Hi, I'm running build on M1 Mac mini with Big Sur 11.6 installed and getting this error.

Any ideas how to fix this ?

building dav1d - version 0.9.2

dav1d-0.9.2.tar.gz has already downloaded.
Extracted dav1d-0.9.2.tar.gz
$ meson build --prefix=/Users/Petr/Downloads/ffmpeg-build-script/workspace --buildtype=release --default-library=static --libdir=/Users/Petr/Downloads/ffmpeg-build-script/workspace/lib
$ ninja -C build
ninja: Entering directory `build'
[1/135] Generating vcs_version.h with a custom command
fatal: not a git repository: '/Users/Petr/Downloads/ffmpeg-build-script/packages/dav1d-0.9.2/.git'
[2/135] Compiling C object src/libdav1d_bitdepth_8.a.p/ipred_prepare_tmpl.c.o
[3/135] Compiling C object src/libdav1d_bitdepth_8.a.p/cdef_apply_tmpl.c.o
[4/135] Compiling C object src/libdav1d_bitdepth_8.a.p/loopfilter_tmpl.c.o
[5/135] Compiling C object src/libdav1d_bitdepth_8.a.p/fg_apply_tmpl.c.o
[6/135] Compiling C object src/libdav1d_bitdepth_8.a.p/lf_apply_tmpl.c.o
[7/135] Compiling C object src/libdav1d_entrypoint.a.p/thread_task.c.o
[8/135] Compiling C object src/libdav1d_bitdepth_8.a.p/lr_apply_tmpl.c.o
[9/135] Compiling C object src/libdav1d_entrypoint.a.p/lib.c.o
[10/135] Compiling C object src/libdav1d_bitdepth_8.a.p/itx_tmpl.c.o
[11/135] Compiling C object src/libdav1d_bitdepth_8.a.p/cdef_tmpl.c.o
[12/135] Compiling C object src/libdav1d_bitdepth_8.a.p/film_grain_tmpl.c.o
[13/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_cdef_init_tmpl.c.o
[14/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_ipred_init_tmpl.c.o
[15/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_itx_init_tmpl.c.o
[16/135] Compiling C object src/libdav1d_bitdepth_8.a.p/looprestoration_tmpl.c.o
[17/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_loopfilter_init_tmpl.c.o
[18/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_film_grain_init_tmpl.c.o
[19/135] Compiling C object src/libdav1d_bitdepth_8.a.p/ipred_tmpl.c.o
[20/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_looprestoration_init_tmpl.c.o
[21/135] Compiling C object src/libdav1d_bitdepth_8.a.p/arm_mc_init_tmpl.c.o
[22/135] Compiling C object src/libdav1d.a.p/picture.c.o
[23/135] Compiling C object src/libdav1d_bitdepth_16.a.p/cdef_apply_tmpl.c.o
[24/135] Compiling C object src/libdav1d_bitdepth_16.a.p/ipred_prepare_tmpl.c.o
[25/135] Compiling C object src/libdav1d_bitdepth_16.a.p/fg_apply_tmpl.c.o
[26/135] Compiling C object src/libdav1d_bitdepth_16.a.p/loopfilter_tmpl.c.o
[27/135] Compiling C object src/libdav1d_bitdepth_16.a.p/cdef_tmpl.c.o
[28/135] Compiling C object src/libdav1d_bitdepth_16.a.p/lr_apply_tmpl.c.o
[29/135] Compiling C object src/libdav1d_bitdepth_16.a.p/lf_apply_tmpl.c.o
[30/135] Compiling C object src/libdav1d_bitdepth_16.a.p/film_grain_tmpl.c.o
[31/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_cdef_init_tmpl.c.o
[32/135] Compiling C object src/libdav1d_bitdepth_16.a.p/itx_tmpl.c.o
