diff --git a/build-scripts/update-copyright.sh b/build-scripts/update-copyright.sh
index 5955b09fa..ea1f79875 100755
--- a/build-scripts/update-copyright.sh
+++ b/build-scripts/update-copyright.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 find . -type f -exec grep -Il "Copyright" {} \;     \
-| grep -v \.hg                             \
+| grep -v \.git                             \
 | while read file;                            \
 do \
   LC_ALL=C sed -b -i "s/\(.*Copyright.*\)[0-9]\{4\}\( *Sam Lantinga\)/\1`date +%Y`\2/" "$file"; \
diff --git a/configure b/configure
index 8b1c1c26d..0b3079cf3 100755
--- a/configure
+++ b/configure
@@ -16000,9 +16000,9 @@ esac
 
 if test x$srcdir != x.; then
     INCLUDE="-Iinclude $INCLUDE"
-elif test -d .hg; then
+elif test -d .git; then
     as_fn_error $? "
-*** When building from Mercurial you should configure and build in a
+*** When building from a git clone you should configure and build in a
     separate directory so you don't clobber SDL_config.h, SDL_revision.h
 " "$LINENO" 5
 fi
diff --git a/configure.ac b/configure.ac
index 7d119ad3e..950a4886d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,9 +82,9 @@ esac
 
 if test x$srcdir != x.; then
     INCLUDE="-Iinclude $INCLUDE"
-elif test -d .hg; then
+elif test -d .git; then
     AC_MSG_ERROR([
-*** When building from Mercurial you should configure and build in a
+*** When building from a git clone you should configure and build in a
     separate directory so you don't clobber SDL_config.h, SDL_revision.h
 ])
 fi
diff --git a/docs/README-hg.md b/docs/README-hg.md
index 6562bcb0c..4e35683bd 100644
--- a/docs/README-hg.md
+++ b/docs/README-hg.md
@@ -1,6 +1,4 @@
-We are no longer hosted in Mercurial. The official repo is now:
-
-   https://github.com/libsdl-org/SDL
+We are no longer hosted in Mercurial. Please see README-git.md for details.
 
 Thanks!
 
diff --git a/docs/README-linux.md b/docs/README-linux.md
index c3685fbce..3136851a3 100644
--- a/docs/README-linux.md
+++ b/docs/README-linux.md
@@ -15,7 +15,7 @@ Build Dependencies
     
 Ubuntu 20.04, all available features enabled:
 
-sudo apt-get install build-essential mercurial make cmake autoconf automake \
+sudo apt-get install build-essential git make cmake autoconf automake \
 libtool libasound2-dev libpulse-dev libaudio-dev libx11-dev libxext-dev \
 libxrandr-dev libxcursor-dev libxi-dev libxinerama-dev libxxf86vm-dev \
 libxss-dev libgl1-mesa-dev libdbus-1-dev libudev-dev libgles2-mesa-dev \
diff --git a/docs/README.md b/docs/README.md
index 7e2c15108..68071ef33 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -35,7 +35,7 @@ More documentation and FAQs are available online at [the wiki](http://wiki.libsd
 - [DynAPI](README-dynapi.md)
 - [Emscripten](README-emscripten.md)
 - [Gesture](README-gesture.md)
-- [Mercurial](README-hg.md)
+- [Git](README-git.md)
 - [iOS](README-ios.md)
 - [Linux](README-linux.md)
 - [OS X](README-macosx.md)
diff --git a/include/SDL_version.h b/include/SDL_version.h
index a2b63e121..a78ac72e4 100644
--- a/include/SDL_version.h
+++ b/include/SDL_version.h
@@ -142,13 +142,15 @@ extern DECLSPEC void SDLCALL SDL_GetVersion(SDL_version * ver);
 extern DECLSPEC const char *SDLCALL SDL_GetRevision(void);
 
 /**
- *  \brief Get the revision number of SDL that is linked against your program.
+ *  \brief Obsolete function, do not use.
  *
- *  Returns a number uniquely identifying the exact revision of the SDL
- *  library in use. It is an incrementing number based on commits to
- *  hg.libsdl.org.
+ *  When SDL was hosted in a Mercurial repository, and was built carefully,
+ *  this would return the revision number that the build was created from.
+ *  This number was not reliable for several reasons, but more importantly,
+ *  SDL is now hosted in a git repository, which does not offer numbers at
+ *  all, only hashes. This function only ever returns zero now. Don't use it.
  */
-extern DECLSPEC int SDLCALL SDL_GetRevisionNumber(void);
+extern SDL_DEPRECATED DECLSPEC int SDLCALL SDL_GetRevisionNumber(void);
 
 
 /* Ends C function definitions when using C++ */
diff --git a/src/SDL.c b/src/SDL.c
index cf6d7d789..124aceebf 100644
--- a/src/SDL.c
+++ b/src/SDL.c
@@ -468,7 +468,7 @@ SDL_GetRevision(void)
 int
 SDL_GetRevisionNumber(void)
 {
-    return SDL_REVISION_NUMBER;
+    return 0;  /* doesn't make sense without Mercurial. */
 }
 
 /* Get the name of the platform */
diff --git a/src/dynapi/gendynapi.pl b/src/dynapi/gendynapi.pl
index 42a5ece0b..beb4a359c 100755
--- a/src/dynapi/gendynapi.pl
+++ b/src/dynapi/gendynapi.pl
@@ -21,7 +21,7 @@
 
 # WHAT IS THIS?
 #  When you add a public API to SDL, please run this script, make sure the
-#  output looks sane (hg diff, it adds to existing files), and commit it.
+#  output looks sane (git diff, it adds to existing files), and commit it.
 #  It keeps the dynamic API jump table operating correctly.
 
 # If you wanted this to be readable, you shouldn't have used perl.
diff --git a/test/testautomation_platform.c b/test/testautomation_platform.c
index 7cc732a7b..d4a68ca0e 100644
--- a/test/testautomation_platform.c
+++ b/test/testautomation_platform.c
@@ -141,9 +141,6 @@ int platform_testGetFunctions (void *arg)
    SDLTest_AssertPass("SDL_GetRevision()");
    SDLTest_AssertCheck(revision != NULL, "SDL_GetRevision() != NULL");
 
-   ret = SDL_GetRevisionNumber();
-   SDLTest_AssertPass("SDL_GetRevisionNumber()");
-
    return TEST_COMPLETED;
 }
 
diff --git a/test/testver.c b/test/testver.c
index d8c937e47..b31363c86 100644
--- a/test/testver.c
+++ b/test/testver.c
@@ -35,13 +35,13 @@ main(int argc, char *argv[])
     SDL_Log("Compiled with SDL older than 2.0\n");
 #endif
     SDL_VERSION(&compiled);
-    SDL_Log("Compiled version: %d.%d.%d.%d (%s)\n",
+    SDL_Log("Compiled version: %d.%d.%d (%s)\n",
            compiled.major, compiled.minor, compiled.patch,
-           SDL_REVISION_NUMBER, SDL_REVISION);
+           SDL_REVISION);
     SDL_GetVersion(&linked);
-    SDL_Log("Linked version: %d.%d.%d.%d (%s)\n",
+    SDL_Log("Linked version: %d.%d.%d (%s)\n",
            linked.major, linked.minor, linked.patch,
-           SDL_GetRevisionNumber(), SDL_GetRevision());
+           SDL_GetRevision());
     SDL_Quit();
     return (0);
 }