root@trevor-pc trevor]# pacman -S linux-rt-manjaro-headers
resolving dependencies...
looking for conflicting packages...

Packages (1) linux-rt-manjaro-headers-4.9.27_rt18-1

Total Download Size:    7.49 MiB
Total Installed Size:  50.74 MiB

:: Proceed with installation? [Y/n] Y
:: Retrieving packages...
 linux-rt-manjaro-headers-4.9.27_rt18-1-x86_64    7.5 MiB  1353K/s 00:06 [########################################] 100%
(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%
(1/1) checking available disk space                                      [########################################] 100%
:: Processing package changes...
(1/1) installing linux-rt-manjaro-headers                                [########################################] 100%
:: Running post-transaction hooks...
(1/2) Install DKMS modules
==> No kernel 4.9.27-1-rt18-MANJARO modules. You must install them to use DKMS!
(2/2) Arming ConditionNeedsUpdate...