sparc: add DRI drivers for sparc patch from Fedora
diff --git a/configure.ac b/configure.ac
index f289501..f5cf33c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -645,6 +645,12 @@
                 DRI_DIRS="mach64 r128 r200 r300 radeon tdfx swrast"
             fi
             ;;
+        sparc*)
+            # Build only the drivers for cards that exist on sparc`
+            if test "x$DRI_DIRS" = x; then
+                DRI_DIRS="mach64 r128 r200 r300 radeon ffb"
+            fi
+            ;;
         esac
         ;;
     freebsd* | dragonfly*)