`make deploy` is failing on macOS #17528

<!-- Describe the issue -->

Running make deploy on macOS fails as shown:

❯ make deploy
Making all in src
Making all in doc/man
make[1]: Nothing to be done for `all'.
make[1]: Nothing to be done for `all-am'.
build-aux/install-sh -c -d Bitcoin-Qt.app/Contents/MacOS
STRIPPROG="/usr/bin/strip" /bin/sh /Users/mk/Code/github/bitcoin/bitcoin/build-aux/install-sh -c -s  ./src/qt/bitcoin-qt Bitcoin-Qt.app/Contents/MacOS/Bitcoin-Qt
sed 's/PACKAGE_NAME/Bitcoin Core/' < "contrib/macdeploy/background.svg" | rsvg-convert -f png -d 36 -p 36 -o background.tiff.png
/bin/sh: rsvg-convert: command not found
make: *** [background.tiff.png] Error 127

Expected behavior

I expect it to succeed.

Actual behavior

It succeeded the first time, and I was able to start the app by running ./src/qt/bitcoin-qt, but after I did CTRL+C to quit the process and ran make deploy again, it failed and it keeps failing.

I looked at the suggested solutions in #8120. I tried running make deploy after doing git clean -dxf, after restarting my machine, and after deleting /Applications/Bitcoin-Qt.app. It still failed.

To reproduce

1. Using macOS, run make deploy
2. Once finished, run ./src/qt/bitcoin-qt
3. CTRL+C to quit bitcoin-qt process
4. Run make deploy again

System information

I tried this on master branch, commit 30521302f90e4856a7516867b32a4576fa6d98b3 using a macOS 10.14.6 (Mojave)

Install librsvg, as it says to do in the macOS build docs if you want to use make deploy.

@fanquake Oh, my bad! I missed that step. I installed librsvg and it works now!