When I run ./bin/celerity map in the stable branch of phabricator, it aborts with an exception, when it reaches the sprint extension:
Rebuilding 2 resource source(s). Rebuilding resource source "phabricator" (CelerityPhabricatorResources)... Found 110 binary resources. Found 362 text resources. Found 9 packages. Writing map "resources/celerity/map.php". Rebuilding resource source "sprint" (CeleritySprintResources)... Found 5 binary resources. [2015-07-10 08:28:07] EXCEPTION: (Exception) CSS file 'phui-object-box.css' has unknown variable 'fontfamily'. at [<phabricator>/src/applications/celerity/CelerityResourceTransformer.php:334] arcanist(head=stable, ref.master=999eb9376568, ref.stable=d54cb072facd), libphremoteuser(head=master, ref.master=1def4e2d7f07), phabricator(head=stable, ref.master=f0bf7a8e2621, ref.stable=2e82fb07cdc1), phutil(head=stable, ref.master=aa6cd8f7e5e5, ref.stable=83f09f6c5a03), sprint(head=production, ref.master=4912ecf41ef1, ref.production=13c2949b3777) #0 CelerityResourceTransformer::replaceCSSVariable(array) #1 preg_replace_callback(string, array, string) called at [<phabricator>/src/applications/celerity/CelerityResourceTransformer.php:161] #2 CelerityResourceTransformer::replaceCSSVariables(string, string) called at [<phabricator>/src/applications/celerity/CelerityResourceTransformer.php:44] #3 CelerityResourceTransformer::transformResource(string, string) called at [<phabricator>/src/applications/celerity/CelerityResourceMapGenerator.php:186] #4 CelerityResourceMapGenerator::rebuildTextResources(CeleritySprintResources, CelerityResourceTransformer) called at [<phabricator>/src/applications/celerity/CelerityResourceMapGenerator.php:54] #5 CelerityResourceMapGenerator::generate() called at [<phabricator>/src/applications/celerity/management/CelerityManagementMapWorkflow.php:47] #6 CelerityManagementMapWorkflow::rebuildResources(CeleritySprintResources) called at [<phabricator>/src/applications/celerity/management/CelerityManagementMapWorkflow.php:24] #7 CelerityManagementMapWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:406] #8 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:301] #9 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/setup/manage_celerity.php:21]