# Problem with mkmf-gnome2.rb in 0.17.0-rc1 **URL:** \ **Category:** Ruby-Gnome 2\ **Created:** [June 21, 2008, 11:50pm UTC](https://www.ruby-forum.com/t/problem-with-mkmf-gnome2-rb-in-0-17-0-rc1/141092 "2008-06-21T23:50:44Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [June 21, 2008, 11:50pm UTC](https://www.ruby-forum.com/t/problem-with-mkmf-gnome2-rb-in-0-17-0-rc1/141092/1 "2008-06-21T23:50:44Z")
When trying to use my extconf.rb, with content: -=-=----=-=----=-=----=-=----=-=— =begin extconf.rb for booh lib additions =end PACKAGE\_NAME = “booh/libadds” #- some adds to Gdk::Pixbuf require ‘mkmf-gnome2’ PKGConfig.have\_package(‘gtk±2.0’) or exit 1 have\_func(“gdk\_pixbuf\_set\_option”) have\_header(“gdk-pixbuf/gdk-pixbuf-io.h”) #- direct exiv2 access for some EXIF stuff PKGConfig.have\_package(‘exiv2’) or exit 1 #- does it do something good, actually? setup\_win32(PACKAGE\_NAME) create\_makefile\_at\_srcdir(PACKAGE\_NAME, ‘.’) -=-=----=-=----=-=----=-=----=-=— and mkmf-gnome2.rb, the following output is produced: -=-=—=-=—=-=—=-=—=-=—=-=– checking for GCC… yes checking for rb\_define\_alloc\_func() in ruby.h… yes checking for rb\_block\_proc() in ruby.h… yes checking for new allocation framework… yes checking for attribute assignment… yes checking for gtk±2.0… yes checking for gdk\_pixbuf\_set\_option()… yes checking for gdk-pixbuf/gdk-pixbuf-io.h… yes checking for exiv2… yes checking for G\_PLATFORM\_WIN32… no \*\*\* extconf.rb failed \*\*\* Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: –with-opt-dir –without-opt-dir –with-opt-include –without-opt-include=${opt-dir}/include –with-opt-lib –without-opt-lib=${opt-dir}/lib –with-make-prog –without-make-prog –srcdir=. –curdir –ruby=/usr/bin/ruby –with-pkg-config –without-pkg-config /usr/lib/ruby/site\_ruby/1.8/mkmf-gnome2.rb:141:in `create_makefile_at_srcdir': undefined method `+’ for nil:NilClass (NoMethodError) from extconf.rb:19 -=-=—=-=—=-=—=-=—=-=—=-=– Instrumenting before the line 141, I can see that “srcdir” is “.” and “base\_dir” is “ext”, which effectively doesn’t give an apprently awaited result to “srcdir.rindex(base\_dir)” (my extconf.rb is in the subdirectory “ext” of my project). I don’t know exactly what the code is trying to do, so I cannot suggest a fix, sorry. Reverting commit 2504 workarounds the problem though. – Guillaume C. - [http://zarb.org/~gc/](http://zarb.org/~gc/) ---
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [June 22, 2008, 7:37am UTC](https://www.ruby-forum.com/t/problem-with-mkmf-gnome2-rb-in-0-17-0-rc1/141092/2 "2008-06-22T07:37:55Z")
Hi, 2008/6/22 Guillaume C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > is trying to do, so I cannot suggest a fix, sorry. Reverting commit > 2504 workarounds the problem though. # What about the following patch?Index: src/lib/mkmf-gnome2.rb — src/lib/mkmf-gnome2.rb (revision 3256) +++ src/lib/mkmf-gnome2.rb (working copy) @@ -138,7 +138,10 @@ def create\_makefile\_at\_srcdir(pkg\_name, srcdir, defs = nil) base\_dir = File.basename(Dir.pwd) - builddir = srcdir[(srcdir.rindex(base\_dir) + base\_dir.size + 1)…-1] - last\_common\_index = srcdir.rindex(base\_dir) - if last\_common\_index - builddir = srcdir[(last\_common\_index + base\_dir.size + 1)…-1] - end builddir ||= “.” FileUtils.mkdir\_p(builddir) And your extconf.rb should use File.dirname( **FILE** ) instead of “.” to support building your .so in other (not source) directory: diff --git a/ext/extconf.rb b/ext/extconf.rb index 785e552…a591f1b 100644 — a/ext/extconf.rb +++ b/ext/extconf.rb @@ -16,4 +16,4 @@ PKGConfig.have\_package(‘exiv2’) or exit 1 #- does it do something good, actually? setup\_win32(PACKAGE\_NAME) -create\_makefile\_at\_srcdir(PACKAGE\_NAME, ‘.’) +create\_makefile\_at\_srcdir(PACKAGE\_NAME, File.dirname( **FILE** )) ## Thanks, kou ---
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [June 23, 2008, 12:06am UTC](https://www.ruby-forum.com/t/problem-with-mkmf-gnome2-rb-in-0-17-0-rc1/141092/3 "2008-06-23T00:06:49Z")
> - if last\_common\_index > - builddir = srcdir[(last\_common\_index + base\_dir.size + 1)…-1] > - end > builddir ||= “.” > FileUtils.mkdir\_p(builddir) Works better, thanks. > And your extconf.rb should use File.dirname( **FILE** ) instead of “.” > to support building your .so in other (not source) directory: thanks! – Guillaume C. - [Guillaume Cottenceau](http://zarb.org/~gc/)