GDC buildable on solaris?

[kdevel]

On Sunday, 13 March 2022 at 11:09:56 UTC, Iain Buclaw wrote:
> [...]
> 2. Current mainline gdc requires a D compiler, so the minimum 
> version to bootstrap is 9.1 - though preferably you should have 
> at least 9.4 or 10.1 because of [belated 
> bugs](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104749) that 
> were discovered too late on some platforms when verifying their 
> ability to bootstrap themselves.
> [...]

Is it correct that "current mainline" implies GCC-12? Few days 
ago I bootstrapped GCC/GDC 11.2 without having a gdc installed. 
configure of GCC 12 now says:

     configure: error: GDC is required to build d