strip: elf_strptr failed: Invalid argument

Hello,

I'm trying to build packages on an rpi3, on a freshly build image (with 
crochet), and when it's trying to build pkg from ports, I'm getting the 
following error message:

libtool: link: cc -D_BSD_SOURCE -I../libpkg -I../libpkg -I../compat 
-I../external/libucl/klib -I../external/uthash -I../external/expat/lib 
-DGITHASH=\"\" -O2 -pipe -Wno-error -fno-strict-aliasing -Wall 
-Wno-unused-function -D_BSD_SOURCE -DINET6=1 -Wl,--enable-new-dtags -o 
.libs/pkg pkg-add.o pkg-alias.o pkg-annotate.o pkg-audit.o 
pkg-autoremove.o pkg-backup.o pkg-check.o pkg-clean.o pkg-config.o 
pkg-convert.o pkg-create.o pkg-delete.o pkg-event.o pkg-fetch.o 
pkg-globals.o pkg-info.o pkg-install.o pkg-lock.o pkg-main.o 
pkg-plugins.o pkg-query.o pkg-register.o pkg-repo.o pkg-rquery.o 
pkg-search.o pkg-set.o pkg-shell.o pkg-shlib.o pkg-ssh.o pkg-stats.o 
pkg-update.o pkg-updating.o pkg-upgrade.o pkg-utils.o pkg-version.o 
pkg-which.o  ../libpkg/.libs/libpkg.so ../compat/.libs/libbsd_compat.a 
-lutil -lssl -lcrypto -lm -lelf -ljail -larchive -lz -lbz2 -llzma 
-Wl,-rpath -Wl,/usr/local/lib
  /bin/mkdir -p '/usr/ports/ports-mgmt/pkg/work/stage/usr/local/etc'
  install  -m 0644 pkg.conf.sample 
'/usr/ports/ports-mgmt/pkg/work/stage/usr/local/etc'
  /bin/mkdir -p '/usr/ports/ports-mgmt/pkg/work/stage/usr/local/sbin'
  STRIPPROG='strip' /bin/sh ../libtool   --mode=install /bin/sh 
/usr/ports/ports-mgmt/pkg/work/pkg-1.10.1/install-sh -c -s pkg-static 
pkg '/usr/ports/ports-mgmt/pkg/work/stage/usr/local/sbin'
libtool: install: /bin/sh 
/usr/ports/ports-mgmt/pkg/work/pkg-1.10.1/install-sh -c -s pkg-static 
/usr/ports/ports-mgmt/pkg/work/stage/usr/local/sbin/pkg-static
strip: elf_strptr failed: Invalid argument
*** Error code 1

Stop.
make[5]: stopped in /usr/ports/ports-mgmt/pkg/work/pkg-1.10.1/src
*** Error code 1

Strange part, it says it's stripped already:

root_at_build:/usr/ports/ports-mgmt/pkg # file -s 
./work/pkg-1.10.1/src/pkg-static
./work/pkg-1.10.1/src/pkg-static: ELF 64-bit LSB executable, ARM 
aarch64, version 1 (FreeBSD), statically linked, stripped

However, trying to strip(1) manually reproduces the error:

# strip ~/pkg-static.1
strip: elf_strptr failed: Invalid argument

ktrace didn't reveal anything about the failing elf_strptr(3) call.

The system is:

FreeBSD build.aegir 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r320657: Tue 
Jul  4 22:28:33 CEST 2017 
aegir_at_marvin.harmless.hu:/tank/rpi3/crochet/work/obj/arm64.aarch64/tank/rpi3/src/sys/AEGIR 
arm64

Could someone please help me with this? I don't really know how to solve 
this, or where to start looking. Usually building pkg works out of box.

Best regards,
Gergely