This patch differs from upstream in the following ways:

  * it does not modify doc/manual/R-admin.texi

From da6638896413bcbb5970b2335b92582853f94e3c Mon Sep 17 00:00:00 2001
From: ripley <ripley@00db46b3-68df-0310-9c12-caf00c1e9a41>
Date: Sat, 25 Mar 2023 09:01:30 +0000
Subject: [PATCH] allow libcurl 8 as its API/ABI is said to be unchanged

git-svn-id: https://svn.r-project.org/R/trunk@84049 00db46b3-68df-0310-9c12-caf00c1e9a41
---
 configure               |  6 +++---
 doc/manual/R-admin.texi | 13 ++++++-------
 m4/R.m4                 |  4 ++--
 3 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index c71e78d5017..f5e8e4992f7 100755
--- a/configure
+++ b/configure
@@ -51680,8 +51680,8 @@ fi
 done
 
 if test "x${have_libcurl}" = "xyes"; then
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if libcurl is version 7 and >= 7.28.0" >&5
-printf %s "checking if libcurl is version 7 and >= 7.28.0... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if libcurl is >= 7.28.0" >&5
+printf %s "checking if libcurl is >= 7.28.0... " >&6; }
 if test ${r_cv_have_curl728+y}
 then :
   printf %s "(cached) " >&6
@@ -51699,7 +51699,7 @@ int main(void)
 {
 #ifdef LIBCURL_VERSION_MAJOR
 #if LIBCURL_VERSION_MAJOR > 7
-  exit(1);
+  exit(0);
 #elif LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 28
   exit(0);
 #else
diff --git a/m4/R.m4 b/m4/R.m4
index 214dc1a8c7d..c4b9aa8f1c1 100644
--- a/m4/R.m4
+++ b/m4/R.m4
@@ -4620,7 +4620,7 @@ LIBS="${CURL_LIBS} ${LIBS}"
 AC_CHECK_HEADERS(curl/curl.h, [have_libcurl=yes], [have_libcurl=no])
 
 if test "x${have_libcurl}" = "xyes"; then
-AC_CACHE_CHECK([if libcurl is version 7 and >= 7.28.0], [r_cv_have_curl728],
+AC_CACHE_CHECK([if libcurl is >= 7.28.0], [r_cv_have_curl728],
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdlib.h>
 #include <curl/curl.h>
@@ -4628,7 +4628,7 @@ int main(void)
 {
 #ifdef LIBCURL_VERSION_MAJOR
 #if LIBCURL_VERSION_MAJOR > 7
-  exit(1);
+  exit(0);
 #elif LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 28
   exit(0);
 #else