diff --git a/src/plugins/weatherdata/gfs/g2clib/grib2.h b/src/plugins/weatherdata/gfs/g2clib/grib2.h
old mode 100755
new mode 100644
index 432a11f78..7d40f349c
--- a/src/plugins/weatherdata/gfs/g2clib/grib2.h
+++ b/src/plugins/weatherdata/gfs/g2clib/grib2.h
@@ -1,5 +1,10 @@
 #ifndef _grib2_H
 #define _grib2_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include<stdio.h>
 
 #define G2_VERSION "g2clib-1.5.0"
@@ -245,5 +250,9 @@ int pack_gp(g2int *, g2int *, g2int *,
             g2int *, g2int *, g2int *, g2int *, g2int *,
             g2int *, g2int *, g2int *);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /*  _grib2_H  */