Bug 338512 – Ruby-Pango is not working with Cairo

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Stefan Salewski 2010-09-24 00:21:36 UTC]

I am unable to get
/usr/share/doc/ruby-pango-0.19.4/sample/pango_cairo.rb

working. Error message is
"This sample requires Pango 1.0.0 or later and cairo support"
and if I remove "Pango.cairo_available?" I get
pango_cairo.rb:29:in `draw_text': undefined method `create_pango_layout'

I tried reemerging all related ebuild, no success.

One idea:
emerge -av ruby-pango
[ebuild   R   ] dev-ruby/ruby-pango-0.19.4  USE="-test" RUBY_TARGETS="ruby18"

shows

checking for rb_cairo.h... no

I verified with command locate that there is no rb_cairo.h or rbcairo.h available -- may that be a problem?

This is for dev-ruby/rcairo-1.8.5  USE="svg -doc -test" RUBY_TARGETS="ruby18"

Thanks,

Stefan Salewski


Reproducible: Always

[Comment 1 Stefan Salewski 2010-09-24 10:52:52 UTC]

Yes, missing rb_cairo.h seems to be the problem, see
http://rpmfind.net/linux/RPM/fedora/12/x86_64/ruby-cairo-devel-1.8.0-4.fc12.x86_64.html

I just fixed it manually by

cp /var/tmp/portage/dev-ruby/rcairo-1.8.5/work/all/rcairo-1.8.5/ext/cairo/rb_cairo.h //usr/lib64/ruby/site_ruby/1.8/x86_64-linux/

emerge -av ruby-pango

/usr/share/doc/ruby-pango-0.19.4/sample/pango_cairo.rb

works now.

Thanks

Stefan Salewski

[Comment 2 Hans de Graaff 2010-09-27 18:57:18 UTC]

Something else must be going on because I don't have rb_cairo.h on my system either but the pango sample runs fine.

Could you add the full build output to the bug?

[Comment 3 Stefan Salewski 2010-09-27 21:59:07 UTC]

Created attachment 248842 [details]
build.log

[Comment 4 Stefan Salewski 2010-09-27 22:01:31 UTC]

(In reply to comment #2)
> Something else must be going on because I don't have rb_cairo.h on my system
> either but the pango sample runs fine.
> 
> Could you add the full build output to the bug?
> 

Please note, this bug may be related to bug
http://bugs.gentoo.org/show_bug.cgi?id=302943

For 
cp rcairo-1.8.0-r1.ebuild rcairo-1.8.1-r2.ebuild
emerge -av =dev-ruby/rcairo-1.8.1-2
emerge -av ruby-gtk2
emerge -av ruby-gnome2

all is fine.

emerging dev-ruby/rcairo-1.8.5
removes rb_cairo.h but cairo-pong.rb was still working.
But after re-emerging ruby-gtk2 and ruby-gnome2 cairo-pong.rb refuses to work with message "cairo-pong.rb:16: GTK+ 2.8.0 or later and cairo support are requered. (RuntimeError)"

And after 
dev-ruby/ruby-pango-0.19.4  USE="-test" RUBY_TARGETS="ruby18"

I get

stefan@AMD64X2 ~ $ ruby pango_cairo.rb 
This sample requires Pango 1.0.0 or later and cairo support

I will attach the output of
AMD64X2 ruby-pango # pwd
/usr/portage/dev-ruby/ruby-pango
AMD64X2 ruby-pango # ebuild ruby-pango-0.19.4.ebuild install

files build.log and eclass-debug.log

stefan@AMD64X2 ~ $ ls -l /var/tmp/portage/dev-ruby/ruby-pango-0.19.4/temp/          
total 168
-rw-rw-r-- 1 portage portage 54784 Sep 27 23:26 build.log
-rw-rw-r-- 1 root    root     1170 Sep 27 23:25 eclass-debug.log
-rw-r--r-- 1 root    root    96409 Sep 27 23:26 environment
drwxrwxr-x 2 portage portage  4096 Sep 27 23:26 logging
-rw-r--r-- 1 root    root        0 Sep 27 23:26 prepallman.filelist
-rw-r--r-- 1 root    root        0 Sep 27 23:26 ruby-ng-ruby18-mislink.log

[Comment 5 Stefan Salewski 2010-09-27 22:03:02 UTC]

Created attachment 248844 [details]
eclass-debug.log

[Comment 6 Hans de Graaff 2012-04-30 07:01:58 UTC]

Is this still a problem with recent versions of ruby-pango and rcairo?

[Comment 7 Stefan Salewski 2012-04-30 10:14:39 UTC]

(In reply to comment #6)
> Is this still a problem with recent versions of ruby-pango and rcairo?

For me all was working fine after your fix from (2011-05-02 19:10:43 UTC )

https://bugs.gentoo.org/show_bug.cgi?id=302943

Some months ago I switched to ruby 1.9 -- all is working fine including ruby-gnome2, rcairo and ruby-pango.

Thanks,

Stefan Salewski