Otherwise, almost all API functions are not extracted.
# Extra options to supply to gtkdoc-scan.
# e.g. SCAN_OPTIONS=--deprecated-guards="GTK_DISABLE_DEPRECATED"
-SCAN_OPTIONS=--rebuild-types --deprecated-guards="HB_DISABLE_DEPRECATED"
+SCAN_OPTIONS=--rebuild-types --deprecated-guards="HB_DISABLE_DEPRECATED" \
+ --ignore-decorators="HB_EXTERN"
# Header files or dirs to ignore when scanning. Use base file/dir names
# e.g. IGNORE_HFILES=gtkdebug.h gtkintl.h private_code