Having trouble with your macos to upgrade or install CMake 4.*
or latest and got stuck since you have Cmake 3.15 or order installed?
Error similar too,
==> Installing Cask cmake
==> Moving App 'CMake.app' to '/Applications/CMake.app'
==> Backing App 'CMake.app' up to '/usr/local/Caskroom/cmake/4.0.2/CMake.app'
==> Removing App '/Applications/CMake.app'
==> Purging files for version 4.0.2 of Cask cmake
Error: It seems there is already a Binary at '/usr/local/bin/cpack'
Well if that is the case then i got you.
Check these steps:
A. rename the linked files in your `/usr/local/bin`
$ ls -ltha /usr/local/bin/ | grep cmake
lrwxr-xr-x 1 you admin 32B Aug 18 2019 ctest@ -> ../Cellar/cmake/3.15.2/bin/ctest
lrwxr-xr-x 1 you admin 32B Aug 18 2019 cpack@ -> ../Cellar/cmake/3.15.2/bin/cpack
lrwxr-xr-x 1 you admin 32B Aug 18 2019 cmake@ -> ../Cellar/cmake/3.15.2/bin/cmake
lrwxr-xr-x 1 you admin 33B Aug 18 2019 ccmake@ -> ../Cellar/cmake/3.15.2/bin/ccmake
//
// simply rename with these commands
//
$ cd /usr/local/bin/
$ ls -ltha | grep cmake| awk '{print $9}' | sed 's/@//' | | xargs -i{} mv {} bak-{}
//
// verify files looks like these
//
$ ls -ltha | grep cmake
lrwxr-xr-x 1 you admin 32B Aug 18 2019 bak-ctest@ -> ../Cellar/cmake/3.15.2/bin/ctest
lrwxr-xr-x 1 you admin 32B Aug 18 2019 bak-cpack@ -> ../Cellar/cmake/3.15.2/bin/cpack
lrwxr-xr-x 1 you admin 32B Aug 18 2019 bak-cmake@ -> ../Cellar/cmake/3.15.2/bin/cmake
lrwxr-xr-x 1 you admin 33B Aug 18 2019 bak-ccmake@ -> ../Cellar/cmake/3.15.2/bin/ccmake
B. rename the linked manpage7 `/usr/local/share/man/man7`
$ cd /usr/local/share/man/man7
$ ls -ltha | grep cmake
lrwxr-xr-x 1 you admin 62B Jun 8 23:35 cpack@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cpack-generators.7
lrwxr-xr-x 1 you admin 61B Jun 8 23:35 cmake-variables.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-variables.7
lrwxr-xr-x 1 you admin 62B Jun 8 23:35 cmake-toolchains.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-toolchains.7
lrwxr-xr-x 1 you admin 58B Jun 8 23:35 cmake-server.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-server.7
lrwxr-xr-x 1 you admin 54B Jun 8 23:35 cmake-qt.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-qt.7
... // stil many but they were in the same pattern
//
// simply rename with these commands
//
$ ls -ltha | grep cmake| awk '{print $9}' | sed 's/@//' | | xargs -i{} mv {} bak-{}
//
// verify files looks like these
//
$ ls -ltha | grep cmake
lrwxr-xr-x 1 you admin 62B Jun 8 23:35 bak-cpack@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cpack-generators.7
lrwxr-xr-x 1 you admin 61B Jun 8 23:35 bak-cmake-variables.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-variables.7
lrwxr-xr-x 1 you admin 62B Jun 8 23:35 bak-cmake-toolchains.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-toolchains.7
lrwxr-xr-x 1 you admin 58B Jun 8 23:35 bak-cmake-server.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-server.7
lrwxr-xr-x 1 you admin 54B Jun 8 23:35 bak-cmake-qt.7@ -> ../../../Cellar/cmake/3.15.2/share/man/man7/cmake-qt.7
...
C. rename the linked manpage1 `/usr/local/share/man/man1`
$ ls -ltha /usr/local/share/man/man1/ | grep cmake
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 ctest.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/ctest.1
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 cpack.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/cpack.1
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 cmake.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/cmake.1
lrwxr-xr-x 1 you admin 52B Jun 8 23:35 ccmake.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/ccmake.1
//
// simply rename with these commands
//
$ cd /usr/local/share/man/man7
$ ls -ltha | grep cmake| awk '{print $9}' | sed 's/@//' | | xargs -i{} mv {} bak-{}
//
// verify files looks like these
//
$ ls -ltha | grep cmake
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 bak-cmake.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/cmake.1
lrwxr-xr-x 1 you admin 52B Jun 8 23:35 bak-ccmake.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/ccmake.1
//
// IMPORTANT!
// ctest and cpack somehow out of our pattern then do it manually
//
$ ls -ltha | grep ctest | awk '{print $9}' | sed 's/@//' | | xargs -i{} mv {} bak-{}
$ ls -ltha | grep cpack | awk '{print $9}' | sed 's/@//' | | xargs -i{} mv {} bak-{}
$ ls -ltha | grep cmake
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 bak-cmake.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/cmake.1
lrwxr-xr-x 1 you admin 52B Jun 8 23:35 bak-ccmake.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/ccmake.1
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 bak-ctest.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/ctest.1
lrwxr-xr-x 1 you admin 51B Jun 8 23:35 bak-cpack.1@ -> ../../../Cellar/cmake/3.15.2/share/man/man1/cpack.1
Re-run your `$ brew install --cask cmake` shud works.
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