diff --git a/package/mongrel2/Config.in b/package/mongrel2/Config.in
index 435d97eaff..680e0ce268 100644
--- a/package/mongrel2/Config.in
+++ b/package/mongrel2/Config.in
@@ -1,3 +1,10 @@
+comment "mongrel2 needs a toolchain w/ C++, IPv6, threads, largefile, wchar"
+	depends on BR2_UCLIBC_VERSION_SNAPSHOT || \
+		BR2_TOOLCHAIN_USES_GLIBC || \
+		BR2_arm
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_INET_IPV6 || \
+		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_LARGEFILE || !BR2_USE_WCHAR
+
 config BR2_PACKAGE_MONGREL2
 	bool "mongrel2"
 	select BR2_PACKAGE_SQLITE