issue with running CMake (maybe ADD_REQUIRED_DEPENDENCY macro)

[Alberto Parmiggiani]

Hi,
I've been trying to compile gepetto-viewer on a Ubuntu distribution.
When I run cmake, however, I get the following error message.

-- openscenegraph >= 3.2 is required.
-- Checking for module 'openscenegraph >= 3.2'
--
CMake Error at /usr/share/cmake-3.5/Modules/FindPkgConfig.cmake:367 (message):
  A required package was not found
Call Stack (most recent call first):
  /usr/share/cmake-3.5/Modules/FindPkgConfig.cmake:532 (_pkg_check_modules_internal)
  cmake/pkg-config.cmake:288 (PKG_CHECK_MODULES)
  cmake/pkg-config.cmake:459 (ADD_DEPENDENCY)
  CMakeLists.txt:75 (ADD_REQUIRED_DEPENDENCY)

The issue seems to be related to the ADD_REQUIRED_DEPENDENCY macro in cmake/pkg-config.cmake failing to find openscenegraph.
openscenegraph is installed in /usr/local/lib64/; I tried both compiling and installing with apt-get install and it does not seem to make a difference.
I'm not used to the macro system being used for adding libraries to this project.
Any suggestion on how to fix/troubleshoot the issue?

[Joseph Mirabel]

/usr/local/lib64/pkgconfig must be in the PKG_CONFIG_PATH environment variable.

[Alberto Parmiggiani]

That solved my issue; thank you.

Just for the record, when making the project I was getting error: ‘to_string’ is not a member of ‘std’ errors, which I managed to solve by switching from gcc5 to gcc6.