--- ray/src/gen/atmos.h	2024/07/05 18:04:36	2.1
+++ ray/src/gen/atmos.h	2024/10/09 17:22:42	2.3
@@ -1,3 +1,4 @@
+/* RCSid $Id: atmos.h,v 2.3 2024/10/09 17:22:42 greg Exp $ */
 #ifndef ATMOS_H
 #define ATMOS_H
 
@@ -9,6 +10,10 @@
 #include "rtmath.h"
 #include "sun.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define NSSAMP 20
 
 typedef struct {
@@ -84,4 +89,11 @@ extern int compute_sundir(const int year, const int mo
 extern int precompute(const int sorder, const DpPaths dppaths, const Atmosphere *atmos,
                       int num_threads);
 
-#endif // ATMOS_H
+extern DATARRAY *get_indirect_irradiance(DATARRAY *dp, const double radius,
+                                const double mu_s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ATMOS_H */