remove unix style include

Makefile

@@ -1,6 +1,6 @@
-CC ?= gcc
-CFLAGS_EXTRA ?= 
-CFLAGS ?= -Wall -Wextra -Wpedantic -std=c17 -O3
+CC = gcc
+CFLAGS_EXTRA = 
+CFLAGS = -Wall -Wextra -Wpedantic -std=c17 -O3
 
 .PHONY: clean
 

hbas.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/errno.h>
+#include <errno.h>
 
 void hd(char *data, size_t len) {
     for (size_t ii = 0; ii < len; ii += 1) {