picotls fails to build on 10.14: Undefined symbols for architecture x86_64: "_aligned_alloc"

[barracuda156]

ld: warning: directory not found for option '-L/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_net_picotls/picotls/work/picotls-eb013f761bf1dc3da244322d8569f57b33a95178/)'
Undefined symbols for architecture x86_64:
  "_aligned_alloc", referenced from:
      _new_aesgcm in fusion.c.o
      _ptls_fusion_aesgcm_set_capacity in fusion.c.o
ld: symbol(s) not found for architecture x86_64

​https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/195517/steps/install-port/logs/stdio