Thank you for your suggestion , and it worked on my local machine , ie, ruby-sassc builded on my local machine but it failed when i tried it in sbuild with an error log
dpkg-buildpackage
-----------------
dpkg-buildpackage: info: source package ruby-sassc
dpkg-buildpackage: info: source version 2.0.1-1
dpkg-buildpackage: info: source distribution UNRELEASED
dpkg-source --before-build .
dpkg-buildpackage: info: host architecture amd64
debian/rules clean
dh clean --buildsystem=ruby --with ruby
dh_auto_clean -O--buildsystem=ruby
dh_ruby --clean
dh_ruby --clean
Invalid gemspec in [sassc.gemspec]: No such file or directory - git
Invalid gemspec in [sassc.gemspec.gem2deb]: No such file or directory - git
/usr/lib/ruby/vendor_ruby/gem2deb/metadata.rb:124:in `load_gemspec': E: cannot load gemspec sassc.gemspec (RuntimeError)
from /usr/lib/ruby/vendor_ruby/gem2deb/metadata.rb:34:in `block in initialize'
from /usr/lib/ruby/vendor_ruby/gem2deb/metadata.rb:33:in `chdir'
from /usr/lib/ruby/vendor_ruby/gem2deb/metadata.rb:33:in `initialize'
from /usr/lib/ruby/vendor_ruby/gem2deb/installer.rb:24:in `new'
from /usr/lib/ruby/vendor_ruby/gem2deb/installer.rb:24:in `initialize'
from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:197:in `new'
from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:197:in `block in installers'
from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:196:in `map'
from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:196:in `installers'
from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:43:in `clean'
from /usr/bin/dh_ruby:96:in `<main>'
dh_auto_clean: dh_ruby --clean returned exit code 1
make: *** [debian/rules:7: clean] Error 1
dpkg-buildpackage: error: debian/rules clean subprocess returned exit status 2
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Build finished at 2019-03-22T13:44:48Z
Any guide on how to tackle it would be great
Thank you