My R version was 4.2.0, When I run devtools::install_github("robjhyndman/forecast") in macOS Big Sur 11.2,I got the error as follow.
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:324:9: error: no member named 'isinf' in the global namespace
using ::isinf;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:325:9: error: no member named 'isnan' in the global namespace
using ::isnan;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:326:9: error: no member named 'isnormal' in the global namespace
using ::isnormal;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:327:9: error: no member named 'isgreater' in the global namespace
using ::isgreater;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:328:9: error: no member named 'isgreaterequal' in the global namespace
using ::isgreaterequal;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:329:9: error: no member named 'isless' in the global namespace
using ::isless;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:330:9: error: no member named 'islessequal' in the global namespace
using ::islessequal;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:331:9: error: no member named 'islessgreater' in the global namespace
using ::islessgreater;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:332:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
~~^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:333:9: error: no member named 'isunordered' in the global namespace
using ::isunordered;
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:645:18: error: no template named 'numeric_limits'
int _Bits = (numeric_limits<_IntT>::digits - numeric_limits<_FloatT>::digits)>
^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:645:50: error: no template named 'numeric_limits'
int _Bits = (numeric_limits<_IntT>::digits - numeric_limits<_FloatT>::digits)>
^
>/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/cmath:650:17: error: no template named 'numeric_limits'
static_assert(numeric_limits<_FloatT>::radix == 2, "FloatT has incorrect radix");
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [calcBATS.o] Error 1
ERROR: compilation failed for package ‘forecast’
* removing ‘/Users/biofly/Library/R/x86_64/4.2/library/forecast’
The error suggested that the C++ don't work,and I thought that there may be a problem with gcc or gfortran