How to build on macOS arm64?

[krlmlr]

I had to add the following to ~/.R/Makevars to be able to build locally:

CPPFLAGS = -I/opt/homebrew/include
LDFLAGS = -L/opt/homebrew/lib

Is this expected? Would it work out of the box if I installed libpng elsewhere? Should the package perhaps get an anticonf file? Can we document this better?

[DavisVaughan]

I also have this issue. I think it also occurs when installing svglite, i.e. r-lib/svglite#169 (both need libpng)

Possibly the configure script used by systemfonts can be used here too
r-lib/svglite#169 (comment)