Gosu depends on libmpg123, libmpg123 depends on MSVC 2015 runtime

[Aelxer]

I'm rather new to Ruby (that is to say, I'm not very familiar with most of its technical details) and I wanted to try gosu when I found out about it, but while I was able to install the gem without problems (or at least, no problems showed up), I haven't been able to make it work. I tried running gosu-examples and an example from the tutorial but no matter what I do, if it requires gosu I'll get this error:

C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require': 126: No se puede encontrar el m¾dulo especificado. - C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gosu-0.12.0-x64-mingw32/lib64/2.3/gosu.so (LoadError) from C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gosu-0.12.0-x64-mingw32/lib/gosu.rb:17:in <top (required)>' from C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in require'
from C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:127:in rescue in require' from C:/Ruby23-x64/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:40:in require'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gosu-examples-1.0.4/bin/gosu-examples:4:in <top (required)>' from C:/Ruby23-x64/bin/gosu-examples:22:in load'
from C:/Ruby23-x64/bin/gosu-examples:22:in `

'

Most solutions I've found that deal with the problem even tangentially are either really old (and thus deal with older versions of Ruby and gosu) or are similar but not related to gosu and I haven't been able to apply them to it. Any suggestion on what to do is appreciated.

[jlnr]

Hmm. I think I've seen two other reports like this, one on IRC and I can't find the other.

This happens when Ruby loads Gosu, and a DLL that Gosu depends on cannot be found. Are you on Windows 7 or 10?

One thing you can try is this:

• Copy C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gosu-0.12.0-x64-mingw32/lib64/2.3/gosu.so up one directory (into lib64) and rename it "gosu.dll"
• Download the 64-bit version of Dependency Walker: http://www.dependencywalker.com
• Open gosu.dll in Dependency Walker and report any DLLs that are missing; probably best to post a screenshot.

Some of the missing DLLs are not a problem, they are supplied by Ruby. But maybe you are missing a Visual C++ runtime of some sort.

[Aelxer]

I'm on Windows 7.

I'm hoping I did it right >.<

[jlnr]

Hmmm. I think it's missing VCRUNTIME140.DLL - can you please try installing the MSVC 2015 runtime?

It's supposed to be linked statically, but maybe I messed up when integrating mpg123 in Gosu 0.12.0?

[jlnr]

Yep, looks like it. Thanks for reporting. I'll try to recompile mpg123 so that it doesn't introduce this dependency.

[Aelxer]

It worked! Thank you very much.