7
Tengo un problema cuando intento configurar Xcode. se muestra en la imagen 
Error en la instalación de Xcode 4.2.1?
Aquí es lo que está en mi archivo install.log:
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: Create temporary directory "/var/folders/_4/pnfcjvx94hbgzfgsyy387b9w0000gn/T//Install.420mLpMwf"
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: IFPKInstallElement (29 packages)
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: Using authorization level of root for IFPKInstallElement
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: Failed install preflight: Error Domain=PKInstallErrorDomain Code=102 "The package “DeveloperTools.pkg” is untrusted." UserInfo=0x7fb8526d33d0 {NSLocalizedDescription=The package “DeveloperTools.pkg” is untrusted., NSURL=../Packages/DeveloperTools.pkg -- file://localhost/Users/bashar/Desktop/Programs/Xcode%204.2.1%20iOS%205/Install%20Xcode.app/Contents/Resources/Xcode.mpkg/, PKInstallPackageIdentifier=com.apple.pkg.DeveloperToolsLeo, NSUnderlyingError=0x7fb8526b61e0 "The operation couldn’t be completed. CSSMERR_TP_CERT_EXPIRED"}
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: IFDInstallController 50D06C30 state = 7
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: Displaying 'Install Failed' UI.
Apr 1 01:29:04 Bashars-MacBook-Pro Installer[420]: 'Install Failed' UI displayed message:'An unknown installation error occurred.
The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.'.
Esta pregunta puede estar fuera de tema aquí en SO. – Till