The arm64 patches we backported to 3.4.6 mean we need to autoreconf ourselves,
apply this patch to avoid needing to do it in the ebuild b/c of deps.
--- a/Makefile.in
+++ b/Makefile.in
@@ -330,8 +330,8 @@ am__define_uniq_tagged_files = \
   done | $(am__uniquify_input)`
 DIST_SUBDIRS = include testsuite man doc
 am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/fficonfig.h.in \
-	$(srcdir)/libffi.pc.in README.md compile config.guess \
-	config.sub depcomp install-sh ltmain.sh missing
+	$(srcdir)/libffi.pc.in ChangeLog README.md compile \
+	config.guess config.sub depcomp install-sh ltmain.sh missing
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
--- a/fficonfig.h.in
+++ b/fficonfig.h.in
@@ -31,6 +31,9 @@
 /* Define to 1 if you have the <alloca.h> header file. */
 #undef HAVE_ALLOCA_H
 
+/* Define if your compiler supports pointer authentication. */
+#undef HAVE_ARM64E_PTRAUTH
+
 /* Define if your assembler supports .cfi_* directives. */
 #undef HAVE_AS_CFI_PSEUDO_OP
 
@@ -71,9 +74,6 @@
 /* Define to 1 if you have the `memfd_create' function. */
 #undef HAVE_MEMFD_CREATE
 
-/* Define if your compiler supports pointer authentication. */
-#undef HAVE_PTRAUTH
-
 /* Define if .eh_frame sections should be read-only. */
 #undef HAVE_RO_EH_FRAME
 
--- a/testsuite/Makefile.in
+++ b/testsuite/Makefile.in
@@ -292,7 +292,7 @@ EXTRA_DEJAGNU_SITE_CONFIG = ../local.exp
 CLEANFILES = *.exe core* *.log *.sum
 EXTRA_DIST = config/default.exp emscripten/build.sh emscripten/conftest.py \
 	emscripten/node-tests.sh emscripten/test.html emscripten/test_libffi.py \
-  emscripten/build-tests.sh lib/libffi.exp lib/target-libpath.exp \
+	emscripten/build-tests.sh lib/libffi.exp lib/target-libpath.exp \
 	lib/wrapper.exp libffi.bhaible/Makefile libffi.bhaible/README \
 	libffi.bhaible/alignof.h libffi.bhaible/bhaible.exp libffi.bhaible/test-call.c \
 	libffi.bhaible/test-callback.c libffi.bhaible/testcases.c libffi.call/align_mixed.c \