我搞砸了我的 iPhone 项目。我跑了svn update，几个月前摆弄过存储库。此后的许多变化，使得从旧点恢复几乎是不可能的。
当我现在尝试构建项目时，我得到：
ProcessPCH /Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/PrecompiledHeaders/Event_Prefix-brpgiiwwokyynuheloumlvxlmurs/Event_Prefix.pch.pth Event_Prefix.pch normal i386 objective-c com.apple.compilers.llvm.clang.1_0.compiler
cd /Users/waterskiingmithrill/Development/iPhone/Event
setenv LANG en_US.US-ASCII
setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c-header -arch i386 -fmessage-length=0 -std=c99 -Wno-trigraphs -fpascal-strings -O0 -Wno-missing-field-initializers -Wno-missing-prototypes -Wreturn-type -Wno-implicit-atomic-properties -Wformat -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-sign-compare -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wno-undeclared-selector -Wno-deprecated-implementations -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk -fexceptions -fasm-blocks -Wprotocol -Wdeprecated-declarations -mmacosx-version-min=10.6 -g -fvisibility=hidden -Wno-conversion -Wno-sign-conversion -fobjc-abi-version=2 -fobjc-legacy-dispatch "-DIBOutlet=__attribute__((iboutlet))" "-DIBOutletCollection(ClassName)=__attribute__((iboutletcollection(ClassName)))" "-DIBAction=void)__attribute__((ibaction)" -D__IPHONE_OS_VERSION_MIN_REQUIRED=40000 -iquote "/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/Event.build/Debug-iphonesimulator/HatFair.build/Hat Fair-generated-files.hmap" "-I/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/Event.build/Debug-iphonesimulator/HatFair.build/Hat Fair-own-target-headers.hmap" "-I/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/Event.build/Debug-iphonesimulator/HatFair.build/Hat Fair-all-target-headers.hmap" -iquote "/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/Event.build/Debug-iphonesimulator/HatFair.build/Hat Fair-project-headers.hmap" -I/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Products/Debug-iphonesimulator/include -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/usr/include/libxml2 -I/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/Event.build/Debug-iphonesimulator/HatFair.build/DerivedSources/i386 -I/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/Event.build/Debug-iphonesimulator/HatFair.build/DerivedSources -F/Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Products/Debug-iphonesimulator -DNS_BLOCK_ASSERTIONS=1 --serialize-diagnostics /Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/PrecompiledHeaders/Event_Prefix-brpgiiwwokyynuheloumlvxlmurs/Event_Prefix.pch.dia -c /Users/waterskiingmithrill/Development/iPhone/Event/Event_Prefix.pch -o /Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/PrecompiledHeaders/Event_Prefix-brpgiiwwokyynuheloumlvxlmurs/Event_Prefix.pch.pth -MMD -MT dependencies -MF /Users/waterskiingmithrill/Library/Developer/Xcode/DerivedData/Event-cqyicuekijryjpbuuucigvdrxrdc/Build/Intermediates/PrecompiledHeaders/Event_Prefix-brpgiiwwokyynuheloumlvxlmurs/Event_Prefix.pch.d
clang: error: no such file or directory: '/Users/waterskiingmithrill/Development/iPhone/Event/Event_Prefix.pch'
clang: error: no input files
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1
而且我不知道为什么Event_Prefix.pch没有叮当声。（我什至不知道clang是什么）任何帮助，如何调试的建议，如何修复的提示，非常感谢。