This documents that GDC 9.4 or later is required to build the D
language rather than GDC 9.1 which suffers from PR94240.
PR d/104749
* doc/install.texi (GDC): Document GDC 9.4 or later is required
to build the D language frontend.
@item @anchor{GDC-prerequisite}GDC
In order to build GDC, the D compiler, you need a working GDC
-compiler (GCC version 9.1 or later) and D runtime library,
+compiler (GCC version 9.4 or later) and D runtime library,
@samp{libphobos}, as the D front end is written in D.
Versions of GDC prior to 12 can be built with an ISO C++11 compiler, which can