Index: autoconf/configure.ac
==================================================================
--- autoconf/configure.ac
+++ autoconf/configure.ac
@@ -170,11 +170,11 @@
 #
 AC_ARG_ENABLE(session, [AS_HELP_STRING(
   [--enable-session], [enable the session extension [default=no]])], 
   [], [])
 if test x"$enable_session" = "xyes"; then
-  BUILD_CFLAGS="$BUILD_CFLAGS-DSQLITE_ENABLE_SESSION -DSQLITE_ENABLE_PREUPDATE_HOOK"
+  BUILD_CFLAGS="$BUILD_CFLAGS -DSQLITE_ENABLE_SESSION -DSQLITE_ENABLE_PREUPDATE_HOOK"
 fi
 #-----------------------------------------------------------------------
 
 #-----------------------------------------------------------------------
 #   --enable-debug