TZUTC: -0800
MSGID: 59184.sync_sys@1:103/705 2dd01aea
PID: Synchronet 3.21b-Linux master/177a369d2 Jan 04 2026 GCC 12.2.0
TID: SBBSecho 3.34-Linux master/bf8981149 Jan 15 2026 GCC 12.2.0
BBSID: VERT
CHRS: ASCII 1
FORMAT: flowed
open https://gitlab.synchro.net/main/sbbs/-/issues/1053

I think some GNU make special assignment with $(shell realpath ...) would help
here, but didn't figure it out yet and didn't want to fuggetabadit.

e.g.
```
$ make -f ~/sbbs/install/install-sbbs.mk SBBSDIR=../test2 run
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
make: ../test2/repo: No such file or directory
cp -r /ctrl ../test2
cp: cannot stat '/ctrl': No such file or directory
make: *** [/home/rswindell/sbbs/install/install-sbbs.mk:264: ../test2/ctrl]
Error 1
```

and when REPODIR is relative, you end up with something like this:

```
make -C /home/rswindell/test2/exec MAKEFLAGS= os=linux RELEASE=1
BAJAPATH=../repo2/src/sbbs3/gcc.linux.x64.exe.release/baja
make[1]: Entering directory '/home/rswindell/test2/exec'
make[1]: *** No rule to make target 'ftp.bin', needed by 'all'.  Stop.
```
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