# Changes

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Attention: [[generate_XDS.INP]] requires the [https://developer.apple.com/download/more/ Xcode command line tools] to be installed (free of charge): open a Terminal window, and enter <code>sudo xcode-select --install</code> (for Big Sur, the download has a size of about half a GB; the downloader is much too pessimistic about the time it takes).

Attention: [[generate_XDS.INP]] requires the [https://developer.apple.com/download/more/ Xcode command line tools] to be installed (free of charge): open a Terminal window, and enter <code>sudo xcode-select --install</code> (for Big Sur, the download has a size of about half a GB; the downloader is much too pessimistic about the time it takes).
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Although CCP4 is not required by XDS itself, some of the programs (XDSSTAT, and MTZ file creation in XDSCONV) use CCP4 tools or libraries. Therefore, CCP4 should be installed. Open a Terminal and check the existence of the file .zprofile , and its content:<pre>
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kay@Kays-MacBook-Air-2018 ~ % ls -l .zprofile
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-rw-r--r--  1 kay  staff  107  7 Mär 09:41 .zprofile
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kay@Kays-MacBook-Air-2018 ~ % cat .zprofile
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source /Users/kay/.profile
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# Added by CCP4 package manager:
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. '/Applications/ccp4-7.1/bin/ccp4.setup-sh'
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</pre>If the file does not exist, create it with the contents indicated above; you have to adapt it to your user name and the CCP4 version.

Become familiar with the concept and ways to run commands as "root" - google "mac osx become root". All the installation tasks that are run in a Terminal window require root privileges, since some of the programs and their links are written to /usr/local/bin. (As an alternative that does not require root for installation, one may create a directory $HOME/bin and use that for the programs and links. That would also require modification of the$PATH, by a one-time <code>echo 'export PATH=$PATH:$HOME/bin' >> ~/.profile</code>)

Become familiar with the concept and ways to run commands as "root" - google "mac osx become root". All the installation tasks that are run in a Terminal window require root privileges, since some of the programs and their links are written to /usr/local/bin. (As an alternative that does not require root for installation, one may create a directory $HOME/bin and use that for the programs and links. That would also require modification of the$PATH, by a one-time <code>echo 'export PATH=$PATH:$HOME/bin' >> ~/.profile</code>)
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