gtkdoc-scan(1) on Linux
The text 03b7f7120ce4, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it. The page shows this text now.
Extracts declarations of functions, macros, enums, structs and unions from header files.