diff --git a/lisp/lispA-Z.c b/lisp/lispA-Z.c
index fd9f87e6..7a306366 100644
--- a/lisp/lispA-Z.c
+++ b/lisp/lispA-Z.c
@@ -22,6 +22,7 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 
 #include "lisp/lisp.h"
 #include "lispInt.h"
diff --git a/lisp/lispEval.c b/lisp/lispEval.c
index a65e924a..83a2e004 100644
--- a/lisp/lispEval.c
+++ b/lisp/lispEval.c
@@ -22,6 +22,7 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 
 #include "lisp/lisp.h"
 #include "lispInt.h"
diff --git a/lisp/lispGC.c b/lisp/lispGC.c
index 4bb4306f..d517f32f 100644
--- a/lisp/lispGC.c
+++ b/lisp/lispGC.c
@@ -23,6 +23,7 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 
diff --git a/lisp/lispIO.c b/lisp/lispIO.c
index d1128daa..fd22daa0 100644
--- a/lisp/lispIO.c
+++ b/lisp/lispIO.c
@@ -23,6 +23,8 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
+#include <ctype.h>
 
 #include "lisp/lisp.h"
 #include "lispInt.h"
diff --git a/lisp/lispMagic.c b/lisp/lispMagic.c
index e94e8398..85072a39 100644
--- a/lisp/lispMagic.c
+++ b/lisp/lispMagic.c
@@ -23,6 +23,7 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 
 #include "lisp/lisp.h"
 #include "lispInt.h"
diff --git a/lisp/lispMain.c b/lisp/lispMain.c
index beea7671..631387e3 100644
--- a/lisp/lispMain.c
+++ b/lisp/lispMain.c
@@ -22,6 +22,7 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 
 #include "lisp/lisp.h"
 #include "lispInt.h"
diff --git a/lisp/lispParse.c b/lisp/lispParse.c
index 16c7b15b..484891a0 100644
--- a/lisp/lispParse.c
+++ b/lisp/lispParse.c
@@ -22,6 +22,7 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
 #include <ctype.h>
 
 #include "lisp/lisp.h"
diff --git a/lisp/lispString.c b/lisp/lispString.c
index 6ed552a7..d43fa8e9 100644
--- a/lisp/lispString.c
+++ b/lisp/lispString.c
@@ -22,6 +22,8 @@
  *************************************************************************/
 
 #include <stdio.h>
+#include <string.h>
+#include <ctype.h>
 
 #include "lisp/lisp.h"
 #include "lispInt.h"