Listing of /lib/include/pgsql/internal/ (upload file) (DB interaction files in red)
 (gzip & download folder) (chmod folder to 777) (these rarely work)
.
..
libpq
libpq-int.h|Download||Edit||Delete| 
c.h|Download||Edit||Delete| 
pqexpbuffer.h|Download||Edit||Delete| 
postgres_fe.h|Download||Edit||Delete| 
port.h|Download||Edit||Delete|