[hughsie@hughsie-laptop gnome]$ ./waf.py build
[2/9] * intltool : ../data/gnome_test.schemas.in -> ../data/gnome_test.schemas
[3/9] * sgml2man : ../man/gnome-hello.sgml -> ../man/gnome_test.1
[9/9] * cc_link : default/src/icon.o default/src/app.o default/src/menus.o default/src/hello.o -> default/src/gnome-hello

/bin/sh: default/src/icon.o: Permission denied
ERROR:  == Runner ==  task failed! (return code 254 and task id 9)
ERROR:  == Task ==  -- begin task debugging --
ERROR:  == Task ==  action: cc_link idx: 9
ERROR:  == Task ==  [<b:/home/hughsie/user/code/waf/demos/gnome/src/icon.o>, <b:/home/hughsie/user/code/waf/demos/gnome/src/app.o>, <b:/home/hughsie/user/code/waf/demos/gnome/src/menus.o>, <b:/home/hughsie/user/code/waf/demos/gnome/src/hello.o>]
ERROR:  == Task ==  [<b:/home/hughsie/user/code/waf/demos/gnome/src/gnome-hello>]
ERROR:  == Task ==  -- end task debugging --
Compilation failed
(error raised in module Scripting)