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Small update.
In making this work, you may find it valuable to open the project bundle (directory, not a file) in BBEdit, then open the project.pbxproj inside and look for where Xcode is putting the reference to your "Custom Location".
My custom location is named $C0re so it is easy to find.
I found it very handy to be able to delete any line with the Custom Location generated into it by Xcode to force Xcode to update and to clean up the GUI mistakes in generating the lines in the project.pbxproj file.
There is some kind of caching going on and you may not see the change you apply via Xcode to the "System Header Search Paths" in the actual file showing simultaneously in BBEdit until you command-s the project files in Xcode. You would think that quitting Xcode would commit the changes to the project file but it did not seem to do so sometimes. (Xcode's caching system is problematic at best)
It took a couple of hours but now I am able to use
#include <C0re/C0reTypes.h>
in my project. Again so glad we advanced past that primitive old drag and drop thing 🙄
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The best way in Xcode to do this is: (using your example)
Open Preferences
Click "Locations" then the "Custom Paths" tab
Click the "+" sign at the bottom left
enter "gst" as the "Name" (no quotes)
enter "GST Headers" as the "Display Name" (no quotes)
enter the path name* to your gst folder as the "Path"
In the Finder, right-click / option click / two-finger click the "GST" folder, then hold the option and you will see "Copy" change to "Copy GST as Pathname". Do that and use paste it in for step 6
Ok no you have the first part. You created an Xcode system variable. The next part is to reference the Xcode variable in your project build settings by:
Open the project
Click on the folder button under the window close button
Click on the blue project button/icon under the folder button
In the column that appears to the right, click on another blue project button/icon
In the row of tabs/buttons slightly higher and to the right, click on the "Build Settings" button/tab
in the "Filter" text entry slightly lower than the tabs to the far right, enter "Search" without quotes
below you should see "Search Paths" with a chevron, click the chevron if it is pointed at the word "Search" and it opens up the options
below "Search Paths" you should see "System Header Search Paths". again click the chevron if it is pointed at the word "Search" and it opens up the options
Hover over the word "Debug" below "System Header Search Paths" and a grey "+" button thing will show to the right, click the "+" button
"Any Architecture/Any SDK" will appear and your cursor will be in a text entry. Type "$gst" without quotes
Hover over the word "Release" below "Debug" and a grey "+" button thing will show to the right, click the "+" button
"Any Architecture/Any SDK" will appear and your cursor will be in a text entry. Type "$gst" without quotes
Now you should be able to put...
#include <gst/gst.h>
or maybe
#include <gst.h>
... in your code and have it compile.
Unfortunately Xcode has some problems with the basics of what an IDE should do so you may have to fiddle with the pathname vs what you put between the <>. Be aware that you also may need to close all projects and quit between edits of the "System Header Search Paths" and the "Custom Paths" to get Xcode to recognize changes. You may also have to delete the "Custom Paths" and re-enter it to get Xcode to recognize changes.
Isn't that easier than it was in 1991 with drag and drop of a folder into "system headers" and "project headers" in CodeWarrior and MPW? </sarcasm mode>
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iPad 12.9" 3rd gen. iPad OS 16.2. Connecting iMac 24" M1 to iPad triggers no "trust this computer" dialog. Connection cable is a Thunderbolt 4 cable. As it turns out, I see that there is no "Developer Mode" in Settings -> Privacy & Security -> Developer Mode (at the bottom on right). This is presumably because of a corporate MDM setting (unconfirmed) removing the ability to get into Developer Mode. Your mileage may vary. Developer Mode: https://developer.apple.com/documentation/xcode/enabling-developer-mode-on-a-device
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Having same issue with macOS 11. Tried to remove profile, no joy.
Signed out and in to App Store, no joy.
Reinstalled macOS 11 "release", no joy
cleared every cache folder and file I could find (OMG cleaned a lot of macOS cache corruption), no joy
(now random cleaning) rebuilt Launch Services, no joy
Tried to update Locate database, no joy
Tried to update WhatIs database, no joy
tried sudo softwareupdate --clear-catalog, "Catalog management is no longer supported.", no joy
sacrificed a chicken, paprikash!😋, Mac still no joy
Going to turn off SIP next and re-run cleaning so my old utils can clean out what Apple thinks is bug free Apple stuff. Clearly it ain't bug free. Chicken Kiev next.
