Hello,

Using Ubuntu 18.04 & melodic, using Qt Creator 4.8.0-rc1 (4.7.84), and Qt5.12.0.

The general idea is that I have reinstalled fully my PC, and want to keep on working on a project started under kinetic.

catkin_make from the terminal works without issues, and my package compiles fine and runs without issue once built. However I am trying to setup qt creator and the project does not parse. It fails to find my packages in /opt/ros/melodic .

Error message in the Issues section goes as follow :

/opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83: error: Could not find a package configuration file provided by "qt_gui_cpp" with any of the following names: qt_gui_cppConfig.cmake qt_gui_cpp-config.cmake Add the installation prefix of "qt_gui_cpp" to CMAKE_PREFIX_PATH or set "qt_gui_cpp_DIR" to a directory containing one of the above files.  If "qt_gui_cpp" provides a separate development package or SDK, be sure it has been installed. CMakeLists.txt:13 (find_package)

The qtguicpp package is not entirely relvant, as it does that for all the packages mentioned in the CMakelists.txt. (and they are all here)

The environment variable CMAKEPREFIXPATH is setup to my /opt/ros/melodic , so the following answer is not working: link text

Also qt creator is started from the terminal so no issue with sourcing.

I tried to resolve manually every package DIR in Project -> Build settings -> Environment variables , but it is tedious and I hit a couple of wall when I go down this path. It used to be pretty seamless.

In the General Message section I get :

Starting to parse CMake project, using: "-DCMAKE_BUILD_TYPE:STRING=Debug", "-DCMAKE_CXX_COMPILER:STRING=/usr/bin/g++", "-DCMAKE_C_COMPILER:STRING=/usr/bin/gcc", "-DCMAKE_INSTALL_PREFIX:PATH=/home/pilou/catkin_ws/install", "-DCMAKE_PREFIX_PATH:STRING=/home/pilou/catkin_ws/devel:/opt/ros/melodic", "-DQT_QMAKE_EXECUTABLE:STRING=/home/pilou/Qt/5.12.0/gcc_64/bin/qmake".
Using CATKIN_DEVEL_PREFIX: /home/pilou/catkin_ws/build/devel
Using CMAKE_PREFIX_PATH: /home/pilou/catkin_ws/devel:/opt/ros/melodic
Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.15", minimum required is "2") 
Using PYTHON_EXECUTABLE: /usr/bin/python2
Using Debian Python package layout
Using empy: /usr/bin/empy
Using CATKIN_ENABLE_TESTING: ON
Call enable_testing()
Using CATKIN_TEST_RESULTS_DIR: /home/pilou/catkin_ws/build/test_results
Found gmock sources under '/usr/src/googletest': gmock will be built
Found PythonInterp: /usr/bin/python2 (found version "2.7.15") 
Found gtest sources under '/usr/src/googletest': gtests will be built
Using Python nosetests: /usr/bin/nosetests-2.7
catkin 0.7.14
Could NOT find qt_gui_cpp (missing: qt_gui_cpp_DIR)
Could not find the required component 'qt_gui_cpp'. The following CMake error indicates that you either need to install the package with the same name or change your environment so that it can be found.
CMake Error at /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by "qt_gui_cpp" with
  any of the following names:

    qt_gui_cppConfig.cmake
    qt_gui_cpp-config.cmake

  Add the installation prefix of "qt_gui_cpp" to CMAKE_PREFIX_PATH or set
  "qt_gui_cpp_DIR" to a directory containing one of the above files.  If
  "qt_gui_cpp" provides a separate development package or SDK, be sure it has
  been installed.
Call Stack (most recent call first):
  CMakeLists.txt:13 (find_package)


Configuring incomplete, errors occurred!
See also "/home/pilou/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/pilou/catkin_ws/build/CMakeFiles/CMakeError.log".
CMake Project parsing failed. 

Running out of ideas on how to setup qtcreator-ros ... Any suggestion please ?