glsl: make stack compile.

it would be nice if this stuff would be test built on mesa's primary
platform with mesa's primary build system.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/glsl/pp/sl_pp_macro.h b/src/glsl/pp/sl_pp_macro.h
index 2967baf3375..1d210681091 100644
--- a/src/glsl/pp/sl_pp_macro.h
+++ b/src/glsl/pp/sl_pp_macro.h
@@ -33,6 +33,7 @@
 
 struct sl_pp_context;
 struct sl_pp_process_state;
+struct sl_pp_token_buffer;
 
 struct sl_pp_macro_formal_arg {
    int name;