From: buck@...9000.localdomain (Buck Pyland)
Date: 2001-08-25T11:32:48+09:00
Subject: [ruby-talk:20344] Re: Compiling Ruby with cygwin and Tk support

In article <20010816154049.A26853@acc.umu.se>, Niklas Frykholm wrote:
> On Thu, Aug 16, 2001 at 07:14:06PM +0900, Manuel Zabelt wrote:
>> $ ruby extconf.rb
>> checking for tcl.h... yes
>> checking for tk.h... no
>> 
>> The tcl.h and tk.h file both rest in /usr/include.
>> Why the heck is tcl.h found and tk.h isn't?
> 
> Ruby does not only check for existence of the file, it checks that it is
> OK to include the file in a program. The problem is that <tk.h> includes
> X11-header files which are not normally distributed in a cygwin environment.
> You need to get the missing X11-header files, for example by downloading
> xfree86 for cygwin (a link was posted here a couple of days ago) and 
> put them in the right directories.
> 
> I, for one, think that ruby should be more clear about this (an error or
> warning should be printed when compiling). As it is now, most users who
> try to compile under cygwin will get no warning or error message, but Tk
> will simply not work. Finding out why requires a somewhat time-consuming
> investigation.
> 
> // Niklas
> 
> 

This is correct. /usr/include/tk.h includes <X11/Xlib.h> which only exists if
you have X11R6 installed. Getting past this, however, I had to modify the
generated Makefiles in both ext/tcltklib and ext/tk to add the
/usr/X11R6/include and /usr/X11R6/lib to CPPFLAGS and LDFLAGS variables,
respectively. I recalled something about the
--with-(tcl|tk)-(includes|libraries) options in a newsgroup or webpage before,
but these were not documented in the configure script. I guess I did it the
hard way, but it worked. :)


-- 
Buck Pyland
buckpyland@home.com