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Fix build with GLib 2.68 and later.
Taken from upstream pull request:
https://github.com/autotrace/autotrace/pull/41
diff --git a/src/autotrace.h b/src/autotrace.h
--- a/src/autotrace.h
+++ b/src/autotrace.h
@@ -23,6 +23,9 @@
#include <stdio.h>
+#include "types.h"
+#include "color.h"
+
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
@@ -35,9 +38,6 @@ extern "C" {
* Typedefs
* ===================================================================== */
-#include "types.h"
-#include "color.h"
-
/* Third degree is the highest we deal with. */
enum _at_polynomial_degree {
AT_LINEARTYPE = 1,
diff --git a/src/color.h b/src/color.h
--- a/src/color.h
+++ b/src/color.h
@@ -24,6 +24,10 @@
#include <glib.h>
#include <glib-object.h>
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
typedef struct _at_color at_color;
struct _at_color {
guint8 r;
@@ -43,4 +47,7 @@ void at_color_free(at_color * color);
GType at_color_get_type(void);
#define AT_TYPE_COLOR (at_color_get_type ())
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
#endif /* not AT_COLOR_H */
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