[MacPorts] Migration modified

[MacPorts]

Page "Migration" was changed by larryv at macports.org
Diff URL: <https://trac.macports.org/wiki/Migration?action=diff&version=75>
Revision 75
Comment: rewrite opening paragraph
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Index: Migration
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--- Migration (version: 74)
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 == Migrating a MacPorts install to a new major OS version or CPU architecture ==
 
-An installation of MacPorts and the ports installed by it are only designed to work on a single OS release and a single CPU architecture. If you upgrade to a new OS version (e.g. from Leopard to Snow Leopard) or migrate to a new machine with a different type of CPU (e.g. PowerPC to Intel), you may get lucky and have your ports keep working, but in general, things will break.
-If you are only upgrading Xcode (e.g. 4.1 to 4.2 on Lion) but not the major OS version or CPU architecture, you do not need to reinstall ports as described below.
+A MacPorts installation is designed to work with a particular operating
+system and a particular hardware architecture. Upgrading the operating
+system (e.g., from Mavericks to Yosemite) or migrating to a new machine
+with a different architecture (e.g., from PowerPC to Intel) will
+generally cause problems. The following procedure is designed to prevent
+such problems.
+
+(The procedure is not necessary after Xcode upgrades unless one of the
+scenarios listed above also applies.)
+
 
 === Migration procedure ===
 
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Page URL: <https://trac.macports.org/wiki/Migration>
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