diff --git a/README.md b/README.md
index 460ce67..1880a9b 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,13 @@ Own implementation of *nix utils
 License: wtfpl  
 
 https://trivial.technology/  
+
+
+Unportable:  
+	proc_parser  
+	ps  
+	dmesg  
+	mount  
+	umount  
+	nproc  
+	pivot_root  
diff --git a/TODO b/TODO
index 7c5f761..e7dc62c 100644
--- a/TODO
+++ b/TODO
@@ -49,6 +49,5 @@ BUGS:
 	xargs (getopt with glibc)
 
 FIX:
- ps (proc_parser.h)
  echo (escape)
  que (unicode)
diff --git a/libmu/mode_to_str.c b/libmu/mode_to_str.c
index 3bf00fe..fe04137 100644
--- a/libmu/mode_to_str.c
+++ b/libmu/mode_to_str.c
@@ -1,5 +1,4 @@
 #include <stdio.h>
-#include <sys/stat.h>
 #include "mode_to_str.h"
 
 char mode[11];
diff --git a/libmu/mode_to_str.h b/libmu/mode_to_str.h
index 50f0ed7..3047e86 100644
--- a/libmu/mode_to_str.h
+++ b/libmu/mode_to_str.h
@@ -1,5 +1,6 @@
 #ifndef _MODE_TO_STR_H
 #define _MODE_TO_STR_H
+#include <sys/stat.h>
 
 char *mu_mode_2_str(mode_t file_mode);
 #endif
diff --git a/libmu/parse_mode.h b/libmu/parse_mode.h
index 18e17ff..a3f6a06 100644
--- a/libmu/parse_mode.h
+++ b/libmu/parse_mode.h
@@ -1,5 +1,6 @@
 #ifndef _PARSE_MODE_H
 #define _PARSE_MODE_H
+#include <sys/stat.h>
 
 mode_t mu_parse_mode(const char *s, mode_t cur_mode);
 #endif
diff --git a/libmu/parse_mount.h b/libmu/parse_mount.h
index e0b7e20..44e99b6 100644
--- a/libmu/parse_mount.h
+++ b/libmu/parse_mount.h
@@ -1,6 +1,7 @@
 #ifndef _PARSE_MOUNT_H
 #define _PARSE_MOUNT_H
 #include <sys/mount.h>
+#include <stdlib.h>
 
 typedef struct {
 	char *opt;
diff --git a/libmu/pw_check.c b/libmu/pw_check.c
index 45c31f5..37805f6 100644
--- a/libmu/pw_check.c
+++ b/libmu/pw_check.c
@@ -51,4 +51,3 @@ int pw_check(const char *prog_name, const struct passwd *pw, const char *pass) {
 
 	return 1;
 }
-
diff --git a/src/date.c b/src/date.c
index 1ab8c8d..4b3bff4 100644
--- a/src/date.c
+++ b/src/date.c
@@ -1,5 +1,5 @@
 #define _XOPEN_SOURCE
-#define __USE_POSIX199309
+#define _POSIX_C_SOURCE 1999309L
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>