cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations complex/csqrtl.c -o complex/csqrtl -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
complex/csqrtl.c:5:51: error: ‘csqrtl’ undeclared here (not in a function); did you mean ‘csqrtf’?
    5 | long double complex (*foo)(long double complex) = csqrtl;
      |                                                   ^~~~~~
      |                                                   csqrtf