--- a/src/exe/rbdock.cxx	2021-02-04 13:32:41.561458052 +0900
+++ b/src/exe/rbdock.cxx	2021-02-04 13:33:07.033202240 +0900
@@ -465,7 +465,7 @@
 
 #ifdef _VISUAL_STUDIO 
 #else
-	optCon = poptGetContext(NULL, argc, argv, optionsTable, 0);
+	optCon = poptGetContext(NULL, argc, (const char **) argv, optionsTable, 0);
 	poptSetOtherOptionHelp(optCon, "-r<receptor.prm> -p<protocol.prm> -i<infile> -o<outfile> [options]");
 #endif