[klibc] [klibc:master] README.klibc: Add note about headers_install in cross-build

[klibc-bot for Ben Hutchings]

Commit-ID:  6ded7f0ecaafc59460c82890f04cef3d86f58383
Gitweb:     http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=6ded7f0ecaafc59460c82890f04cef3d86f58383
Author:     Ben Hutchings <ben at decadent.org.uk>
AuthorDate: Tue, 2 Aug 2022 23:03:27 +0200
Committer:  Ben Hutchings <ben at decadent.org.uk>
CommitDate: Thu, 4 Aug 2022 00:48:26 +0200

[klibc] README.klibc: Add note about headers_install in cross-build

When cross-compiling, it's critical to get the kernel UAPI headers for
the target architectures.  Add a sentence about this to the "Cross-
compiling" section.

Signed-off-by: Ben Hutchings <ben at decadent.org.uk>

---
 usr/klibc/README.klibc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/usr/klibc/README.klibc b/usr/klibc/README.klibc
index f562661f..6162ad3a 100644
--- a/usr/klibc/README.klibc
+++ b/usr/klibc/README.klibc
@@ -22,7 +22,9 @@ Cross-compiling
 
 If you're cross-compiling, you need to set KLIBCARCH to the
 appropriate architecture, and set CROSS_COMPILE to your toolchain
-prefix, on the "make" command line
+prefix, on the "make" command line.  You also need to set ARCH to the
+appropriate kernel architecture name on the "make headers_install"
+command line.
 
 IMPORTANT: if you're on a 64-bit machine with a 32-bit userland
 (ia64, mips64, ppc64 sparc64, s390x or x86_64), and you want to