Either the build.properties file has incorrect filenames or the .project file has the wrong name importing the project!
On my mac (which IS case sensitive btw), I import head/root/projects/web-service-client using svn import pluging from subclipse and it wants to call my project (and subsequently the folder that the project is stored) "Web Service Client". In the HEAD/root/build.properties file its referenced for ant as web-service-client. there are others like this.
I found its better to leave the defaults for the project names/folders but to then modify the build.xml file at HEAD/root/.
if thats right then maybe an update to the wiki would be OK?