app-arch/gzip: fix build on arm64

Closes: https://bugs.gentoo.org/983039
Signed-off-by: Sam James <sam@gentoo.org>

app-arch/gzip/files/gzip-1.15-arm64.patch

@@ -0,0 +1,42 @@
+https://bugs.gentoo.org/983039
+https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=b4ed8e73401968bcad749afb0e636dd3ec205ca7
+
+From b4ed8e73401968bcad749afb0e636dd3ec205ca7 Mon Sep 17 00:00:00 2001
+From: Jim Meyering <meyering@meta.com>
+Date: Mon, 21 Sep 2026 01:42:18 -0700
+Subject: build: avoid failure to build on linux aarch64
+
+* gzip.c: Include gzip.h only after all system headers.
+gzip.h's "head" definition affected a subsequent signal.h-
+included system struct member named "head".
+Reported by Adam Sampson in https://bugs.gnu.org/81904
+---
+ gzip.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/gzip.c b/gzip.c
+index 220f6fc..6c0af7f 100644
+--- a/gzip.c
++++ b/gzip.c
+@@ -58,7 +58,6 @@ static char const license_msg[] =
+ 
+ #include "tailor.h"
+ 
+-#include "gzip.h"
+ #include "lzw.h"
+ #include "revision.h"
+ #include "version.h"
+@@ -99,6 +98,11 @@ static char const license_msg[] =
+ #  include <utimens.h>
+ #endif
+ 
++/* Include this only after all system headers. Otherwise, its definition
++   of "head" conflicts with member names in linux-headers 7.2.6's
++   asm/sigcontext.h pulled in via <signal.h>.  */
++#include "gzip.h"
++
+ #ifndef MAX_PATH_LEN
+ #  define MAX_PATH_LEN   1024 /* max pathname length */
+ #endif
+-- 
+cgit v1.3

app-arch/gzip/gzip-1.15.ebuild

@@ -45,6 +45,7 @@ PDEPEND="
 
 PATCHES=(
 	"${FILESDIR}/${PN}-1.3.8-install-symlinks.patch"
+	"${FILESDIR}/${P}-arm64.patch"
 )
 
 src_configure() {