diff --git a/mkspecs/common/clang.conf b/mkspecs/common/clang.conf
index dad15a22a8..6eb08a9d2f 100644
--- a/mkspecs/common/clang.conf
+++ b/mkspecs/common/clang.conf
@@ -35,10 +35,12 @@ QMAKE_CXXFLAGS_CXX11             = -std=c++11
 QMAKE_CXXFLAGS_CXX14             = -std=c++1y
 QMAKE_CXXFLAGS_CXX1Z             = -std=c++1z
 QMAKE_CXXFLAGS_CXX2A             = -std=c++2a
+QMAKE_CXXFLAGS_CXX2B             = -std=c++2b
 QMAKE_CXXFLAGS_GNUCXX11          = -std=gnu++11
 QMAKE_CXXFLAGS_GNUCXX14          = -std=gnu++1y
 QMAKE_CXXFLAGS_GNUCXX1Z          = -std=gnu++1z
 QMAKE_CXXFLAGS_GNUCXX2A          = -std=gnu++2a
+QMAKE_CXXFLAGS_GNUCXX2B          = -std=gnu++2b
 
 QMAKE_LFLAGS_CXX11      =
 QMAKE_LFLAGS_CXX14      =
diff --git a/mkspecs/common/g++-base.conf b/mkspecs/common/g++-base.conf
index c337696304..d392879f66 100644
--- a/mkspecs/common/g++-base.conf
+++ b/mkspecs/common/g++-base.conf
@@ -33,10 +33,12 @@ QMAKE_CXXFLAGS_CXX11    = -std=c++11
 QMAKE_CXXFLAGS_CXX14    = -std=c++1y
 QMAKE_CXXFLAGS_CXX1Z    = -std=c++1z
 QMAKE_CXXFLAGS_CXX2A    = -std=c++2a
+QMAKE_CXXFLAGS_CXX2B    = -std=c++2b
 QMAKE_CXXFLAGS_GNUCXX11 = -std=gnu++11
 QMAKE_CXXFLAGS_GNUCXX14 = -std=gnu++1y
 QMAKE_CXXFLAGS_GNUCXX1Z = -std=gnu++1z
 QMAKE_CXXFLAGS_GNUCXX2A = -std=gnu++2a
+QMAKE_CXXFLAGS_GNUCXX2B = -std=gnu++2b
 QMAKE_LFLAGS_CXX11      =
 QMAKE_LFLAGS_CXX14      =
 QMAKE_LFLAGS_CXX1Z      =
diff --git a/mkspecs/common/msvc-version.conf b/mkspecs/common/msvc-version.conf
index 13dd349cf4..303b341e9d 100644
--- a/mkspecs/common/msvc-version.conf
+++ b/mkspecs/common/msvc-version.conf
@@ -120,6 +120,7 @@ greaterThan(QMAKE_MSC_VER, 1919) {
     MSVC_VER            = 16.0
     MSVC_TOOLSET_VER    = 142
     QMAKE_CXXFLAGS_CXX2A = -std:c++latest
+    QMAKE_CXXFLAGS_CXX2B = -std:c++latest
 
     QMAKE_CXXFLAGS     += -Zc:externConstexpr
 }
diff --git a/mkspecs/features/default_post.prf b/mkspecs/features/default_post.prf
index b94aab3e9c..2be446e41e 100644
--- a/mkspecs/features/default_post.prf
+++ b/mkspecs/features/default_post.prf
@@ -123,17 +123,18 @@ breakpad {
 
 c++17: CONFIG += c++1z
 c++20: CONFIG += c++2a
-c++latest: CONFIG *= c++2a c++1z c++14 c++11
+c++latest: CONFIG *= c++2b c++2a c++1z c++14 c++11
 
-!c++1z:!c++2a {
+!c++1z:!c++2a:!c++2b {
     # Qt requires C++17
     QT_COMPILER_STDCXX_no_L = $$replace(QT_COMPILER_STDCXX, "L$", "")
     !greaterThan(QT_COMPILER_STDCXX_no_L, 201402): CONFIG += c++1z
 }
-c++1z|c++2a {
+c++1z|c++2a|c++2b {
     # Disable special compiler flags for host builds
     !host_build|!cross_compile {
-        c++2a:       cxxstd = CXX2A
+        c++2b:       cxxstd = CXX2B
+        else:c++2a:  cxxstd = CXX2A
         else:        cxxstd = CXX1Z
     } else {
         # Fall back to c++17, because C++17 is required everywhere,
diff --git a/mkspecs/features/qt_common.prf b/mkspecs/features/qt_common.prf
index f51b32660b..0f436ffacf 100644
--- a/mkspecs/features/qt_common.prf
+++ b/mkspecs/features/qt_common.prf
@@ -18,6 +18,7 @@ qtConfig(c++11): CONFIG += c++11 strict_c++
 qtConfig(c++14): CONFIG += c++14
 qtConfig(c++1z): CONFIG += c++1z
 qtConfig(c++2a): CONFIG += c++2a
+qtConfig(c++2b): CONFIG += c++2b
 qtConfig(c99): CONFIG += c99
 qtConfig(c11): CONFIG += c11
 qtConfig(separate_debug_info): CONFIG += separate_debug_info
@@ -162,4 +163,3 @@ warnings_are_errors:warning_clean {
     }
     unset(ver)
 }
-