rofi fails after complaint: xkbcommon: ERROR: couldn't find a Compose file for locale "en_US.utf8" #400

I build the latest version with all debian packages from the latest debian stable except xkbcommon,
which wasn't new enough. Install went fine. Scary warning at run time:

$ echo -e "foo\nbar\n" | rofi -dmenu
xkbcommon: ERROR: couldn't find a Compose file for locale "en_US.utf8"
Failed to get keyboard compose table. Trying to limp on.
bar
$

Requested version etc. follows:

Version

$ rofi -v
Version: 1.0.1

Configuration

$ rofi -dump-xresources
xkbcommon: ERROR: couldn't find a Compose file for locale "en_US.utf8"
Failed to get keyboard compose table. Trying to limp on.
! Enabled modi
rofi.modi: window,run,ssh
! Window opacity
rofi.opacity: 100
! Window width
rofi.width: 50
! Number of lines
rofi.lines: 15
! Number of columns
rofi.columns: 1
! Font to use
rofi.font: mono 12
! Color scheme for normal row
rofi.color-normal: #fdf6e3,#002b36,#eee8d5,#586e75,#eee8d5
! Color scheme for urgent row
rofi.color-urgent: #fdf6e3,#dc322f,#eee8d5,#dc322f,#fdf6e3
! Color scheme for active row
rofi.color-active: #fdf6e3,#268bd2,#eee8d5,#268bd2,#fdf6e3
! Color scheme window
rofi.color-window: #fdf6e3,#002b36
! Border width
rofi.bw: 1
! Location on screen
rofi.location: 0
! Padding
rofi.padding: 5
! Y-offset relative to location
rofi.yoffset: 0
! X-offset relative to location
rofi.xoffset: 0
! Always show number of lines
rofi.fixed-num-lines: false
! Terminal to use
rofi.terminal: rofi-sensible-terminal
! Ssh client to use
rofi.ssh-client: ssh
! Ssh command to execute
rofi.ssh-command: {terminal} -e {ssh-client} {host}
! Run command to execute
rofi.run-command: {cmd}
! Command to get extra run targets
rofi.run-list-command:
! Run command to execute that runs in shell
rofi.run-shell-command: {terminal} -e {cmd}
! Disable history in run/ssh
rofi.disable-history: false
! Use levenshtein sorting
rofi.levenshtein-sort: false
! Set case-sensitivity
rofi.case-sensitive: false
! Enable sidebar-mode
rofi.sidebar-mode: false
! Row height (in chars)
rofi.eh: 1
! Enable auto select mode
rofi.auto-select: false
! Parse hosts file for ssh mode
rofi.parse-hosts: false
! Parse known_hosts file for ssh mode
rofi.parse-known-hosts: true
! Set the modi to combine in combi mode
rofi.combi-modi: window,run
! Do a more fuzzy matching
rofi.fuzzy: false
! Use glob matching
rofi.glob: false
! Use regex matching
rofi.regex: false
! Tokenize input string
rofi.tokenize: true
! Monitor id to show on
rofi.m: -1
! Margin between rows
rofi.line-margin: 2
! Pre-set filter
rofi.filter:
! Separator style (none, dash, solid)
rofi.separator-style: dash
! Hide scroll-bar
rofi.hide-scrollbar: false
! Fullscreen
rofi.fullscreen: false
! Fake transparency
rofi.fake-transparency: false
! DPI
rofi.dpi: -1
! Threads to use for string matching
rofi.threads: 1
! Scrollbar width
rofi.scrollbar-width: 8
! Scrolling method. (0: Page, 1: Centered)
rofi.scroll-method: 0
! Pidfile location
rofi.pid: /run/user/1001/rofi.pid
! Keybinding
