diff -Nurp VirtualBox-5.1.0.p4/configure VirtualBox-5.1.0.p9/configure
--- VirtualBox-5.1.0.p4/configure	2016-07-12 17:47:20.000000000 +0300
+++ VirtualBox-5.1.0.p9/configure	2016-07-13 00:59:37.981649681 +0300
@@ -2906,7 +2906,7 @@ if [ $ONLY_ADDITIONS -eq 0 ]; then
   # don't check for yasm for the time beeing as 0.40 and 0.50 both have known bugs
   # [ "$OS" != "darwin" ] && check_yasm
   [ "$OS" != "darwin"  ] && check_xsltproc
-  [ "$OS" != "darwin"  ] && check_mkisofs
+  #[ "$OS" != "darwin"  ] && check_mkisofs
 fi
 
 # the libraries
@@ -2979,7 +2979,7 @@ if [ "$OS" = "linux" ]; then
   check_compiler_h
   [ $ONLY_ADDITIONS -eq 0 -a "$BUILD_MACHINE" = "amd64" -a $WITH_VMMRAW -eq 1 ] && check_32bit
   # tools/common/makeself*
-  [ $OSE -ge 1 ] && check_makeself
+ # [ $OSE -ge 1 ] && check_makeself
 fi
 
 [ -n "$SETUP_WINE" ] && setup_wine