I have macOS Mojave version 10.14.5 installed with Xcode version 10.2.1 and Command Line Tools installed using xcode-select -install. All problem started when I tried to install youtube-dl formula. Xcode 5.1 and OSX 10.9. (also works with Xcode 5.1.1 + OSX 10.10) xcode-select -install worked with version 2333, failed with version 2003. So, try xcode-select -install and if that does not work download as described below. In early February 2014 xcode-select -install has been reporting that 'Can't install the software because it is not currently available from the Software Update server'. The Xcode IDE supports both of these SCM systems directly within the IDE, and makes them available from the command line. These include all of the most popular command line tools such as make, awk, sed, ssh, tar, and zip. The editors in macOS include TextEdit, xed (the Xcode editor), plus vim and emacs. You can download the Xcode command-line tools in either of two ways: To install the necessary Xcode tools using Xcode on the Mac: Start Xcode on the Mac.

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So I went to get updates from the App Store today and saw that Xcode 8 was available for my mid-2007 aluminum iMac running OS X v10.11.6 'El Capitan.' I had a little trouble getting it to finish downloading and installing (probably since it's such a big download — I've had problmes like this before,) but I did finally manage to get it do that! In any case, once I was done doing that, I expected to find myself able to download and install the corresponding command line tools package update even though it didn't appear when I first checked for updates. And, yet, for some strange reason, the expected update in question still hasn't appeared! I also checked Apple Developer Connection's manual 'Downloads for Apple Developers' page, but the El Capitan command-line tools installer wasn't listed there, either! To make matters even more confusing, I did see the macOS Sierra (10.12) command-line tools installer listed there! What in the heck is going on here?!? I need the command-line tools to continue using Homebrew in --build-from-source mode!

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