See the build log
I've got this error:
Waf: Entering directory `/var/tmp/fst/src/postler-0.1.1/_build_'
[ 1/44] valac: postler/dexter.vala postler/dockmanager.vala postler/elementary-entry.vala postler/postler-accounts.vala postler/postler-accountsetup.vala postler/postler-app.vala postler/postler-attachments.vala postler/postler-bureau.vala postler/postler-cellrenderertoggle.vala postler/postler-client.vala postler/postler-composer.vala postler/postler-content.vala postler/postler-flowbox.vala postler/postler-folders.vala postler/postler-messages.vala postler/postler-reader.vala postler/postler-recipiententry.vala postler/postler-scrolled.vala postler/postler-service.vala postler/postler-shortcuts.vala postler/postler-state.vala postler/postler-viewer.vala -> _build_/default/postler/dexter.c _build_/default/postler/dockmanager.c _build_/default/postler/elementary-entry.c _build_/default/postler/postler-accounts.c _build_/default/postler/postler-accountsetup.c _build_/default/postler/postler-app.c _build_/default/postler/postler-attachments.c _build_/default/postler/postler-bureau.c _build_/default/postler/postler-cellrenderertoggle.c _build_/default/postler/postler-client.c _build_/default/postler/postler-composer.c _build_/default/postler/postler-content.c _build_/default/postler/postler-flowbox.c _build_/default/postler/postler-folders.c _build_/default/postler/postler-messages.c _build_/default/postler/postler-reader.c _build_/default/postler/postler-recipiententry.c _build_/default/postler/postler-scrolled.c _build_/default/postler/postler-service.c _build_/default/postler/postler-shortcuts.c _build_/default/postler/postler-state.c _build_/default/postler/postler-viewer.c
../postler/postler-accounts.vala:69.44-69.44: error: Value must be constant
Waf: Leaving directory `/var/tmp/fst/src/postler-0.1.1/_build_'
Build failed: -> task failed (err #1):
{task: valac_task dexter.vala,dockmanager.vala,elementary-entry.vala,postler-accounts.vala,postler-accountsetup.vala,postler-app.vala,postler-attachments.vala,postler-bureau.vala,postler-cellrenderertoggle.vala,postler-client.vala,postler-composer.vala,postler-content.vala,postler-flowbox.vala,postler-folders.vala,postler-messages.vala,postler-reader.vala,postler-recipiententry.vala,postler-scrolled.vala,postler-service.vala,postler-shortcuts.vala,postler-state.vala,postler-viewer.vala -> dexter.c,dockmanager.c,elementary-entry.c,postler-accounts.c,postler-accountsetup.c,postler-app.c,postler-attachments.c,postler-bureau.c,postler-cellrenderertoggle.c,postler-client.c,postler-composer.c,postler-content.c,postler-flowbox.c,postler-folders.c,postler-messages.c,postler-reader.c,postler-recipiententry.c,postler-scrolled.c,postler-service.c,postler-shortcuts.c,postler-state.c,postler-viewer.c}
