You can use a cross-project link, as in posts, but this has a few recessions.
, Xcode ( iPhone), .
~/Library/MyLibraries/, .a . , :
~/Library/MyLibraries/
/MyLib-1.0.0/Headers/header1.h
/header2.h
/libmylib.a
/libmylib_debug.a
/MyOtherLib-2.1.0/Headers/...
/libmyotherlib.a
Xcode :
LIBRARIES_DIR $(USER_LIBRARY_DIR)/MyLibraries
MYLIBRARY_LIBROOT $(LIBRARIES_DIR)/MyLib-1.0.0
HEADER_SEARCH_PATHS $(MYLIBRARY_LIBROOT)/Headers
OTHER_LDFLAGS $(MYLIBRARY_LIBROOT)/libmylib.a
MYLIBRARY_LIBROOT, . .
, HEADER_SEARCH_PATHS OTHER_LDFLAGS.