app-text/ronn is impossible to compile under gentoo

[vandr0iy]

Hi!
I'm unable to compile app-text/ronn, here's what emerge -DuNav says after it finishes:

• Messages for package app-text/ronn-0.7.3-r3:
• ERROR: app-text/ronn-0.7.3-r3::gentoo failed (compile phase):
• (no error message)
  *
• Call stack:
• ebuild.sh, line 133: Called src_compile
• environment, line 4486: Called ruby-ng_src_compile
• environment, line 4177: Called _ruby_invoke_environment 'all' 'all_ruby_compile'
• environment, line 679: Called all_ruby_compile
• environment, line 763: Called die
• The specific snippet of code:
• PATH="${S}/bin:${PATH}" rake man || die
  *
• If you need support, post the output of emerge --info '=app-text/ronn-0.7.3-r3::gentoo',
• the complete build log and the output of emerge -pqv '=app-text/ronn-0.7.3-r3::gentoo'.
• The complete build log is located at '/var/tmp/portage/app-text/ronn-0.7.3-r3/temp/build.log'.
• The ebuild environment file is located at '/var/tmp/portage/app-text/ronn-0.7.3-r3/temp/environment'.
• Working directory: '/var/tmp/portage/app-text/ronn-0.7.3-r3/work/all/ronn-0.7.3'
• S: '/var/tmp/portage/app-text/ronn-0.7.3-r3/work/all/ronn-0.7.3'

eix -e ronn:

[I] app-text/ronn
Available versions: 0.7.3-r2 0.7.3-r3 {test ELIBC="FreeBSD" RUBY_TARGETS="ruby20 ruby21 ruby22 ruby23"}
Installed versions: 0.7.3-r3(11:23:24 PM 11/02/2015)(-test ELIBC="-FreeBSD" RUBY_TARGETS="ruby20 ruby21 -ruby19 -ruby22")
Homepage: https://github.com/rtomayko/ronn/
Description: Converts simple, human readable textfiles to roff for terminal display, and HTML

This is going on for a couple of months already... Does anyone know a possible reason?