x86_64-managarm-gcc -pthread   -Wall -Wextra -Werror=implicit-function-declaration math/j0.c -o math/j0 -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -lintl -liconv -lintl -liconv
math/j0.c:11: warning: ignoring ‘#pragma STDC FENV_ACCESS’ [-Wunknown-pragmas]
   11 | #pragma STDC FENV_ACCESS ON
math/j0.c: In function ‘test’:
math/j0.c:38:25: error: implicit declaration of function ‘j0’ [-Wimplicit-function-declaration]
   38 |         double output = j0(input1);
      |                         ^~
math/j0.c:38:25: warning: incompatible implicit declaration of built-in function ‘j0’ [-Wbuiltin-declaration-mismatch]