cannot find source code for runtime library file 'object.d'

[denis via Digitalmars-d-learn]

```
$ zypper install dmd
$ dmd main.d
Error: cannot find source code for runtime library file 'object.d'
       dmd might not be correctly installed. Run 'dmd -man' for 
installation instructions.
       config file: /etc/dmd.conf
$ cat /etc/dmd.conf
;
; dmd.conf file for dmd
;
; dmd will look for dmd.conf in the following sequence of 
directories:
;   - current working directory
;   - directory specified by the HOME environment variable
;   - directory dmd resides in
;   - /etc directory
;
; Names enclosed by %% are searched for in the existing 
environment and inserted
;
; The special name %@P% is replaced with the path to this file
;

[Environment32]
DFLAGS=-I/usr/include/dlang/dmd -L-L/usr/lib -L--export-dynamic 
-fPIC

[Environment64]
DFLAGS=-I/usr/include/dlang/dmd -L-L/usr/lib64 -L--export-dynamic 
-fPIC

$ ls /usr/include/dlang/dmd
<empty>

$ cat /etc/os-release
NAME="openSUSE Tumbleweed"
VERSION="20231006"

$ dmd --version
DMD64 D Compiler v2.105.3
```

Help?