Incorporate bsdmake into buildsystem and reorganize libs

lib/libc/stdio/perror.c

@@ -0,0 +1,33 @@
+/*
+ * perror.c - print an error message on the standard error output
+ */
+/* $Header$ */
+
+#if	defined(_POSIX_SOURCE)
+#include	<sys/types.h>
+#endif
+#include	<stdio.h>
+#include	<errno.h>
+#include	<stdio.h>
+#include	<string.h>
+#include	"loc_incl.h"
+
+ssize_t _write(int d, const char *buf, size_t nbytes);
+
+void
+perror(const char *s)
+{
+	char *p;
+	int fd;
+
+	p = strerror(errno);
+	fd = fileno(stderr);
+	fflush(stdout);
+	fflush(stderr);
+	if (s && *s) {
+		_write(fd, s, strlen(s));
+		_write(fd, ": ", 2);
+	}
+	_write(fd, p, strlen(p));
+	_write(fd, "\n", 1);
+}