---- WARNING ----
The following functionalities will be missing in your compilation of
Emacs because of missing development libraries (specify
-without-FEATURE to omit warning about such a missing feature):
jpeg: used for displaying jpeg image files
tiff: used for displaying tiff image files
xpm: used for displaying xpm image files and color icons
alsa: used for playing sounds from within Emacs
Including a short description of the consequences when such a
functionality is missing.
Please don't make this unnecessary verbose. I think "The following
functionalities will be missing ... displaying jpeg image files"
perfectly clear. People building complex software like emacs from
source should be able to understand this messages and its
consequences.