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-rw-r--r--demos/modules/gwin/slider/gfxconf.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/demos/modules/gwin/slider/gfxconf.h b/demos/modules/gwin/slider/gfxconf.h
index 947fc4c8..84698905 100644
--- a/demos/modules/gwin/slider/gfxconf.h
+++ b/demos/modules/gwin/slider/gfxconf.h
@@ -9,6 +9,11 @@
#ifndef _GFXCONF_H
#define _GFXCONF_H
+/* The operating system to use - one of these must be defined */
+#define GFX_USE_OS_CHIBIOS TRUE
+#define GFX_USE_OS_WIN32 FALSE
+#define GFX_USE_OS_POSIX FALSE
+
/* GFX sub-systems to turn on */
#define GFX_USE_GDISP TRUE
#define GFX_USE_GWIN TRUE