autoconf: Default the build to DRI on OS+CPU combos where it's expected.
diff --git a/configure.ac b/configure.ac
index 7db1830..8566384 100644
--- a/configure.ac
+++ b/configure.ac
@@ -237,11 +237,26 @@
dnl Driver configuration. Options are xlib, dri and osmesa right now.
dnl More later: directfb, fbdev, ...
dnl
+default_driver="xlib"
+
+case "$host_os" in
+linux*)
+ case "$host_cpu" in
+ i*86|x86_64|powerpc*) default_driver="dri";;
+ esac
+ ;;
+freebsd* | dragonfly*)
+ case "$host_cpu" in
+ i*86|x86_64) default_driver="dri";;
+ esac
+ ;;
+esac
+
AC_ARG_WITH(driver,
[AS_HELP_STRING([--with-driver=DRIVER],
- [driver for Mesa: xlib,dri,osmesa @<:@default=xlib@:>@])],
+ [driver for Mesa: xlib,dri,osmesa @<:@default=dri when available, or xlib@:>@])],
mesa_driver="$withval",
- mesa_driver="xlib")
+ mesa_driver="$default_driver")
dnl Check for valid option
case "x$mesa_driver" in
xxlib|xdri|xosmesa)