postmaster became multithreaded during startup

Hi, all,

I am experiencing a startup failure on OS X 10.11.3, with PostgreSQL =
9.5.1 that I installed using Homebrew.

Here's the full error:

$ postgres -d 5 -D db
DEBUG:  postgres: PostmasterMain: initial environment dump:
DEBUG:  -----------------------------------------
DEBUG:      TERM_PROGRAM=3DiTerm.app
DEBUG:      SHELL=3D/bin/bash
DEBUG:      TERM=3Dxterm-256color
DEBUG:      TMPDIR=3D/var/folders/3r/vzj1r6_918qghdqk517g55bcg3gy47/T/=

DEBUG:      =
Apple_PubSub_Socket_Render=3D/private/tmp/com.apple.launchd.39PGlvUVAG/Ren=
der
DEBUG:      USER=3Dpmw
DEBUG:      =
SSH_AUTH_SOCK=3D/private/tmp/com.apple.launchd.QFbewTSIsA/Listeners
DEBUG:      __CF_USER_TEXT_ENCODING=3D0x1E37F887:0x0:0x0
DEBUG:      =
PATH=3D/Users/pmw/.rbenv/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
DEBUG:      PWD=3D/Users/pmw/my-data
DEBUG:      =
JAVA_HOME=3D/Library/Java/JavaVirtualMachines/jdk1.8.0_74.jdk/Contents/Hom=
e
DEBUG:      LANG=3Den_US.UTF-8
DEBUG:      MEMDEF_POLICY=3DCCCCCCCCCCCCCAAAAAAAACC:C
DEBUG:      ITERM_PROFILE=3DDefault
DEBUG:      XPC_FLAGS=3D0x0
DEBUG:      XPC_SERVICE_NAME=3D0
DEBUG:      SHLVL=3D1
DEBUG:      COLORFGBG=3D7;0
DEBUG:      HOME=3D/Users/pmw
DEBUG:      ITERM_SESSION_ID=3Dw0t0p0
DEBUG:      LOGNAME=3Dpmw
DEBUG:      _=3D/usr/local/bin/postgres
DEBUG:      OLDPWD=3D/Users/pmw
DEBUG:      PGSYSCONFDIR=3D/usr/local/etc/postgresql
DEBUG:      LC_COLLATE=3Den_US.UTF-8
DEBUG:      LC_CTYPE=3Den_US.UTF-8
DEBUG:      LC_MESSAGES=3Den_US.UTF-8
DEBUG:      LC_MONETARY=3DC
DEBUG:      LC_NUMERIC=3DC
DEBUG:      LC_TIME=3DC
DEBUG:  -----------------------------------------
DEBUG:  invoking IpcMemoryCreate(size=3D148488192)
DEBUG:  SlruScanDirectory invoking callback on pg_notify/0000
DEBUG:  removing file "pg_notify/0000"
DEBUG:  dynamic shared memory system will support 288 segments
DEBUG:  created dynamic shared memory control segment 1804289383 (2316 =
bytes)
DEBUG:  max_safe_fds =3D 982, usable_fds =3D 1000, already_open =3D 8
FATAL:  postmaster became multithreaded during startup
HINT:  Set the LC_ALL environment variable to a valid locale.
DEBUG:  shmem_exit(1): 0 before_shmem_exit callbacks to make
DEBUG:  shmem_exit(1): 4 on_shmem_exit callbacks to make
DEBUG:  cleaning up dynamic shared memory control segment with ID =
1804289383
DEBUG:  proc_exit(1): 2 callbacks to make
DEBUG:  exit(1)
DEBUG:  shmem_exit(-1): 0 before_shmem_exit callbacks to make
DEBUG:  shmem_exit(-1): 0 on_shmem_exit callbacks to make
DEBUG:  proc_exit(-1): 0 callbacks to make

$ locale
LANG=3D"en_US.UTF-8"
LC_COLLATE=3D"en_US.UTF-8"
LC_CTYPE=3D"en_US.UTF-8"
LC_MESSAGES=3D"en_US.UTF-8"
LC_MONETARY=3D"en_US.UTF-8"
LC_NUMERIC=3D"en_US.UTF-8"
LC_TIME=3D"en_US.UTF-8"
LC_ALL=3D"en_US.UTF-8"

Now that my LC_* variables are correct, I am stumped. Any ideas?

--=20
Philip=