diff -up openwsman-2.8.1/bindings/openwsman.i.orig openwsman-2.8.1/bindings/openwsman.i
--- openwsman-2.8.1/bindings/openwsman.i.orig	2025-01-23 10:23:52.000000000 +0100
+++ openwsman-2.8.1/bindings/openwsman.i	2025-10-21 16:56:01.025576984 +0200
@@ -105,15 +105,8 @@ SWIGINTERNINLINE SV *SWIG_From_double  S
 #if HAVE_RUBY_THREAD_H /* New threading model */
 #include <ruby/thread.h>
 #endif
-#if RUBY_VERSION > 18
-  #if HAVE_RB_IO_T
-    #define rb_fptr_t rb_io_t
-  #else
-    #define rb_fptr_t struct rb_io
-  #endif
-#else
-  #define rb_fptr_t struct OpenFile
-#endif
+/* Use rb_io_t for Ruby 1.9+ */
+#define rb_fptr_t rb_io_t
 %}
 
 %typemap(in) FILE* {
@@ -122,11 +115,7 @@ SWIGINTERNINLINE SV *SWIG_From_double  S
   Check_Type($input, T_FILE);
   GetOpenFile($input, fptr);
   /*rb_io_check_writable(fptr);*/
-#if RUBY_VERSION > 18
   $1 = rb_io_stdio_file(fptr);
-#else
-  $1 = GetReadFile(fptr);
-#endif
 }
 
 #endif /* SWIGRUBY */