Bug invoked during RST installation on macOS (Ventura 13.2.1)

[hjli1]

A bug invoked in process of make.code when aacgm module are compiled:
"
make.version /Users/huijunli/Tools/Python/rst/codebase/analysis/src.lib/aacgm/aacgm.1.15/src/..
make.hdr /Users/huijunli/Tools/Python/rst/codebase/analysis/src.lib/aacgm/aacgm.1.15/src/../include /Users/huijunli/Tools/Python/rst/include/analysis
/Users/huijunli/Tools/Python/rst/codebase/analysis/src.lib/aacgm/aacgm.1.15/src/../include/aacgm.h
/Users/huijunli/Tools/Python/rst/codebase/analysis/src.lib/aacgm/aacgm.1.15/src/../include/aacgm.h -> /Users/huijunli/Tools/Python/rst/include/analysis/aacgm.h
cc -Wall -pedantic -O3 -D_GNU_SOURCE -D_DARWIN -I/opt/local/include -I/Users/huijunli/Tools/Python/rst/include/base -I/Users/huijunli/Tools/Python/rst/include/general -c math.c
math.c:45:33: error: implicitly declaring library function 'floor' with type 'double (double)' [-Werror,-Wimplicit-function-declaration]
if (quotient >= 0) quotient = floor(quotient);
^
math.c:45:33: note: include the header <math.h> or explicitly provide a declaration for 'floor'
"

What's wrong with it?