--- fbgrab.c
+++ fbgrab.c
@@ -22,6 +22,7 @@
 
 #include <getopt.h>
 #include <sys/vt.h>   /* to handle vt changing */
+#include <zlib.h>     /* Z_BEST_COMPRESSION */
 #include <png.h>      /* PNG lib */
 #include <linux/fb.h> /* to handle framebuffer ioctls */