Update to waf 1.6.10, the latest version. From the upstream changelog:

• Fixed the 'remove' attribute propagation in ant_glob #1086
• Fixed the behavior of recurse(name=xyz) when traversing existing folders
• Fixed a problem with include paths in the relocation tool #1078
• Improved the pgicc compiler detection #1080
• Fixed the behavior of 'waf options' #1076
• Fixed the large java project processing #1074
• Removed the ':' from the drives when dealing with foreign files and folders on Win32
• Let the 'subst' feature process a chmod attribute
• Added a hook for distutils variable query #108