See: https://github.com/HPCToolkit/hpctoolkit/issues/309

diff --git a/src/tool/hpcrun/gpu/gpu-metrics.h b/src/tool/hpcrun/gpu/gpu-metrics.h
index ea0958156..fa3bceab1 100644
--- a/src/tool/hpcrun/gpu/gpu-metrics.h
+++ b/src/tool/hpcrun/gpu/gpu-metrics.h
@@ -61,7 +61,7 @@
 //*****************************************************************************
 
 
-enum {
+typedef enum {
   GPU_INST_STALL_ANY                   = 0
 } gpu_inst_stall_all_t;