cc -pthread   -Wall -Wextra -Werror=implicit-function-declaration math/nexttowardl.c -o math/nexttowardl -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -lintl -liconv
math/nexttowardl.c:11: warning: ignoring ‘#pragma STDC FENV_ACCESS’ [-Wunknown-pragmas]
   11 | #pragma STDC FENV_ACCESS ON
math/nexttowardl.c: In function ‘test’:
math/nexttowardl.c:38:30: error: implicit declaration of function ‘nexttowardl’ [-Wimplicit-function-declaration]
   38 |         long double output = nexttowardl(input1, input2);
      |                              ^~~~~~~~~~~
math/nexttowardl.c:10:1: note: include ‘<math.h>’ or provide a declaration of ‘nexttowardl’
    9 | #include "../basic.h"
  +++ |+#include <math.h>
   10 | 
math/nexttowardl.c:38:30: warning: incompatible implicit declaration of built-in function ‘nexttowardl’ [-Wbuiltin-declaration-mismatch]
   38 |         long double output = nexttowardl(input1, input2);
      |                              ^~~~~~~~~~~
math/nexttowardl.c:38:30: note: include ‘<math.h>’ or provide a declaration of ‘nexttowardl’