I pulled the latest version of three20 from github and installed their template. I opened it up in XCode, built it, ran it, then I realized the template isn't iOS4 ready.
The first issue I found was "Base SDK not found". I solved it in Edit Project Setting by changing the Base SDK to "iOS Device 4.1".
Then I ran it again. I got tons of errors related to "Three20/Three.h: No such file or directory". I added the "../three20/src" to my Header Search Paths but it doesn't help.
Does anyone know why? What else should I change?
FYI:
XCode Version 3.2.4
Latest version of three20 (29 September)
Directories:
xcode/myproject/
xcode/three20/
PS: the template works fine in SDK 3.0
Turn out I have to use http://github.com/ECP/three20 instead .