diff --git a/src/Lib/TriangleJRS/test_triangle.c b/src/Lib/TriangleJRS/test_triangle.c
index 5b1aa0eb..60c0b1be 100644
--- a/src/Lib/TriangleJRS/test_triangle.c
+++ b/src/Lib/TriangleJRS/test_triangle.c
@@ -1,5 +1,6 @@
 /* a test of the Shewchuk triangulator (lib form) */
 
+#include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 
diff --git a/src/Lib/poly2tri/construct.c b/src/Lib/poly2tri/construct.c
index a0ea0c94..24745a19 100644
--- a/src/Lib/poly2tri/construct.c
+++ b/src/Lib/poly2tri/construct.c
@@ -1,5 +1,6 @@
 #include "triangulate.h"
 #include <math.h>
+#include <string.h>
 
 #ifdef _MSC_VER
 #  include <memory.h>
diff --git a/src/Lib/poly2tri/monotone.c b/src/Lib/poly2tri/monotone.c
index 97749027..9552302f 100644
--- a/src/Lib/poly2tri/monotone.c
+++ b/src/Lib/poly2tri/monotone.c
@@ -1,5 +1,6 @@
 #include "triangulate.h"
 #include <math.h>
+#include <string.h>
 #ifdef _MSC_VER
 #  include <memory.h>
 #endif
diff --git a/src/Lib/poly2tri/tri.c b/src/Lib/poly2tri/tri.c
index 900717ca..4e5e5485 100644
--- a/src/Lib/poly2tri/tri.c
+++ b/src/Lib/poly2tri/tri.c
@@ -1,4 +1,5 @@
 #include "triangulate.h"
+#include <string.h>
 /* #include <sys/time.h> */
 #ifdef _MSC_VER
 #  include <memory.h>
diff --git a/src/Lib/shapelib/shpcreate.c b/src/Lib/shapelib/shpcreate.c
index c33dd256..7b7f72cb 100644
--- a/src/Lib/shapelib/shpcreate.c
+++ b/src/Lib/shapelib/shpcreate.c
@@ -51,6 +51,7 @@
 static char rcsid[] = 
   "$Id: shpcreate.c,v 1.5 2002/01/15 14:36:07 warmerda Exp $";
 
+#include <stdlib.h>
 #include "shapefil.h"
 
 int main( int argc, char ** argv )
diff --git a/src/Lib/shapelib/shpdump.c b/src/Lib/shapelib/shpdump.c
index 5dc1cfa8..fd595ca0 100644
--- a/src/Lib/shapelib/shpdump.c
+++ b/src/Lib/shapelib/shpdump.c
@@ -67,6 +67,7 @@
 static char rcsid[] = 
   "$Id: shpdump.c,v 1.10 2002/04/10 16:59:29 warmerda Exp $";
 
+#include <stdlib.h>
 #include "shapefil.h"
 
 int main( int argc, char ** argv )
diff --git a/src/Lib/shapelib/shputils.c b/src/Lib/shapelib/shputils.c
index 3e8f065d..38f59c88 100644
--- a/src/Lib/shapelib/shputils.c
+++ b/src/Lib/shapelib/shputils.c
@@ -79,6 +79,7 @@
 static char rcsid[] = 
   "$Id: shputils.c,v 1.7 2003/02/25 17:20:22 warmerda Exp $";
 
+#include <stdlib.h>
 #include "shapefil.h"
 #include "string.h"
 #ifndef FALSE