Panic: exec: "pkg-config": executable file not found in $PATH

I’m working through the installation path, and getting an error. I assume this is some sort of dependency issue, but I can’t figure out what it might be. I also found this GH ticket, but it was closed without resolution.

Any ideas what is going wrong?
Mac, go, GCC, and Rust are installed

matt@UNKNOWN filecoin-project % make deps
go run ./build/*.go smartdeps
pkg-config --version
panic: exec: "pkg-config": executable file not found in $PATH

goroutine 1 [running]:
main.runCmd(0x1491e17, 0x2, 0xc000067140, 0x1, 0x1)
	/Users/matt/filecoin-project/build/main.go:93 +0x4ef
main.deps()
	/Users/matt/filecoin-project/build/main.go:117 +0xdb
main.main()
	/Users/matt/filecoin-project/build/main.go:334 +0x1cd
exit status 2
make: *** [deps] Error 1

I think GCC is installed
matt@UNKNOWN filecoin-project % gcc --version

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1

Apple clang version 11.0.3 (clang-1103.0.32.29)

Target: x86_64-apple-darwin19.3.0

Thread model: posix

InstalledDir: /Library/Developer/CommandLineTools/usr/bin