Can't install charlock holmes gem, libicu-devel installed - ruby

Question

I am trying to install charlock holmes, nevertheless, I keep getting an error:
[root#hugovm gitlab]# gem install charlock_holmes --version '0.6.9.4'
Building native extensions. This could take a while...
ERROR: Error installing charlock_holmes:
ERROR: Failed to build gem native extension.
/usr/bin/ruby extconf.rb
checking for main() in -licui18n... yes
checking for main() in -licui18n... yes
checking for unicode/ucnv.h... yes
-- tar zxvf file-5.08.tar.gz
-- ./configure --prefix=/usr/local/share/gems/gems/charlock_holmes-0.6.9.4/ext/charlock_holmes/dst/ --disable-shared --enable-static --with-pic
-- patch -p0 < ../file-soft-check.patch
*** 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}/lib64
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/ruby
--with-icu-dir
--without-icu-dir
--with-icu-include
--without-icu-include=${icu-dir}/include
--with-icu-lib
--without-icu-lib=${icu-dir}/
--with-icui18nlib
--without-icui18nlib
--with-icui18nlib
--without-icui18nlib
extconf.rb:7:in `sys': patch -p0 < ../file-soft-check.patch failed, please report issue on http://github.com/brianmario/charlock_holmes (RuntimeError)
from extconf.rb:61:in `block (2 levels) in <main>'
from extconf.rb:59:in `chdir'
from extconf.rb:59:in `block in <main>'
from extconf.rb:55:in `chdir'
from extconf.rb:55:in `<main>'
Gem files will remain installed in /usr/local/share/gems/gems/charlock_holmes-0.6.9.4 for inspection.
Results logged to /usr/local/share/gems/gems/charlock_holmes-0.6.9.4/ext/charlock_holmes/gem_make.out
I already installed libicu-devel.
Thanks

Answer 1

I had the exact same issue today. Tried to install gitlab on a clean fedora machine.
For me, a line in /usr/local/share/gems/gems/charlock_holmes-0.6.9.4/ext/charlock_holmes/gem_make.out pointed to mkmf.log, which is in the same directory as above log file.
There it said "patch: command not found"
sudo yum install patch

Answer 2

In you output I can read:
extconf.rb:7:in `sys': patch -p0 < ../file-soft-check.patch failed, please report issue on http://github.com/brianmario/charlock_holmes (RuntimeError)
So it all points to a bug. I suppose it is a good idea follow the output and created an issue there, explaining what you are trying to do and giving details of your environment.

Answer 3

ruby-devel is missing
yum install ruby-devel
and you'll be set :)