[semi-OT] dependencies libraries

["Andrea Zagli" <azagli inwind it>]

how can i do to know the exact libraries versions which my  
applications depends on?

for example: if i develop with gtk 2.12 (but i can do the same  
reasoning with any other library) how can i do to know if i used (or  
not) new functions/classes introduced on that version? (of course  
without look inside library documentation for every function/class  
that i used)

thanks