diff --git a/src/lib/system/darwin/clang/Console.Mod b/src/lib/system/darwin/clang/Console.Mod
index e523ef7b..93be9373 100644
--- a/src/lib/system/darwin/clang/Console.Mod
+++ b/src/lib/system/darwin/clang/Console.Mod
@@ -7,6 +7,9 @@ MODULE Console;  (* J. Templ, 29-June-96 *)
   VAR line: ARRAY 128 OF CHAR;
     pos: INTEGER;
 
+  PROCEDURE -includeUnistd()
+    "#include <unistd.h>";
+
   PROCEDURE -Write(adr, n: LONGINT)
     "write(1/*stdout*/, adr, n)";
 
diff --git a/src/lib/system/darwin/clang/x86_64/Unix.Mod b/src/lib/system/darwin/clang/x86_64/Unix.Mod
index 14cece97..cbcf6d8d 100644
--- a/src/lib/system/darwin/clang/x86_64/Unix.Mod
+++ b/src/lib/system/darwin/clang/x86_64/Unix.Mod
@@ -317,9 +317,37 @@ from man gettimeofday
   PROCEDURE -includeStat()
     "#include <sys/stat.h>";
 
+    (* for select() *)
+  PROCEDURE -includeSelect()
+    "#include <sys/select.h>";
+
+     (* for kill() *)
+  PROCEDURE -includeSignal()
+     "#include <signal.h>";
+
+     (* for read() also *)
+     PROCEDURE -includeTypes()
+        "#include <sys/types.h>";
+
+	PROCEDURE -includeUio()
+	 "#include <sys/uio.h>";
+
+    (* for getpid(), lseek(), close(), fsync(), ftruncate(), read() *)
+  PROCEDURE -includeUnistd()
+     "#include <unistd.h>";
+
+
+     (* for rename() *)
+  PROCEDURE -includeStdio()
+     "#include <stdio.h>";
+
   PROCEDURE -includeErrno()
     "#include <errno.h>";
 
+      (* for open() *)
+  PROCEDURE -includeFcntl()
+     "#include <fcntl.h>";
+
   PROCEDURE -err(): LONGINT
     "errno";
 
diff --git a/src/lib/v4/Files.Mod b/src/lib/v4/Files.Mod
index 454736be..adf51fd4 100644
--- a/src/lib/v4/Files.Mod
+++ b/src/lib/v4/Files.Mod
@@ -66,6 +66,10 @@ MODULE Files;  (* J. Templ 1.12. 89/12.4.95 Oberon files mapped onto Unix files
   PROCEDURE -includetime()
       '#include "time.h"';
 
+(* for getcwd() *)
+  PROCEDURE -includeUnistd()
+      '#include <unistd.h>';
+
   PROCEDURE -localtime(VAR clock: LONGINT): Time
     "(Files_Time) localtime(clock)";
 
diff --git a/src/lib/v4/Kernel.Mod b/src/lib/v4/Kernel.Mod
index a13f9d3b..ecfc166d 100644
--- a/src/lib/v4/Kernel.Mod
+++ b/src/lib/v4/Kernel.Mod
@@ -47,6 +47,9 @@ MODULE Kernel;
 (* for localtime *)
   PROCEDURE -includetime()
     '#include "time.h"';
+(* for getcwd() *)
+  PROCEDURE -includeUnistd()
+    '#include <unistd.h>';
 
   PROCEDURE -Lock*()
     "SYSTEM_lock++";
diff --git a/src/lib/v4/OakFiles.Mod b/src/lib/v4/OakFiles.Mod
index 77449c30..44ee35d4 100644
--- a/src/lib/v4/OakFiles.Mod
+++ b/src/lib/v4/OakFiles.Mod
@@ -66,6 +66,10 @@ MODULE OakFiles;  (* J. Templ 1.12. 89/12.4.95 Oberon files mapped onto Unix fil
   PROCEDURE -includetime()
       '#include "time.h"';
 
+(* for getcwd() *)
+  PROCEDURE -includeUnistd()
+      '#include <unistd.h>';
+
   PROCEDURE -localtime(VAR clock: LONGINT): Time
     "(OakFiles_Time) localtime(clock)";