diff -p -up ppmtocpva-1.0/ppmtocpva.c.includes ppmtocpva-1.0/ppmtocpva.c
--- ppmtocpva-1.0/ppmtocpva.c.includes	2001-08-04 23:22:24.000000000 +0200
+++ ppmtocpva-1.0/ppmtocpva.c	2010-01-16 01:40:58.000000000 +0100
@@ -17,8 +17,9 @@
 #include <unistd.h>
 #include <math.h>
 #include <assert.h>
-#include <pgm.h>
-#include <ppm.h>
+#include <string.h>
+#include <netpbm/pgm.h>
+#include <netpbm/ppm.h>
 
 static int highres = 0;
 static int halftone = 0;