Ruby Issues with Ubuntu 18.04

[lnnx2006]

Errors << metaruby:cmake /home/fei/isir/orocos-2.9_ws/logs/metaruby/build.cmake.000.log
CMake Error at /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find Ruby (missing: RUBY_INCLUDE_DIR RUBY_LIBRARY) (found version
"1.8.0")

When catkin build with Ubuntu 18.04, the above problems will be encounted. Could anybody update the packages ?

[mjbogusz]

I've encountered that too while building orocos_toolchain in a catkin workspace, specifically when building orogen.
My workaround (but not a solution) was to manually call cmake:

cd [ws]/build/orogen
cmake ../../src/orocos/orocos_toolchain/orogen
cd ../..
catkin build [args]

[keivanzavari]

Hi

doing the gem install rake hoe solves the issue here... It's just that I have to open a new terminal which sources bashrc which contains setup.bash of ros and my catkin_ws

cmake version 3.10.2
gcc 7.3.0
ubuntu 18.04.1

[mjbogusz]

I've traced the issue back to its origin and filed a more precise bug report here: orocos-toolchain/utilrb#41.
Basically RUBYOPT=-rubygems is not anymore valid for Ruby >= 2.5 and it's best to remove it altogether.

If there's no PR by Monday I'll create my own - one for utilrb, and one for orocos_toolchain fixing the flag and updating the utilrb git submodule.

[mjbogusz]

utilrb PR: orocos-toolchain/utilrb#42
orocos_toolchain PR that apparently fixes this flag too: #13

[kaixqu]

Did you succeed in installing orogen? I just cannot find out how. Could you please help me? Thanks a lot. :-)

[meyerj]

The RUBYOPT bug was fixed in orocos-toolchain/utilrb#42.

#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.