[Chicken-janitors] #1053: Support newer Xcode versions on Mac

[Chicken Trac]

#1053: Support newer Xcode versions on Mac
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 Reporter:  felix         |       Owner:         
     Type:  defect        |      Status:  new    
 Priority:  major         |   Milestone:  someday
Component:  build system  |     Version:  4.8.x  
 Keywords:                |  
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 in Xcode 4 and 5 the development tools are now all located under the
 `Applications/Xcode.app` directory (by default). It should be possible to
 check this and setup all paths automatically without requiring the user to
 modify the PATH.

 Note that the paths changed between Xcode 4 and 5 (of course).

 Additionally `-isysroot` options have to be set when running the compiler.
 This is particularly important when you want to build for iOS (either the
 simulator or the device).

 Attached are two patches that extend the build-system and some scripts
 that try to figure out the correct location of Xcode. Note that this
 hasn't been adapted to Xcode 5 yet (but I can assist if someone is
 interested).

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Ticket URL: <http://bugs.call-cc.org/ticket/1053>
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