diff --git a/doc/misc/efaq-w32.texi b/doc/misc/efaq-w32.texi
index 5c24364286d..74e12485eec 100644
--- a/doc/misc/efaq-w32.texi
+++ b/doc/misc/efaq-w32.texi
@@ -196,7 +196,7 @@ in the Emacs source distribution.
 If you need to build or run Emacs on MS Windows before Windows 7, you
 have to use the MinGW port of GCC and the MSYS suite of tools.  The
 file @file{nt/INSTALL} in Emacs source distribution contains the
-details.
+details.  @xref{MinGW}.
 
 Support for displaying images, as well as XML/HTML rendering and TLS
 networking requires external libraries, the headers and import
@@ -2245,21 +2245,27 @@ software.  This includes all the optional libraries used by Emacs
 Hunspell, Gawk, GNU Make, Groff, GDB.
 
 @node MinGW
-@section MinGW and MSYS
+@section mingw.org's MinGW and MSYS
 @cindex mingw tools
 @cindex msys environment
 @cindex subprocesses, mingw and msys
 
 @uref{https://osdn.net/projects/mingw/}
 
-MinGW is another set of development tools that produce native Windows
-executables, not dependent on Cygwin's POSIX emulation DLLs.
+MinGW from @code{mingw.org} is another set of development tools that
+produce native Windows executables, not dependent on Cygwin's POSIX
+emulation DLLs.  This is the original MinGW project, nowadays no longer
+actively developed.  Its files can currently be found only via the WWW
+archive site known as the @dfn{Wayback Machine}.  The latest MinGW
+release files can be found here:
+@uref{https://web.archive.org/web/20210410172202/https://osdn.net/projects/mingw/releases/}.
 
-MSYS is a POSIX shell and minimal set of tools that are commonly used in
-configure scripts.  Like Cygwin, this environment uses a non-native
-filesystem mapping to appear more POSIX like to the scripts that it
-runs.  This is intended to complement the MinGW tools to make it easier
-to port software to Windows.
+MSYS, which is part of @code{mingw.org}s MinGW, is a POSIX shell and
+minimal set of tools that are commonly used in configure scripts.  Like
+Cygwin, this environment uses a non-native filesystem mapping to appear
+more POSIX like to the scripts that it runs.  This is intended to
+complement the MinGW tools to make it easier to port software to
+Windows.
 
 @node GnuWin32
 @section GnuWin32
diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index be023b3d5ce..ff9c0105cb3 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -1304,7 +1304,7 @@ Emacs will select some other font instead.
 The only workaround is not to choose such font variants as the default
 font when running Emacs on MS-Windows.
 
-** On OpenBSD, color Emoji are not supported by default.
+** On OpenBSD before version 7.8, color Emoji are not supported by default.
 
 The system's FreeType library is not built with libpng support, so it
 can't display color emoji.  This is due to the fact that, on OpenBSD,
@@ -1324,6 +1324,7 @@ following those steps:
 	5. Build and install Xenocara (also, see release(8)).
 
 Note that this support will be gone after each OpenBSD's system upgrade.
+Also note that upgrading to OpenBSD 7.8 solves this whole issue.
 
 * Internationalization problems
 
diff --git a/nt/INSTALL b/nt/INSTALL
index a99e60839e9..f5356f698e0 100644
--- a/nt/INSTALL
+++ b/nt/INSTALL
@@ -141,9 +141,9 @@ build should run on Windows 9X and newer systems).
 
   A nice installer, called mingw-get, is available for those who don't
   like to mess with manual installations.  You can download it from
-  here:
+  the "Wayback Machine", here:
 
-    https://osdn.net/projects/mingw/releases
+    https://web.archive.org/web/20210410172202/https://osdn.net/projects/mingw/releases/
 
   (This installer only supports packages downloaded from the MinGW
   site; for the rest you will still need the manual method.)
@@ -205,9 +205,9 @@ build should run on Windows 9X and newer systems).
 
   You will need to install the MinGW port of GCC and Binutils, and the
   MinGW runtime and Windows API distributions, to compile Emacs.  You
-  can find these on the MinGW download/Base page:
+  can find these on the MinGW download page:
 
-    https://osdn.net/projects/mingw/releases
+    https://web.archive.org/web/20210410172202/https://osdn.net/projects/mingw/releases/
 
   In general, install the latest stable versions of the following
   MinGW packages from that page: gcc, binutils, mingw-rt, w32api.  You