density/density.c    | 1 +
 utility/g94cub2pl.c  | 1 +
 utility/gamess2plt.c | 1 +
 utility/gcube2plt.c  | 1 +
 utility/jaguar2plt.c | 1 +
 vss/vssmod.c         | 1 +
 6 files changed, 6 insertions(+)

diff --git a/density/density.c b/density/density.c
index 130a48e..ee218c5 100755
--- a/density/density.c
+++ b/density/density.c
@@ -13,6 +13,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <malloc.h>
+#include <stdlib.h>
 
 #define VERBOSE    0
 #define BUFF_LEN 500
diff --git a/utility/g94cub2pl.c b/utility/g94cub2pl.c
index e773ab2..94fbcfd 100755
--- a/utility/g94cub2pl.c
+++ b/utility/g94cub2pl.c
@@ -315,6 +315,7 @@ which can be read by gOpenMol or SCARECROW.
 #include <sys/types.h>
 #include <malloc.h>
 #include <string.h>
+#include <stdlib.h>
 
 #define BUFF_LEN        256
 #define BOHR_RADIUS     0.52917715  /* conversion constant */
diff --git a/utility/gamess2plt.c b/utility/gamess2plt.c
index 3f6108e..5da481d 100755
--- a/utility/gamess2plt.c
+++ b/utility/gamess2plt.c
@@ -86,6 +86,7 @@ which can be read by gOpenMol or SCARECROW.
 #include <sys/types.h>
 #include <malloc.h>
 #include <string.h>
+#include <stdlib.h>
 
 #define BUFF_LEN        256
 #define BOHR_RADIUS     0.52917715  /* conversion constant */
diff --git a/utility/gcube2plt.c b/utility/gcube2plt.c
index c5f7b5e..711bad3 100755
--- a/utility/gcube2plt.c
+++ b/utility/gcube2plt.c
@@ -306,6 +306,7 @@ which can be read by gOpenMol or SCARECROW.
 #include <sys/types.h>
 #include <malloc.h>
 #include <string.h>
+#include <stdlib.h>
 
 #define BUFF_LEN        256
 #define BOHR_RADIUS     0.52917715  /* conversion constant */
diff --git a/utility/jaguar2plt.c b/utility/jaguar2plt.c
index 657128c..96d6ac1 100755
--- a/utility/jaguar2plt.c
+++ b/utility/jaguar2plt.c
@@ -26,6 +26,7 @@ fastes running coordinate.
 #include <sys/types.h>
 #include <malloc.h>
 #include <string.h>
+#include <stdlib.h>
 
 #define BUFF_LEN        256
 #define BOHR_RADIUS     0.52917715  /* conversion constant */
diff --git a/vss/vssmod.c b/vss/vssmod.c
index 957d2e5..9d73978 100755
--- a/vss/vssmod.c
+++ b/vss/vssmod.c
@@ -20,6 +20,7 @@ C- for the potentials
 #include <math.h>
 #include <string.h>
 #include <malloc.h>
+#include <stdlib.h>
 
 #define LINE_LEN 80
 #define BUFF_LEN 500