例如，如果我有libclang 3.4并3.5安装了，我该如何切换？
aptitude search libclang
p libclang-3.3-dev - clang library - Development package
i A libclang-3.4-dev - clang library - Development package
p libclang-3.5-dev - clang library - Development package
p libclang-common-3.3-dev - clang library - Common development package
i A libclang-common-3.4-dev - clang library - Common development package
p libclang-common-3.5-dev - clang library - Common development package
i libclang-dev - clang library - Development package
p libclang1 - C, C++ and Objective-C compiler (LLVM based)
p libclang1-3.3 - C interface to the clang library
p libclang1-3.3-dbg - clang library
i A libclang1-3.4 - C interface to the clang library
p libclang1-3.4-dbg - clang library
i libclang1-3.5 - C interface to the clang library
p libclang1-3.5-dbg - clang library