diff --git a/toolchain/toolchain-buildroot/Config.in b/toolchain/toolchain-buildroot/Config.in
index 6d55f87435..26d731d976 100644
--- a/toolchain/toolchain-buildroot/Config.in
+++ b/toolchain/toolchain-buildroot/Config.in
@@ -80,6 +80,18 @@ config BR2_TOOLCHAIN_BUILDROOT_MUSL
 
 	  https://www.musl-libc.org/
 
+config BR2_TOOLCHAIN_BUILDROOT_NONE
+	bool "none"
+	depends on !BR2_PACKAGE_UCLIBC_SUPPORTS && \
+		!BR2_PACKAGE_GLIBC_SUPPORTS && \
+		!BR2_PACKAGE_MUSL_SUPPORTS
+	help
+	  This option is visible if no C library is available for the
+	  currently selected configuration. If you select this option,
+	  the build will refuse to start as Buildroot needs a C
+	  library to build a toolchain. Change your configuration
+	  settings to make sure one of the C libraries is selected.
+
 endchoice
 
 config BR2_TOOLCHAIN_BUILDROOT_LIBC
diff --git a/utils/genrandconfig b/utils/genrandconfig
index e43452d5b7..257fe7b520 100755
--- a/utils/genrandconfig
+++ b/utils/genrandconfig
@@ -301,6 +301,10 @@ def fixup_config(sysinfo, configfile):
     if 'BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_NIOSII=y\n' in configlines and \
        'BR2_PACKAGE_FLANN=y\n' in configlines:
         return False
+    # No C library for internal toolchain
+    if 'BR2_TOOLCHAIN_BUILDROOT_NONE=y' in configlines:
+        return False
+
     if 'BR2_PACKAGE_AUFS_UTIL=y\n' in configlines and \
        'BR2_PACKAGE_AUFS_UTIL_VERSION=""\n' in configlines:
         return False