This is where package managers such as yum or dnf add their value
It's telling you that tmux has other dependencies.
Look in the directory you're in for those
ls *curses*
If not there look where you found/downloaded tmux, most likely the dependencies will be there (maybe not literally in the same directory)
When you have those two rpms in the same directory as tmux, then specify all 3 on the rpm command line together
Rpm will then know which ones to use