stderr ignition-fuel_tools6 while building

[ggiulian]

Environment

• OS Version: Ubuntu 20.04

• Source or binary build?
  source: ROS2 Galactic and Ignition Edifice

  When building there is this stderr referred to developers and authors of ignition fuel tools

# paste log here
```stderr: ignition-fuel_tools6             
CMake Warning (dev) at /home/ggiuliano/edifice_ws/install/share/cmake/ignition-cmake2/cmake2/IgnUtils.cmake:385 (message):
   -- THIS MESSAGE IS INTENDED FOR IGNITION-FUEL_TOOLS AUTHORS --
      (IF YOU SEE THIS, PLEASE REPORT IT)

  Could not find pkg-config information for YAML.  It was not provided by the
  find-module for the package, nor was it explicitly passed into the call to
  ign_find_package(~).  This is most likely an error in this project's use of
  ign-cmake.
Call Stack (most recent call first):
  CMakeLists.txt:42 (ign_find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

---
Finished <<< ignition-fuel_tools6 [6min 10s]

[chapulina]

Do you have libyaml installed? What version is it?

[ggiulian]

Yes, the version is the newest: 0.2.2-1

[chapulina]

Interesting, I have the same version and it works for me, and it also works on CI.

We'll need more information about what steps you took to get to this problem.

[ggiulian]

Mainly, I followed this documentation: https://ignitionrobotics.org/docs/edifice/install_ubuntu_src.
leaving out the installations of generic tools, vcs and colcon from pip or apt (because already installed) and git. So I created the workspace on the home, after that I followed the instructions of the documentation. I have left out the installation of gcc and g ++, since I work on Focal. Eventually I built everything with colcon build --merge-install

[ggiulian]

I tried with different build like colcon build --cmake-args -DBUILD_TESTING=OFF --merge-install and colcon build --packages-select PACKAGE_NAME but i had the same stderr

[bperseghetti]

@azeey @j-rivero appears this might still be a lingering issue:

--- stderr: gz-fuel_tools9                                                                                                                                                  
CMake Warning (dev) at /home/user/git/harmonic/install/share/cmake/gz-cmake3/cmake3/GzFindPackage.cmake:456 (message):
   -- THIS MESSAGE IS INTENDED FOR GZ-FUEL_TOOLS AUTHORS --
      (IF YOU SEE THIS, PLEASE REPORT IT)

  Could not find pkg-config information for YAML.  It was not provided by the
  find-module for the package, nor was it explicitly passed into the call to
  gz_find_package(~).  This is most likely an error in this project's use of
  gz-cmake.
Call Stack (most recent call first):
  CMakeLists.txt:44 (gz_find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

---
Finished <<< gz-fuel_tools9 [26.1s]

[azeey]

I was able to reproduce this if I source a ROS humble installation with ros-humble-libyaml-vendor installed. I suspect this is fixed in Jazzy since the libyaml_vendor package has been updated to use ament_cmake_vendor_package.