added datashadow

configure.in

@@ -7,7 +7,8 @@ AC_PROG_CC
 AC_ARG_ENABLE([debugging],              [  --enable-debugging                enable -g when compiling])
 AC_ARG_ENABLE([cgc],              	[  --enable-cgc                enable -DCGC when compiling for CGC binaries])
 AC_ARG_ENABLE([inferfn],              	[  --enable-inferfn                enable -DCGC when compiling for CGC binaries])
-AC_ARG_ENABLE([buffrecv],              	[  --enable-buffrecv                enable -DCGC when compiling for CGC binaries])
+AC_ARG_ENABLE([buffrecv],              	[  --enable-buffrecv      enable -DCGC when compiling for CGC binaries])
+AC_ARG_ENABLE([datashadow],            	[  --enable-datashadow    enable data shadowing])
 AC_ARG_ENABLE([libc],              	[  --enable-libc                enable $1 for building ])
 
 enable_dir()
@@ -73,6 +74,7 @@ enable_dir hookdynamic
 enable_dir canaries
 enable_dir cookbook
 enable_dir buffrecv
+enable_dir datashadow
 
 AC_OUTPUT(Makefile)