cd ios; pod install fails

[maacl]

with:

Ignoring executable-hooks-1.3.2 because its extensions are not built.  Try: gem pristine executable-hooks --version 1.3.2
Ignoring ffi-1.9.6 because its extensions are not built.  Try: gem pristine ffi --version 1.9.6
Ignoring gem-wrappers-1.2.7 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.2.7
Ignoring nokogiri-1.6.6.2 because its extensions are not built.  Try: gem pristine nokogiri --version 1.6.6.2
Ignoring posix-spawn-0.3.10 because its extensions are not built.  Try: gem pristine posix-spawn --version 0.3.10
[!] No `Podfile' found in the project directory.
exit 1