I am compiling ruby ruby 1.9.3dev (2011-02-27 trunk 30970) [i686-linux] from
git clone https://github.com/sorah/ruby.git
running make results in this warning
** NATIVETHREAD SUPPORT MODE WARNING: ** ** Ruby is compiled with --enable-pthread, but your Tcl/Tk library ** seems to be compiled without nativethread support. Although you can ** create the tcltklib library, this combination may cause errors (e.g. ** hangs or segmentation faults). If you have no reason to keep the ** current nativethread support status, we recommend you reconfigure and ** recompile the libraries so that both or neither support nativethreads. ** ** If you want change the status of nativethread support, please recompile ** Ruby without "--enable-pthread" configure option (If you use Ruby 1.9.x ** or later, you cannot remove this option, because it requires native- ** thread support.) or recompile Tcl/Tk with "--enable-threads" configure ** option (if your Tcl/Tk is later than or equal to Tcl/Tk 8.1).