Issue #8435 has been updated by romuloceccon (Romulo Ceccon).


Workaround is to specify actual location of tcl/tk files:

    ./configure --with-tclConfig-file=/usr/lib/x86_64-linux-gnu/tclConfig.sh --with-tkConfig-file=/usr/lib/x86_64-linux-gnu/tkConfig.sh

It looks like the change in the *.sh scripts intend to improve support for DEB_HOST_MULTIARCH. I don't know how prevalent the problem will be for other platforms, or what the policy is for Ruby regarding that kind of workaround.
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Bug #8435: Can't build tcl/tk extensions after updating Debian/Ubuntu package
https://bugs.ruby-lang.org/issues/8435#change-39488

Author: romuloceccon (Romulo Ceccon)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.1.0dev (2013-05-21 trunk 40883) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


I've recently upgraded my Ubuntu system to 13.04 and tcl8.5-dev and tk8.5-dev were updated as well (to versions 8.5.13-1ubuntu and 8.5.11-2ubuntu4 respectively).

Now I can't build Tcl/Tk Ruby extensions anymore. I was able to reproduce the problem with
  ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-linux] and
  ruby 2.1.0dev (2013-05-21 trunk 40883) [x86_64-linux].

Looking at source:/ext/tk/extconf.rb@39974#L376 I see that extconf tries to parse tclConfig.sh and tkConfig.sh, which worked nice previously when those files were ln'ed to the actual configuration files. However, after the update they look like this on my platform:

    $ cat /usr/lib/tclConfig.sh 
    #!/bin/sh
    . /usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH`/tclConfig.sh
    $ cat /usr/lib/tkConfig.sh 
    #!/bin/sh
    . /usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH`/tkConfig.sh

So the setup fails:

    ...
    Search tclConfig.sh and tkConfig.sh.....................
    WARNING: found "/usr/lib/tclConfig.sh", but cannot find valid Tcl library for the tclConfig.sh. So, ignore it.
    
    WARNING: found "/usr/lib/tkConfig.sh", but cannot find valid Tk library for the tkConfig.sh. So, ignore it.
    ..........
    Fail to find [tclConfig.sh, tkConfig.sh]
    ...

Full 'ruby extconf.rb' output and mkmf.log are attached.


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