You should specify where you store your private TeX macros, so
AUCTeX can extract their information. The extracted information will
go to the directories listed in TeX-auto-private
Use M-x TeX-auto-generate to extract the information.
Directories where you store your personal TeX macros. Each must end with a slash.
This defaults to the directories listed in the TEXINPUTS and BIBINPUTS environment variables.
List of directories containing automatically generated information. Must end with a slash.
These correspond to the personal TeX macros.