https://github.com/libsdl-org/autoconf/commit/a97e8d68d7967a9fe4849f35ed1ac3fd1ee36b72
From a97e8d68d7967a9fe4849f35ed1ac3fd1ee36b72 Mon Sep 17 00:00:00 2001
From: Ben Elliston <[EMAIL REDACTED]>
Date: Sun, 27 Dec 1998 01:38:24 +0000
Subject: [PATCH] 1998-12-27 Ben Elliston <bje@cygnus.com> *
acspecific.m4 (AC_CYGWIN32): Warn about deprecated usage. Forward to
AC_CYGWIN.
---
ChangeLog | 3 ++-
acspecific.m4 | 5 +++++
lib/autoconf/specific.m4 | 5 +++++
3 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index de00a255..ea7e508d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,8 @@
1998-12-27 Ben Elliston <bje@cygnus.com>
* acspecific.m4 (AC_CYGWIN): Rename from `AC_CYGWIN32'.
-
+ (AC_CYGWIN32): Warn about deprecated usage. Forward to AC_CYGWIN.
+
* config.sub: Drop `32' from `Cygwin32'.
* config.guess: Likewise.
diff --git a/acspecific.m4 b/acspecific.m4
index 340d553a..66142d24 100644
--- a/acspecific.m4
+++ b/acspecific.m4
@@ -2611,6 +2611,11 @@ AC_SUBST(X_LIBS)dnl
AC_SUBST(X_EXTRA_LIBS)dnl
])
+dnl The old Cygwin32 macro is deprecated.
+AC_DEFUN(AC_CYGWIN32,
+[AC_OBSOLETE([$0], [; instead use AC_CYGWIN])dnl
+AC_CYGWIN])
+
dnl Check for Cygwin. This is a way to set the right value for
dnl EXEEXT.
AC_DEFUN(AC_CYGWIN,
diff --git a/lib/autoconf/specific.m4 b/lib/autoconf/specific.m4
index 340d553a..66142d24 100644
--- a/lib/autoconf/specific.m4
+++ b/lib/autoconf/specific.m4
@@ -2611,6 +2611,11 @@ AC_SUBST(X_LIBS)dnl
AC_SUBST(X_EXTRA_LIBS)dnl
])
+dnl The old Cygwin32 macro is deprecated.
+AC_DEFUN(AC_CYGWIN32,
+[AC_OBSOLETE([$0], [; instead use AC_CYGWIN])dnl
+AC_CYGWIN])
+
dnl Check for Cygwin. This is a way to set the right value for
dnl EXEEXT.
AC_DEFUN(AC_CYGWIN,