some ifndefs for arduino

libs/pagerlib/pagerlib.c

-#include <fcntl.h>
-#include <dirent.h>
+#ifndef ARDUINO
+  #include <fcntl.h>
+  #include <dirent.h>
+  #include <sys/stat.h>
+  #include <sys/types.h>
+
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -7,8 +13,6 @@
 #include <stdlib.h>
 #include "things.h"
 #include "pagerlib.h"
-#include <sys/stat.h>
-#include <sys/types.h>
 
 
 #ifndef ARDUINO
@@ -155,6 +159,7 @@ inline int pl_send_message(struct pl_ctx *ctx) {
   return 0;
 }
 
+#ifndef ARDUINO
 /* pl_send_message_fifo(struct pl_ctx * ctx, char *fifo)
  * sends the pagermessage to a fifo
 */
@@ -168,6 +173,7 @@ int pl_send_message_fifo(struct pl_ctx *ctx, char *fifo)
   //unlink(fifo);
   return 0;
 } 
+#endif
 
 int pl_receive_message(struct pl_ctx * ctx)
 {
@@ -331,6 +337,7 @@ char * pl_load_public_key(char *filename)
 #endif
 }
 
+#ifndef ARDUINO
 int pl_load_public_keys_from_folder(struct pl_ctx *ctx, char const *folder)
 {
   printf("opening pubkey folder...\n");
@@ -365,6 +372,7 @@ int pl_load_public_keys_from_folder(struct pl_ctx *ctx, char const *folder)
     }
   }
 }
+#endif
 
 int pl_load_key_in_list(struct pl_ctx *ctx, struct pl_keypair *key)
 {