now declare strdup as extern

find_path.c

@@ -61,6 +61,9 @@ extern char *getcwd();
 #else
 extern char *getwd();
 #endif
+#ifndef NEED_STRDUP
+extern char *strdup();
+#endif
 
 
 /*******************************************************************

sudo.c

@@ -55,6 +55,9 @@
 #include <sys/param.h>
 #include "sudo.h"
 extern char *malloc();
+#ifndef NEED_STRDUP
+extern char *strdup();
+#endif
 
 int Argc;
 char **Argv;