diff --git a/Sources/FoundationNetworking/URLSession/libcurl/EasyHandle.swift b/Sources/FoundationNetworking/URLSession/libcurl/EasyHandle.swift
index cdf8875fce..e9b90a23f1 100644
--- a/Sources/FoundationNetworking/URLSession/libcurl/EasyHandle.swift
+++ b/Sources/FoundationNetworking/URLSession/libcurl/EasyHandle.swift
@@ -29,15 +29,15 @@ import Dispatch
 // These helper functions avoid warnings about "will never be executed" code which checks the availability of the underlying libcurl features.
 
 internal func curlInfoCAInfoSupported() -> Bool {
-    NS_CURL_CURLINFO_CAINFO_SUPPORTED == 1
+    CFURLSessionInfoCAINFO.value != CFURLSessionInfoNONE.value
 }
 
 internal func maxHostConnectionsSupported() -> Bool {
-    NS_CURL_MAX_HOST_CONNECTIONS_SUPPORTED == 1
+    CFURLSessionMultiOptionMAX_HOST_CONNECTIONS.value != 0
 }
 
 internal func xferInfoFunctionSupported() -> Bool {
-    NS_CURL_XFERINFOFUNCTION_SUPPORTED == 1
+    CFURLSessionOptionXFERINFOFUNCTION.value != 0
 }
 
 /// Minimal wrapper around the [curl easy interface](https://curl.haxx.se/libcurl/c/)
diff --git a/Sources/_CFURLSessionInterface/CFURLSessionInterface.c b/Sources/_CFURLSessionInterface/CFURLSessionInterface.c
index e493ad77e8..327397fe78 100644
--- a/Sources/_CFURLSessionInterface/CFURLSessionInterface.c
+++ b/Sources/_CFURLSessionInterface/CFURLSessionInterface.c
@@ -23,6 +23,31 @@
 #include "CFString.h"
 #include <curl/curl.h>
 
+#if !defined(LIBCURL_VERSION_MAJOR)
+#error "LIBCURL_VERSION_MAJOR not defined, missing curlver.h"
+#endif
+
+// 7.84.0 or later
+#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 84) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 84 && LIBCURL_VERSION_PATCH >= 0)
+#define NS_CURL_CURLINFO_CAINFO_SUPPORTED 1
+#else
+#define NS_CURL_CURLINFO_CAINFO_SUPPORTED 0
+#endif
+
+// 7.30.0 or later
+#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 30) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 30 && LIBCURL_VERSION_PATCH >= 0)
+#define NS_CURL_MAX_HOST_CONNECTIONS_SUPPORTED 1
+#else
+#define NS_CURL_MAX_HOST_CONNECTIONS_SUPPORTED 0
+#endif
+
+// 7.32.0 or later
+#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 32) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 32 && LIBCURL_VERSION_PATCH >= 0)
+#define NS_CURL_XFERINFOFUNCTION_SUPPORTED 1
+#else
+#define NS_CURL_XFERINFOFUNCTION_SUPPORTED 0
+#endif
+
 FILE* aa = NULL;
 CURL * gcurl = NULL;
 
@@ -223,7 +248,7 @@ CFURLSessionEasyCode const CFURLSessionEasyCodeFTP_COULDNT_RETR_FILE = { CURLE_F
 #if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 67) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 67 && LIBCURL_VERSION_PATCH >= 1)
 CFURLSessionEasyCode const CFURLSessionEasyCodeHTTP3 = { CURLE_HTTP3 };
 #else
-CFURLSessionEasyCode const CFURLSessionEasyCodeOBSOLETE20 = { CURLE_OBSOLETE20 };
+CFURLSessionEasyCode const CFURLSessionEasyCodeHTTP3 = { CURLE_OBSOLETE20 };
 #endif
 CFURLSessionEasyCode const CFURLSessionEasyCodeQUOTE_ERROR = { CURLE_QUOTE_ERROR };
 CFURLSessionEasyCode const CFURLSessionEasyCodeHTTP_RETURNED_ERROR = { CURLE_HTTP_RETURNED_ERROR };
diff --git a/Sources/_CFURLSessionInterface/include/CFURLSessionInterface.h b/Sources/_CFURLSessionInterface/include/CFURLSessionInterface.h
index 64c3495543..c6ca3766be 100644
--- a/Sources/_CFURLSessionInterface/include/CFURLSessionInterface.h
+++ b/Sources/_CFURLSessionInterface/include/CFURLSessionInterface.h
@@ -35,26 +35,6 @@
 #include <winsock2.h>
 #endif
 
-// 7.84.0 or later
-#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 84) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 84 && LIBCURL_VERSION_PATCH >= 0)
-#define NS_CURL_CURLINFO_CAINFO_SUPPORTED 1
-#else
-#define NS_CURL_CURLINFO_CAINFO_SUPPORTED 0
-#endif
-
-// 7.30.0 or later
-#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 30) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 30 && LIBCURL_VERSION_PATCH >= 0)
-#define NS_CURL_MAX_HOST_CONNECTIONS_SUPPORTED 1
-#else
-#define NS_CURL_MAX_HOST_CONNECTIONS_SUPPORTED 0
-#endif
-
-// 7.32.0 or later
-#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 32) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 32 && LIBCURL_VERSION_PATCH >= 0)
-#define NS_CURL_XFERINFOFUNCTION_SUPPORTED 1
-#else
-#define NS_CURL_XFERINFOFUNCTION_SUPPORTED 0
-#endif
 
 CF_IMPLICIT_BRIDGING_ENABLED
 CF_EXTERN_C_BEGIN
@@ -104,11 +84,7 @@ CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeFTP_CANT_GET_HOST; // C
 CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeFTP_COULDNT_SET_TYPE; // CURLE_FTP_COULDNT_SET_TYPE
 CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodePARTIAL_FILE; // CURLE_PARTIAL_FILE
 CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeFTP_COULDNT_RETR_FILE; // CURLE_FTP_COULDNT_RETR_FILE
-#if LIBCURL_VERSION_MAJOR > 7 || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR > 67) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR == 67 && LIBCURL_VERSION_PATCH >= 1)
-CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeHTTP3; // CURLE_HTTP3
-#else
-CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeOBSOLETE20; // CURLE_OBSOLETE20
-#endif
+CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeHTTP3; // CURLE_HTTP3 || CURLE_OBSOLETE20
 CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeQUOTE_ERROR; // CURLE_QUOTE_ERROR
 CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeHTTP_RETURNED_ERROR; // CURLE_HTTP_RETURNED_ERROR
 CF_EXPORT CFURLSessionEasyCode const CFURLSessionEasyCodeWRITE_ERROR; // CURLE_WRITE_ERROR