diff --git a/configure/os/CONFIG.Common.RHEL8-x86_64 b/configure/os/CONFIG.Common.RHEL8-x86_64
index 757bcb323..a4ac7c32f 100644
--- a/configure/os/CONFIG.Common.RHEL8-x86_64
+++ b/configure/os/CONFIG.Common.RHEL8-x86_64
@@ -1,2 +1,5 @@
 # Include definitions common to linux pentium targets
 include $(CONFIG)/os/CONFIG.Common.linux-x86_64
+
+# highest c++ standard that is compiler can do
+STD_CXXFLAGS = -std=c++2a
diff --git a/configure/os/CONFIG.Common.RHEL8-x86_64-clang b/configure/os/CONFIG.Common.RHEL8-x86_64-clang
index fa50b4f9c..b93ce65ff 100644
--- a/configure/os/CONFIG.Common.RHEL8-x86_64-clang
+++ b/configure/os/CONFIG.Common.RHEL8-x86_64-clang
@@ -1 +1,3 @@
 include $(CONFIG)/os/CONFIG.Common.linux-clang
+
+STD_CXXFLAGS = -std=c++2a