Public bug reported:

1. At refreshing patches after merged upstream Release_20240624, 
"EXTERNAL_BUILD" variable has been removed as it's meaningless while we're 
always building external dkms package. Yet later in upstream commit 
22b792ff38ac ("ARL platform PV release candidate on 2024-09-27"), 
"EXTERNAL_BUILD" was referenced again. This causes following error:
```
make[5]: *** No rule to make target 
'/var/lib/dkms/ipu6-drivers/0~git202506270118.9bff7368/build/drivers/media/pci/intel/ipu6/psys/ipu-psys.o',
 needed by 
'/var/lib/dkms/ipu6-drivers/0~git202506270118.9bff7368/build/drivers/media/pci/intel/ipu6/psys/intel-ipu6-psys.o'.
  Stop.
```

2. At refreshing patches after merged upstream 20241122, which introduced 
in-tree IPU6-ISYS migration, a cflag for adding $(src)/psys as inclusion path 
in drivers/media/pci/intel/ipu6/Makefile was accidentally removed. This causes 
following error:
```
/var/lib/dkms/ipu6-drivers/0~git202506270118.9bff7368/build/drivers/media/pci/intel/ipu6/ipu6.c:13:10:
 fatal error: ipu-psys.h: No such file or directory
   13 | #include "ipu-psys.h"
      |          ^~~~~~~~~~~~
compilation terminated.
```

** Affects: ipu6-drivers (Ubuntu)
     Importance: Low
     Assignee: You-Sheng Yang (vicamo)
         Status: In Progress

** Affects: ipu6-drivers (Ubuntu Jammy)
     Importance: Undecided
         Status: Invalid

** Affects: ipu6-drivers (Ubuntu Noble)
     Importance: Undecided
         Status: Invalid

** Affects: ipu6-drivers (Ubuntu Plucky)
     Importance: Undecided
         Status: Won't Fix

** Affects: ipu6-drivers (Ubuntu Questing)
     Importance: Undecided
         Status: Confirmed

** Affects: ipu6-drivers (Ubuntu Resolute)
     Importance: Low
     Assignee: You-Sheng Yang (vicamo)
         Status: In Progress

** Attachment added: "make_6.8.0-87-generic.log"
   
https://bugs.launchpad.net/bugs/2134800/+attachment/5932864/+files/make_6.8.0-87-generic.log

** Also affects: ipu6-drivers (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: ipu6-drivers (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Also affects: ipu6-drivers (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Also affects: ipu6-drivers (Ubuntu Resolute)
   Importance: Undecided
       Status: New

** Also affects: ipu6-drivers (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: ipu6-drivers (Ubuntu Jammy)
       Status: New => Invalid

** Changed in: ipu6-drivers (Ubuntu Noble)
       Status: New => Invalid

** Changed in: ipu6-drivers (Ubuntu Plucky)
       Status: New => Won't Fix

** Changed in: ipu6-drivers (Ubuntu Questing)
       Status: New => Confirmed

** Changed in: ipu6-drivers (Ubuntu Resolute)
       Status: New => In Progress

** Changed in: ipu6-drivers (Ubuntu Resolute)
   Importance: Undecided => Low

** Changed in: ipu6-drivers (Ubuntu Resolute)
     Assignee: (unassigned) => You-Sheng Yang (vicamo)

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https://bugs.launchpad.net/bugs/2134800

Title:
  failed to build against linux kernel < v6.10

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