Installing techchart on Apple M1

[landeisbm]

When I attempt to install the techchart package:

     devtools::install_github("prodipta/techchart")

I get the following error:

cpttrend.cpp:142:27: error: use of undeclared identifier 'PI'
ret = double(n)/2log(2PI) + double(n)/2*log(variance) + double(n)/2;
^
1 error generated.
make: *** [cpttrend.o] Error 1
ERROR: compilation failed for package ‘techchart’

• removing ‘/Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library/techchart’
  Warning message:
  In i.p(...) :
  installation of package ‘/var/folders/63/lk4ndx6970n0_rxljsq33h6r0000gn/T//Rtmpb6KeH3/file5a5d2facc815/techchart_0.1.0.tar.gz’ had non-zero exit status

Thank you for any help you can give