<== Finished processing package [37 of 163]: 'rosgraph'
==> Processing catkin package: 'roslib'
==> Building with env: '/opt/ros/melodic/env.sh'
==> cmake /home/pi/ros_catkin_ws/src/ros/roslib -DCATKIN_DEVEL_PREFIX=/home/pi/ros_catkin_ws/devel_isolated/roslib -DCMAKE_INSTALL_PREFIX=/opt/ros/melodic -DCMAKE_BUILD_TYPE=Release -G Unix Makefiles in '/home/pi/ros_catkin_ws/build_isolated/roslib'
-- Using CATKIN_DEVEL_PREFIX: /home/pi/ros_catkin_ws/devel_isolated/roslib
-- Using CMAKE_PREFIX_PATH: /opt/ros/melodic
-- This workspace overlays: /opt/ros/melodic
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.16", 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/pi/ros_catkin_ws/build_isolated/roslib/test_results
-- Forcing gtest/gmock from source, though one was otherwise available.
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
-- Found PythonInterp: /usr/bin/python2 (found version "2.7.16")
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.7.29
-- BUILD_SHARED_LIBS is on
-- Could NOT find rospack (missing: rospack_DIR)
-- Could not find the required component 'rospack'. 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 "rospack" with any
of the following names:
rospackConfig.cmake
rospack-config.cmake
Add the installation prefix of "rospack" to CMAKE_PREFIX_PATH or set
"rospack_DIR" to a directory containing one of the above files. If
"rospack" provides a separate development package or SDK, be sure it has
been installed.
Call Stack (most recent call first):
CMakeLists.txt:3 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/pi/ros_catkin_ws/build_isolated/roslib/CMakeFiles/CMakeOutput.log".
See also "/home/pi/ros_catkin_ws/build_isolated/roslib/CMakeFiles/CMakeError.log".
<== Failed to process package 'roslib':
Command '['/opt/ros/melodic/env.sh', 'cmake', '/home/pi/ros_catkin_ws/src/ros/roslib', '-DCATKIN_DEVEL_PREFIX=/home/pi/ros_catkin_ws/devel_isolated/roslib', '-DCMAKE_INSTALL_PREFIX=/opt/ros/melodic', '-DCMAKE_BUILD_TYPE=Release', '-G', 'Unix Makefiles']' returned non-zero exit status 1
Reproduce this error by running:
==> cd /home/pi/ros_catkin_ws/build_isolated/roslib && /opt/ros/melodic/env.sh cmake /home/pi/ros_catkin_ws/src/ros/roslib -DCATKIN_DEVEL_PREFIX=/home/pi/ros_catkin_ws/devel_isolated/roslib -DCMAKE_INSTALL_PREFIX=/opt/ros/melodic -DCMAKE_BUILD_TYPE=Release -G 'Unix Makefiles'
Command failed, exiting.
以上故障是什么原因导致的，怎么解决？
