autoconf: Improve help text for demos and DRI drivers

Changed the text for the default demos to be "auto" instead of "yes"
since that didn't make much sense in this context. Added an example
value for the --with-dri-drivers option as suggested by Brian.

diff --git a/configure.ac b/configure.ac
index b040b4d20bc0d96210b9c27d9552ca99d196cb62..f2f2d75a1a03e09ebbed6bf78a39903ad26bfe82 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -233,7 +233,7 @@ fi
 AC_ARG_WITH(demos,
     [AS_HELP_STRING([--with-demos@<:@=DIRS...@:>@],
         [optional comma delimited demo directories to build
-        @<:@default=yes if source available@:>@])],
+        @<:@default=auto if source available@:>@])],
     with_demos="$withval",
     with_demos="$default_demos")
 if test "x$with_demos" = x; then
@@ -372,7 +372,7 @@ AC_ARG_ENABLE(driglx-direct,
 dnl Which drivers to build - default is chosen by platform
 AC_ARG_WITH(dri-drivers,
     [AS_HELP_STRING([--with-dri-drivers@<:@=DIRS...@:>@],
-        [comma delimited DRI drivers to build @<:@default=auto by platform@:>@])],
+        [comma delimited DRI drivers, e.g. "i965,radeon,nouveau" @<:@default=auto@:>@])],
     with_dri_drivers="$withval",
     with_dri_drivers=yes)
 if test "x$with_dri_drivers" = x; then