https://bugs.gentoo.org/706934
--- a/lib_ccx/ccx_decoders_708.h
+++ b/lib_ccx/ccx_decoders_708.h
@@ -368,7 +368,7 @@
 									 unsigned char *data,
 									 int data_length);
 
-ccx_dtvcc_pen_color ccx_dtvcc_default_pen_color;
-ccx_dtvcc_pen_attribs ccx_dtvcc_default_pen_attribs;
+extern ccx_dtvcc_pen_color ccx_dtvcc_default_pen_color;
+extern ccx_dtvcc_pen_attribs ccx_dtvcc_default_pen_attribs;
 
 #endif