rofi.kb-primary-paste: Control+Shift+v,Shift+Insert
! Keybinding
rofi.kb-secondary-paste: Control+v,Insert
! Keybinding
rofi.kb-clear-line: Control+u
! Keybinding
rofi.kb-move-front: Control+a
! Keybinding
rofi.kb-move-end: Control+e
! Keybinding
rofi.kb-move-word-back: Alt+b
! Keybinding
rofi.kb-move-word-forward: Alt+f
! Keybinding
rofi.kb-move-char-back: Left,Control+b
! Keybinding
rofi.kb-move-char-forward: Right,Control+f
! Keybinding
rofi.kb-remove-word-back: Control+Alt+h
! Keybinding
rofi.kb-remove-word-forward: Control+Alt+d
! Keybinding
rofi.kb-remove-char-forward: Delete,Control+d
! Keybinding
rofi.kb-remove-char-back: BackSpace,Control+h
! Keybinding
rofi.kb-accept-entry: Control+j,Control+m,Return,KP_Enter
! Keybinding
rofi.kb-accept-custom: Control+Return,Shift+Return
! Keybinding
rofi.kb-mode-next: Shift+Right,Control+Tab
! Keybinding
rofi.kb-mode-previous: Shift+Left,Control+Shift+Tab
! Keybinding
rofi.kb-toggle-case-sensitivity: grave,dead_grave
! Keybinding
rofi.kb-delete-entry: Shift+Delete
! Keybinding
rofi.kb-row-left: Control+Page_Up
! Keybinding
rofi.kb-row-right: Control+Page_Down
! Keybinding
rofi.kb-row-up: Up,Control+p,Shift+Tab,Shift+ISO_Left_Tab
! Keybinding
rofi.kb-row-down: Down,Control+n
! Keybinding
rofi.kb-row-tab: Tab
! Keybinding
rofi.kb-page-prev: Page_Up
! Keybinding
rofi.kb-page-next: Page_Down
! Keybinding
rofi.kb-row-first: Home,KP_Home
! Keybinding
rofi.kb-row-last: End,KP_End
! Keybinding
rofi.kb-row-select: Control+space
! Keybinding
rofi.kb-cancel: Escape,Control+bracketleft
! Keybinding
rofi.kb-custom-1: Alt+1
! Keybinding
rofi.kb-custom-2: Alt+2
! Keybinding
rofi.kb-custom-3: Alt+3
! Keybinding
rofi.kb-custom-4: Alt+4
! Keybinding
rofi.kb-custom-5: Alt+5
! Keybinding
rofi.kb-custom-6: Alt+6
! Keybinding
rofi.kb-custom-7: Alt+7
! Keybinding
rofi.kb-custom-8: Alt+8
! Keybinding
rofi.kb-custom-9: Alt+9
! Keybinding
rofi.kb-custom-10: Alt+0
! Keybinding
rofi.kb-custom-11: Alt+Shift+1
! Keybinding
rofi.kb-custom-12: Alt+Shift+2
! Keybinding
rofi.kb-custom-13: Alt+Shift+3
! Keybinding
rofi.kb-custom-14: Alt+Shift+4
! Keybinding
rofi.kb-custom-15: Alt+Shift+5
! Keybinding
rofi.kb-custom-16: Alt+Shift+6
! Keybinding
rofi.kb-custom-18: Alt+Shift+8
! Keybinding
rofi.kb-custom-17: Alt+Shift+7
! Keybinding
rofi.kb-custom-19: Alt+Shift+9
! Keybinding
rofi.kb-screenshot: Alt+Shift+S
! Keybinding
rofi.kb-toggle-sort: Alt+grave
! The display name of this browser
rofi.display-ssh: (ssh)
! The display name of this browser
rofi.display-run: (run)
! The display name of this browser
rofi.display-drun: (drun)
! The display name of this browser
rofi.display-window: (window)
! The display name of this browser
rofi.display-windowcd: (windowcd)
! The display name of this browser
rofi.display-combi: (combi)
$

Launch Command

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Steps to reproduce

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What behaviour you see

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What behaviour you expect to see

Not the scary warning