error when including math.h on i586-pc-msdosdjgpp-g++

[yeti0904]

/usr/bin/ccache i586-pc-msdosdjgpp-g++ -c src/builtins.cc -O0 -std=c++17 -Wall -Wextra -Werror -pedantic -ggdb -fms-extensions -DYSL_VERSION='"a73d29d96a432a528691399ea41dee5288de0f02"' -o bin/builtins.o
In file included from /usr/lib/gcc/i586-pc-msdosdjgpp/12.1.0/include/c++/cmath:47,
                 from /usr/lib/gcc/i586-pc-msdosdjgpp/12.1.0/include/c++/math.h:36,
                 from src/_components.hh:5,
                 from src/builtins.hh:4,
                 from src/builtins.cc:1:
/usr/lib/gcc/i586-pc-msdosdjgpp/12.1.0/include/c++/bits/std_abs.h:38:15: fatal error: stdlib.h: No such file or directory
   38 | #include_next <stdlib.h>
      |               ^~~~~~~~~~
compilation terminated.

code:

#include <map>

i ran the setenv script in the linux64 release before doing this