/bin/ruby.exe -r ./siteconf20190205-19788-3qr0ge.rb extconf.
> rb
> checking for sqlite3.h... no
> sqlite3.h is missing. Install SQLite3 from http://www.sqlite.org/ first.
> *** 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=C:/Ruby24-x64/bin/$(RUBY_BASE_NAME)
>         --with-sqlcipher
>         --without-sqlcipher
>         --with-sqlite3-config
>         --without-sqlite3-config
>         --with-pkg-config
>         --without-pkg-config
>         --with-sqlcipher
>         --without-sqlcipher
>         --with-sqlite3-dir
>         --without-sqlite3-dir
>         --with-sqlite3-include
>         --without-sqlite3-include=${sqlite3-dir}/include
>         --with-sqlite3-lib
>         --without-sqlite3-lib=${sqlite3-dir}/lib
>
> To see why this extension failed to compile, please check the mkmf.log 
> which can
> be found here:
>
> C:/Ruby24-x64/lib/ruby/gems/2.4.0/extensions/x64-mingw32/2.4.0/sqlite3-1.4
> .0/mkmf.log
>
> extconf failed, exit code 1
>
> Gem files will remain installed in
> C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/sqlite3-1.4.0 for inspection.
> Results logged to
> C:/Ruby24-x64/lib/ruby/gems/2.4.0/extensions/x64-mingw32/2.4.0/sqlite3-1.4
> .0/gem_make.out
>
> An error occurred while installing sqlite3 (1.4.0), and Bundler cannot 
> continue.
> Make sure that `gem install sqlite3 -v '1.4.0'` succeeds before bundling.
>
> In Gemfile:
>   sqlite3
>
> C:\Users\rose\railsprojects>
>
>
>
>
> So I have decided to build sqlite3 using mingw64.
> Once thats done I tried to install the gem using command
>
>
> gem install sqlite3 --platform=ruby -- --with-sqlite3-include=C:\sqlite\ 
> --with-sqlite3-lib=C:\sqlite\.libs\
>
> C:/RailsInstaller/Ruby2.3.3/bin/ruby.exe -r ./siteconf20190205-18436-
> ve1008.rb extconf.rb --with-sqlite3-include=C:\sqlite\ --with-sqlite3-lib=
> C:\sqlite\.libs\
> checking for sqlite3.h... yes
> checking for pthread_create() in -lpthread... no
> checking for main() in -ldl... no
> checking for dlopen()... no
> missing function dlopen
> *** extconf.rb failed ***
> Could not create Makefile due to some reason, probably lack of necessary
> libraries and/or headers.  Check the mkmf.log file for more details.  You 
> may
> need configuration options.
>
> Provided configuration options:
>         --with-opt-dir
>         --without-opt-dir
>         --with-opt-include
>         --without-opt-include=${opt-dir}/include
>         --with-opt-lib
>         --without-opt-lib=${opt-dir}/lib
>         --with-make-prog
>         --without-make-prog
>         --srcdir=.
>         --curdir
>         --ruby=C:/RailsInstaller/Ruby2.3.3/bin/$(RUBY_BASE_NAME)
>         --with-sqlcipher
>         --without-sqlcipher
>         --with-sqlite3-config
>         --without-sqlite3-config
>         --with-pkg-config
>         --without-pkg-config
>         --with-sqlcipher
>         --without-sqlcipher
>         --with-sqlite3-dir
>         --without-sqlite3-dir
>         --with-sqlite3-include=${sqlite3-dir}/include
>         --with-sqlite3-lib=${sqlite3-dir}/lib
>         --with-pthreadlib
>         --without-pthreadlib
>         --with-dllib
>         --without-dllib
>
> To see why this extension failed to compile, please check the mkmf.log 
> which can be found here:
>
>   C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/extensions/x86-mingw32/
> 2.3.0/sqlite3-1.4.0/mkmf.log
>
> extconf failed, exit code 1
>
> Gem files will remain installed in C:/RailsInstaller/Ruby2.3.3/lib/ruby/
> gems/2.3.0/gems/sqlite3-1.4.0 for inspection.
> Results logged to C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/
> extensions/x86-mingw32/2.3.0/sqlite3-1.4.0/gem_make.out
> ruby-on-rails ruby-on-rails-5
> shareeditdeleteflag
>
>
> ```
>
> Its complaining about dlopen.
> Any clue?
>
> My ruby version is
> `ruby 2.3.3p222 (2016-11-21 revision 56859) [i386-mingw32]`
>

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