diff --git a/support/gnuconfig/README.buildroot b/support/gnuconfig/README.buildroot
index 979edf32d9..952eea8b10 100644
--- a/support/gnuconfig/README.buildroot
+++ b/support/gnuconfig/README.buildroot
@@ -18,4 +18,4 @@ Run the script 'update' in this directory, and commit the result.
 The current Buildroot version is based on this commit of the config.git
 repository (leave alone on its own line, the script updates it):
 
-e072cc210e5d0584396f6c13ba34cb9c7bd8538d
+d7a4dee7cc25e332b990d0a6d9f0ddd42cb33cf5
diff --git a/support/gnuconfig/config.guess b/support/gnuconfig/config.guess
index 9aff91cfd0..8d70ec2b26 100755
--- a/support/gnuconfig/config.guess
+++ b/support/gnuconfig/config.guess
@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2020 Free Software Foundation, Inc.
 
-timestamp='2020-08-17'
+timestamp='2020-09-19'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -150,17 +150,15 @@ Linux|GNU|GNU/*)
 	#elif defined(__dietlibc__)
 	LIBC=dietlibc
 	#else
+	#include <stdarg.h>
+	#ifdef __DEFINED_va_list
+	LIBC=musl
+	#else
 	LIBC=gnu
 	#endif
+	#endif
 	EOF
 	eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
-
-	# If ldd exists, use it to detect musl libc.
-	if command -v ldd >/dev/null && \
-		ldd --version 2>&1 | grep -q ^musl
-	then
-	    LIBC=musl
-	fi
 	;;
 esac
 
diff --git a/support/gnuconfig/config.sub b/support/gnuconfig/config.sub
index 780c2bbaa0..2df66beeb0 100755
--- a/support/gnuconfig/config.sub
+++ b/support/gnuconfig/config.sub
@@ -1733,7 +1733,9 @@ esac
 # As a final step for OS-related things, validate the OS-kernel combination
 # (given a valid OS), if there is a kernel.
 case $kernel-$os in
-	linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib* | linux-musl* | linux-uclibc* )
+	linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib* | linux-musl* | linux-uclibc* | uclinux-gnu* | uclinux-uclibc* )
+		;;
+	uclinux-uclibc* )
 		;;
 	-dietlibc* | -newlib* | -musl* | -uclibc* )
 		# These are just libc implementations, not actual OSes, and thus