From 5f37ea60d2b45c531a1cd92df6d65d165964ca51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Thu, 20 Mar 2025 01:46:43 +0300
Subject: [PATCH] =?UTF-8?q?mdbx++:=20=D0=BF=D1=80=D0=BE=D0=B2=D0=B5=D1=80?=
 =?UTF-8?q?=D0=BA=D0=B0=20`=5F=5Fcpp=5Fconcepts=20>=3D=20202002`=20=D0=B4?=
 =?UTF-8?q?=D0=BB=D1=8F=20=D0=B8=D1=81=D0=BF=D0=BE=D0=BB=D1=8C=D0=B7=D0=BE?=
 =?UTF-8?q?=D0=B2=D0=B0=D0=BD=D0=B8=D1=8F=20=D0=BA=D0=BE=D0=BD=D1=86=D0=B5?=
 =?UTF-8?q?=D0=BF=D1=82=D0=BE=D0=B2=20C++=20(backport).?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 mdbx.h++ | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mdbx.h++ b/mdbx.h++
index e6186b1e..55bfc8e9 100644
--- a/mdbx.h++
+++ b/mdbx.h++
@@ -243,7 +243,7 @@
 #endif /* MDBX_CXX20_UNLIKELY */
 
 #ifndef MDBX_HAVE_CXX20_CONCEPTS
-#if defined(__cpp_lib_concepts) && __cpp_lib_concepts >= 202002L
+#if defined(__cpp_concepts) && __cpp_concepts >= 202002L && defined(__cpp_lib_concepts) && __cpp_lib_concepts >= 202002L
 #include <concepts>
 #define MDBX_HAVE_CXX20_CONCEPTS 1
 #elif defined(DOXYGEN)