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Search for other platforms ruby-devel-2.1.5-1.2.sparc.rpm ruby-devel-2.1.5-1.2.alpha.rpm ruby-devel-2.1.5-1.2.ppc.rpm ruby-devel-2.1.5-1.2.ia64.rpm ruby-devel-2.1.5-1.2.s390.rpm

Provides :
pkgconfig(ruby-2.1)
ruby-devel
ruby-devel(x86-32)
ruby21-devel

Requires :

ruby21 = 2.1.5
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsLzma) <= 4.4.6-1
/usr/bin/pkg-config

Content of RPM :
/usr/include/ruby-2.1.0
/usr/include/ruby-2.1.0/i586-linux
/usr/include/ruby-2.1.0/i586-linux/ruby
/usr/include/ruby-2.1.0/i586-linux/ruby/config.h
/usr/include/ruby-2.1.0/ruby
/usr/include/ruby-2.1.0/ruby.h
/usr/include/ruby-2.1.0/ruby/backward
/usr/include/ruby-2.1.0/ruby/backward/classext.h
/usr/include/ruby-2.1.0/ruby/backward/rubyio.h
/usr/include/ruby-2.1.0/ruby/backward/rubysig.h
/usr/include/ruby-2.1.0/ruby/backward/st.h
/usr/include/ruby-2.1.0/ruby/backward/util.h
/usr/include/ruby-2.1.0/ruby/debug.h
/usr/include/ruby-2.1.0/ruby/defines.h
/usr/include/ruby-2.1.0/ruby/digest.h
/usr/include/ruby-2.1.0/ruby/dl.h
/usr/include/ruby-2.1.0/ruby/encoding.h
/usr/include/ruby-2.1.0/ruby/intern.h
/usr/include/ruby-2.1.0/ruby/io.h
/usr/include/ruby-2.1.0/ruby/missing.h
/usr/include/ruby-2.1.0/ruby/oniguruma.h
/usr/include/ruby-2.1.0/ruby/re.h
/usr/include/ruby-2.1.0/ruby/regex.h
/usr/include/ruby-2.1.0/ruby/ruby.h
/usr/include/ruby-2.1.0/ruby/st.h
/usr/include/ruby-2.1.0/ruby/subst.h
/usr/include/ruby-2.1.0/ruby/thread.h
/usr/include/ruby-2.1.0/ruby/util.h
/usr/include/ruby-2.1.0/ruby/version.h
/usr/include/ruby-2.1.0/ruby/vm.h
There is 2 files more in these RPM.