[MacPorts] #67659: graphviz-gui: "Port graphviz-gui requires a full Xcode installation..."

[MacPorts]

#67659: graphviz-gui: "Port graphviz-gui requires a full Xcode installation..."
---------------------------+------------------------
  Reporter:  dyne2meter    |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  graphviz-gui  |
---------------------------+------------------------

Comment (by dyne2meter):

 Then something funny is going on. I reinstalled Xcode 10.3, and got the
 same message (even after starting Xcode, agreeing, and installing
 components.

 I had to:

 xcode-select -s /Applications/Xcode.app/Contents/Developer

 to get access to the xcodebuild command, and if thereafter I do

 xcode-select --switch /Library/Developer/CommandLineTools

 I lose xcodebuild again. I understand paths and so on, but the advice I
 get from MacPorts only goes as far as issuing "xcode-select --install". I
 see that the command line tools are on another path from Xcode.app.

 Anyway, I was able to complete the installation of R-app and graphviz-gui,
 so that issue is retired. I just don't understand the additional work with
 xcode-select. Are the command line tools always available to MacPorts once
 they are installed? Thanks for any advice.

-- 
Ticket URL: <https://trac.macports.org/ticket/67659#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS