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-rw-r--r--libc/sysdeps/linux/Makefile.arch4
1 files changed, 4 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/Makefile.arch b/libc/sysdeps/linux/Makefile.arch
index a954e69ba..a2d675294 100644
--- a/libc/sysdeps/linux/Makefile.arch
+++ b/libc/sysdeps/linux/Makefile.arch
@@ -5,6 +5,10 @@
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
#
+ifeq ($(TARGET_ARCH),)
+$(error TARGET_ARCH is not set, no .config exists in topdir)
+endif
+
ARCH_DIR := $(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
ARCH_OUT := $(top_builddir)libc/sysdeps/linux/$(TARGET_ARCH)