clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations search/tsearch.c -o search/tsearch -D_POSIX_C_SOURCE=202405L  -lm  -lintl
search/tsearch.c:11:1: error: unknown type name 'posix_tnode'
posix_tnode *(*foo)(const void *, posix_tnode **, int(*)(const void *, const void *)) = tsearch;
^
search/tsearch.c:11:35: error: unknown type name 'posix_tnode'
posix_tnode *(*foo)(const void *, posix_tnode **, int(*)(const void *, const void *)) = tsearch;
                                  ^
2 errors generated.