[33/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_ipred_init_tmpl.c.o
[34/135] Compiling C object src/libdav1d_bitdepth_16.a.p/ipred_tmpl.c.o
[35/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_loopfilter_init_tmpl.c.o
[36/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_film_grain_init_tmpl.c.o
[37/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_itx_init_tmpl.c.o
[38/135] Compiling C object src/libdav1d.a.p/refmvs.c.o
[39/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_looprestoration_init_tmpl.c.o
[40/135] Compiling C object src/libdav1d_bitdepth_16.a.p/looprestoration_tmpl.c.o
[41/135] Compiling C object src/libdav1d_bitdepth_16.a.p/arm_mc_init_tmpl.c.o
[42/135] Compiling C object src/libdav1d_bitdepth_8.a.p/mc_tmpl.c.o
[43/135] Compiling C object src/libdav1d.a.p/cpu.c.o
[44/135] Compiling C object src/libdav1d.a.p/dequant_tables.c.o
[45/135] Compiling C object src/libdav1d.a.p/data.c.o
[46/135] Compiling C object src/libdav1d.a.p/intra_edge.c.o
[47/135] Compiling C object src/libdav1d_bitdepth_8.a.p/recon_tmpl.c.o
[48/135] Compiling C object src/libdav1d.a.p/getbits.c.o
[49/135] Compiling C object src/libdav1d.a.p/log.c.o
[50/135] Compiling C object src/libdav1d.a.p/mem.c.o
[51/135] Compiling C object src/libdav1d.a.p/msac.c.o
[52/135] Compiling C object src/libdav1d.a.p/ref.c.o
[53/135] Compiling C object src/libdav1d.a.p/scan.c.o
[54/135] Compiling C object src/libdav1d.a.p/lf_mask.c.o
[55/135] Compiling C object src/libdav1d.a.p/qm.c.o
[56/135] Compiling C object src/libdav1d.a.p/tables.c.o
[57/135] Compiling C object src/libdav1d.a.p/itx_1d.c.o
[58/135] Compiling C object src/libdav1d.a.p/arm_cpu.c.o
[59/135] Compiling C object src/libdav1d.a.p/warpmv.c.o
[60/135] Compiling C object src/libdav1d.a.p/wedge.c.o
[61/135] Compiling C object src/libdav1d.a.p/arm_refmvs_init.c.o
[62/135] Compiling C object src/libdav1d.a.p/arm_64_refmvs.S.o
FAILED: src/libdav1d.a.p/arm_64_refmvs.S.o
cc -Isrc/libdav1d.a.p -Isrc -I../src -I. -I.. -Iinclude/dav1d -I../include/dav1d -Iinclude -I../include -fcolor-diagnostics -DNDEBUG -Wall -Winvalid-pch -Wextra -std=c99 -O3 -D_DARWIN_C_SOURCE -fvisibility=hidden -Wundef -Werror=vla -Wno-missing-field-initializers -Wno-unused-parameter -Wstrict-prototypes -Werror=missing-prototypes -Wshorten-64-to-32 -fomit-frame-pointer -ffast-math -MD -MQ src/libdav1d.a.p/arm_64_refmvs.S.o -MF src/libdav1d.a.p/arm_64_refmvs.S.o.d -o src/libdav1d.a.p/arm_64_refmvs.S.o -c ../src/arm/64/refmvs.S
../src/arm/64/refmvs.S:35:14: error: unknown token in expression
ld1 {v3.16b}, [x1]
^
../src/arm/64/refmvs.S:36:9: error: invalid instruction mnemonic 'clz'
clz w3, w3
^~~
../src/arm/64/refmvs.S:37:9: error: invalid instruction mnemonic 'adr'
adr x5, Lsplat_tbl
^~~
../src/arm/64/refmvs.S:38:21: error: unknown token in expression
sub w3, w3, #26
^
../src/arm/64/refmvs.S:39:37: error: unknown token in expression
ext v2.16b, v3.16b, v3.16b, #12
^