#1141018 ruby-gnome: FTBFS: x86_64-linux-gnu-gcc: error: unrecognized command-line option '-Wout-of-line-declaration'; did you mean '-Wold-style-declaration'?

Package:
src:ruby-gnome
Source:
src:ruby-gnome
Submitter:
Santiago Vila
Date:
2026-06-28 20:56:26 UTC
Severity:
normal
Tags:
#1141018#5
Date:
2026-06-28 20:52:26 UTC
From:
To:
Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202606/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:ruby-gnome, so that this is still
visible in the BTS web page for this package.

Thanks.
--------------------------------------------------------------------------------
[...]
 debian/rules clean
dh clean --buildsystem=ruby --with ruby
   dh_auto_clean -O--buildsystem=ruby
	dh_ruby --clean
W: XS-Ruby-Versions is deprecated, and will be ignored
   dh_autoreconf_clean -O--buildsystem=ruby
   dh_clean -O--buildsystem=ruby
 debian/rules binary
dh binary --buildsystem=ruby --with ruby
   dh_update_autotools_config -O--buildsystem=ruby
   dh_autoreconf -O--buildsystem=ruby
   dh_auto_configure -O--buildsystem=ruby
	dh_ruby --configure
   dh_auto_build -O--buildsystem=ruby
	dh_ruby --build

[... snipped ...]

--------------------

try_compiler_option: checking for -Wall option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -o conftest -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection conftest.c  -L. -L/usr/lib/x86_64-linux-gnu -L. -Wl,-z,relro -Wl,-z,now -fstack-protector-strong -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed     -lruby-3.3  -lm -lpthread  -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return !!argv[argc];
6: }
/* end */

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection  -Wall -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wcast-align option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall  -Wcast-align -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wextra option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align  -Wextra -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wformat=2 option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra  -Wformat=2 -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Winit-self option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2  -Winit-self -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wlarger-than-65500 option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self  -Wlarger-than-65500 -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wmissing-declarations option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500  -Wmissing-declarations -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wmissing-format-attribute option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations  -Wmissing-format-attribute -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wmissing-include-dirs option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute  -Wmissing-include-dirs -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wmissing-noreturn option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs  -Wmissing-noreturn -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wmissing-prototypes option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn  -Wmissing-prototypes -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wnested-externs option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wmissing-prototypes  -Wnested-externs -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wold-style-definition option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wmissing-prototypes -Wnested-externs  -Wold-style-definition -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wpacked option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wmissing-prototypes -Wnested-externs -Wold-style-definition  -Wpacked -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wp,-D_FORTIFY_SOURCE=2 option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked  -Wp,-D_FORTIFY_SOURCE=2 -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wpointer-arith option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked -Wp,-D_FORTIFY_SOURCE=2  -Wpointer-arith -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wundef option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gnu-gcc -I/usr/include/x86_64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wcast-align -Wextra -Wformat=2 -Winit-self -Wlarger-than-65500 -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-noreturn -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked -Wp,-D_FORTIFY_SOURCE=2 -Wpointer-arith  -Wundef -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wout-of-line-declaration option to compiler... -------------------- no

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gn [too-long-redacted] laration -Werror -c conftest.c"
x86_64-linux-gnu-gcc: error: unrecognized command-line option ‘-Wout-of-line-declaration’; did you mean ‘-Wold-style-declaration’?
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wunsafe-loop-optimizations option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gn [too-long-redacted] izations -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

try_compiler_option: checking for -Wwrite-strings option to compiler... -------------------- yes

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gn [too-long-redacted] -strings -Werror -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
/* end */



--------------------

have_package: checking for cairo-gobject... -------------------- yes (1.18.4)



--------------------

have_package: checking for cairo... -------------------- yes (1.18.4)



--------------------

have_header: checking for rb_cairo.h... -------------------- no

LD_LIBRARY_PATH=.:/usr/lib/x86_64-linux-gnu "x86_64-linux-gn [too-long-redacted] ings -pthread    -c conftest.c"
cc1: warning: /usr/lib/x86_64-linux-gnu/rubygems-integration/3.3.0/gems/cairo-1.18.5/ext/cairo/../../lib: No such file or directory [-Wmissing-include-dirs]
conftest.c:3:10: fatal error: rb_cairo.h: No such file or directory
    3 | #include <rb_cairo.h>
      |          ^~~~~~~~~~~~
compilation terminated.
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <rb_cairo.h>
/* end */



--------------------

/usr/lib/ruby/vendor_ruby/rubygems/ext/builder.rb:126:in `run': extconf failed, exit code 1 (Gem::InstallError)
	from /usr/lib/ruby/vendor_ruby/rubygems/ext/ext_conf_builder.rb:30:in `build'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:81:in `block in build_and_install'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:71:in `chdir'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:71:in `build_and_install'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:115:in `block in build_all_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:112:in `each'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:112:in `build_all_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb:128:in `<main>'
~~~~~~~~~~~~~~~~~~~~~ ↑ mkmf.log ~~~~~~~~~~~~~~~~~~~~~
/usr/lib/ruby/vendor_ruby/gem2deb.rb:52:in `run': /usr/bin/ruby3.3 /usr/lib/ruby/vendor_ruby/gem2deb/extension_builder.rb /<<PKGBUILDDIR>>/cairo-gobject debian/ruby-cairo-gobject (Gem2Deb::CommandFailed)
	from /usr/lib/ruby/vendor_ruby/gem2deb.rb:64:in `block in run_ruby'
	from /usr/lib/ruby/vendor_ruby/gem2deb.rb:87:in `maybe_crossbuild'
	from /usr/lib/ruby/vendor_ruby/gem2deb.rb:63:in `run_ruby'
	from /usr/lib/ruby/vendor_ruby/gem2deb/installer.rb:62:in `block in install_files_and_build_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/installer.rb:59:in `each'
	from /usr/lib/ruby/vendor_ruby/gem2deb/installer.rb:59:in `install_files_and_build_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/installer.rb:28:in `build'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:54:in `block in install'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:52:in `each'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:52:in `install'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:163:in `install'
	from /usr/bin/dh_ruby:89:in `<main>'
dh_auto_install: error: dh_ruby --install /<<PKGBUILDDIR>>/debian/tmp returned exit code 1
make[1]: *** [debian/rules:31: override_dh_auto_install] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:9: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
--------------------------------------------------------------------------------