x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/j1.c -o math/j1 -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
math/j1.c:11:25: error: ‘j1’ undeclared here (not in a function)
   11 | double (*foo)(double) = j1;
      |                         ^~