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How to build a sfdx package which references the npsp - what goes into sfdx-project.json?

I am using the sfdx force:package:version:create command to attempt to create the first version of my package.
But the source code includes a reference to npsp, so I am getting an error "No such column 'npe01__SYSTEMIsIndividual__c' on entity 'Account'"

I understand that I have to add a dependency to the npsp in my sfdx-project.json file, but can someone give me an example of what to add?
Best Answer chosen by Filikin
Figured this one out - in sfdx-project.json, in the dependencies section of packageDirectories I included "subscriberPackageVersionId": "04t80000001AWvwAAG" where the 04t string is the id of the Contacts and Organisaton package, which I obtained by running 
sfdx force:package:installed:list 
I also had to create a dummy Account record type, so that record types got switched on
So my sfdx-project.json file now looks like this:
"packageDirectories": [
"path": "force-app",
"default": true,
"package": "MyPackage",
"versionName": "ver 1.5",
"versionNumber": "",
"dependencies": [
"subscriberPackageVersionId": "04t80000001AWvwAAG"
"namespace": "",
"sfdcLoginUrl": "",
"sourceApiVersion": "43.0",
"packageAliases": {
"MyPackage": "0Ho1W000000XXXXX",
"MyPackage@1.0.0-1": "04t1W000000XXXXXX",