allbulletdemosOSX and creating from scratch proj difference

[sefiroths]

i have readed Creating a project from scratch with xcode
and i have this errors
build errors:
"btTypedConstraint::serialize(void*, btSerializer*) const", referenced from:
"btAlignedFreeInternal(void*)", referenced from:
as suggested i have to compile framework with cmake ecc...

why allbulletdemosOSX works without installing lib,
but creating from scratch with xcode needs building framework with cmake...?
some settings?
thanks