diff --git a/package/Makefile.in b/package/Makefile.in
index 508ea7c366..580e9d14ca 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -51,8 +51,12 @@ ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
 LIBC = uclibc
 else ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
 LIBC = musl
-else
+else ifeq ($(BR2_TOOLCHAIN_USES_GLIBC),y)
 LIBC = gnu
+else
+# This happens if there is a bug in Buildroot that allows an
+# architecture configuration that isn't supported by any library.
+$(error No C library enabled, this is not possible.)
 endif
 
 # The ABI suffix is a bit special on ARM, as it needs to be