Arch Linux

Description:

The package community/nlohmann-json 3.9.1-1 already provided file /usr/include/nlohmann/json.hpp, causes root 6.24.00-1 install or upgrade from 6.22.00-1 failed. Maybe the file in root should be removed while packaging.

Additional info:
* package version(s)
[root] 6.24.00-1
[nlohmann-json] 3.9.1-1
* config and/or log files etc.
```
$ LANG=C yay
:: Synchronizing package databases...
core is up to date
extra is up to date
community is up to date
multilib is up to date
liquorix is up to date
repo-ck is up to date
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...

Package (1) Old Version New Version Net Change

community/root 6.22.08-1 6.24.00-1 48.77 MiB

Total Installed Size: 419.00 MiB
Net Upgrade Size: 48.77 MiB

:: Proceed with installation? [Y/n]
(1/1) checking keys in keyring [#############################################################################] 100%
(1/1) checking package integrity [#############################################################################] 100%
(1/1) loading package files [#############################################################################] 100%
(1/1) checking for file conflicts [#############################################################################] 100%
error: failed to commit transaction (conflicting files)
root: /usr/include/nlohmann/json.hpp exists in filesystem (owned by nlohmann-json)
Errors occurred, no packages were upgraded.
error installing repo packages
```

Steps to reproduce:

1. Remove root 6.24.00-1 if it has been installed before.
2. install nlohmann-json.
3. install root 6.24.00-1 or upgrade root to 6.24.00-1. Pacman will complain about confiction.