https://bugs.gentoo.org/784173
--- a/configure.ac
+++ b/configure.ac
@@ -857,7 +857,7 @@
     else
 
       save_cxxflags="$CXXFLAGS"
-      cxxflags_to_try="-std=c++17 -stdlib=libstdc++"
+      cxxflags_to_try="-std=c++17"
       CXXFLAGS_TO_USE=""
 
       AC_MSG_CHECKING([supported C++ compiler flags])