catkin build fails (ruby issue on utilrb)

[ntorresalberto]

Setup

I'm on Fedora 32.
I believe there aren't any packages available for the distro (particularly in the copr https://copr.fedorainfracloud.org/coprs/thofmann/ros/).
I know this is not specified in the docs but I'm trying to build the toolchain (orocos-toolchain/orocos_toolchain branch toolchain-2.9) in a clean catkin workspace.

Error log

The catkin error is:

CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:164 (message):
  Could NOT find Ruby (missing: RUBY_INCLUDE_DIR RUBY_LIBRARY) (found version
  "1.8.0")
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:445 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake/Modules/FindRuby.cmake:276 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:5 (find_package)

Previous issue

@meyerj @mjbogusz
I couldn't comment on #29 but I think it's possibly the same issue.

#13 was replaced by a new installation method based on pure CMake in #34, which does not depend on catkin. Please check the new top-level README.md for further details.

Are there any workarounds to make it work?

Some new info

I saw someone suggest installing the gems rake and hoe would solve the issue so I manually installed the dnf packages rubygem-rake and rubygem-hoe and then the error turns into:

CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:164 (message):
  Could NOT find Ruby (missing: RUBY_INCLUDE_DIR RUBY_LIBRARY
  RUBY_CONFIG_INCLUDE_DIR) (found version "2.7.2")
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:445 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake/Modules/FindRuby.cmake:276 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:5 (find_package)

Which at least corresponds to my ruby version:

→ ruby --version
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]

[ntorresalberto]

Turns out I needed to install the development package: sudo dnf install ruby-devel (on Fedora).
The equivalent in ubuntu would be sudo apt install ruby-dev.
I'm leaving this info here for future googlers.

source