fix build error

/usr/bin/ld: kmscube@exe/cube-tex.c.o:/home/robclark/src/kmscube/debug/../cube-tex.c:47: multiple definition of `gl'; kmscube@exe/cube-smooth.c.o:/home/robclark/src/kmscube/debug/../cube-smooth.c:40: first defined here

1 files changed, 1 insertions, 1 deletions

diff --git a/cube-tex.c b/cube-tex.c
index 57fe02d..2714084 100644
--- a/cube-tex.c
+++ b/cube-tex.c
@@ -30,7 +30,7 @@
 #include "common.h"
 #include "esUtil.h"
 
-struct {
+static struct {
 	struct egl egl;
 
 	GLfloat aspect;