x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/y0.c -o math/y0 -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
math/y0.c:11:25: error: ‘y0’ undeclared here (not in a function)
   11 | double (*foo)(double) = y0;
      |                         ^~