>> Ruby 1.8.7 from rubyinstaller.org also uses i386-mingw32. Can you
>> confirm this is default value for all 1.8.x versions? If not, I
>> suggest to leave it as it currently is, because there is no way to
>> detect exact ruby version in the makefile.
>
> The installer for ruby 1.8.6 use i386-mswin32
> The installers for ruby 1.8.7 and 1.9.1 use i386-mingw32
> but their binaries use i386-mswin32

Ok, it seems the rule cannot be implemented in Make_ming.mak. Here is
a version which check for existence of
lib\ruby\<long-ver>\i386-mingw32 directory. The patch should be
applied to clean Vim without old patch for Ruby integration.

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--- ../vim-bak/src/Make_ming.mak        Tue Mar 02 18:16:09 2010 +0100
+++ ./src/Make_ming.mak Sat Mar 06 18:28:15 2010 +0300
@@ -212,23 +212,25 @@
 RUBY_VER_LONG = 1.6
 endif
 
+ifndef RUBY_PLATFORM
 ifeq ($(RUBY_VER), 16)
-ifndef RUBY_PLATFORM
 RUBY_PLATFORM = i586-mswin32
-endif
-ifndef RUBY_INSTALL_NAME
-RUBY_INSTALL_NAME = mswin32-ruby$(RUBY_VER)
-endif
+else ifneq ("X$(wildcard, $(RUBY)/lib/ruby/$(RUBY_VER_LONG)/i386-mingw32)", X)
+RUBY_PLATFORM = i386-mingw32
 else
-ifndef RUBY_PLATFORM
 RUBY_PLATFORM = i386-mswin32
 endif
+endif
+
 ifndef RUBY_INSTALL_NAME
+ifeq ($(RUBY_VER), 16)
+RUBY_INSTALL_NAME = mswin32-ruby$(RUBY_VER)
+else
 RUBY_INSTALL_NAME = msvcrt-ruby$(RUBY_VER)
 endif
 endif
 
-RUBYINC =-I $(RUBY)/lib/ruby/$(RUBY_VER_LONG)/$(RUBY_PLATFORM)
+RUBYINC =-I $(RUBY)/lib/ruby/$(RUBY_VER_LONG)/$(RUBY_PLATFORM) -I 
$(RUBY)/include/ruby-$(RUBY_VER_LONG) -I 
$(RUBY)/include/ruby-$(RUBY_VER_LONG)/$(RUBY_PLATFORM)
 ifeq (no, $(DYNAMIC_RUBY))
 RUBYLIB = -L$(RUBY)/lib -l$(RUBY_INSTALL_NAME)
 endif
--- ../vim-bak/src/if_ruby.c    Tue Mar 02 18:16:09 2010 +0100
+++ ./src/if_ruby.c     Sat Mar 06 18:28:15 2010 +0300
@@ -39,8 +39,8 @@
 # define rb_cTrueClass         (*dll_rb_cTrueClass)
 # if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
 /*
- * On ver 1.8, all Ruby functions are exported with "__declspce(dllimport)"
- * in ruby.h.  But it cause trouble for these variables, because it is
+ * On ver 1.8, all Ruby functions are exported with "__declspec(dllimport)"
+ * in ruby.h.  But it causes trouble for these variables, because it is
  * defined in this file.  When defined this RUBY_EXPORT it modified to
  * "extern" and be able to avoid this problem.
  */
@@ -53,6 +53,11 @@
 # undef _WIN32_WINNT
 #endif
 
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
+/* Ruby 1.9 defines a number of static functions which use rb_num2long and 
rb_int2big */
+# define rb_num2long rb_num2long_stub
+# define rb_int2big rb_int2big_stub
+#endif
 #include <ruby.h>
 #if defined(RUBY_VERSION) && RUBY_VERSION >= 19
 # include <ruby/encoding.h>
@@ -159,7 +164,14 @@
 #define rb_str_concat                  dll_rb_str_concat
 #define rb_str_new                     dll_rb_str_new
 #define rb_str_new2                    dll_rb_str_new2
-#if defined(RUBY_VERSION) && RUBY_VERSION >= 19
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
+# define rb_string_value_ptr           dll_rb_string_value_ptr
+# define rb_float_new                  dll_rb_float_new
+# define rb_ary_new                    dll_rb_ary_new
+# define rb_ary_push                   dll_rb_ary_push
+#endif
+#if defined(RUBY_VERSION) && RUBY_VERSION >= 19 \
+    || defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
 # define rb_errinfo                    dll_rb_errinfo
 #else
 # define ruby_errinfo                  (*dll_ruby_errinfo)
@@ -226,7 +238,8 @@
 static VALUE (*dll_rb_str_concat) (VALUE, VALUE);
 static VALUE (*dll_rb_str_new) (const char*, long);
 static VALUE (*dll_rb_str_new2) (const char*);
-#if defined(RUBY_VERSION) && RUBY_VERSION >= 19
+#if defined(RUBY_VERSION) && RUBY_VERSION >= 19 \
+    || defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
 static VALUE (*dll_rb_errinfo) (void);
 #else
 static VALUE *dll_ruby_errinfo;
@@ -235,6 +248,15 @@
 static void (*dll_ruby_init_loadpath) (void);
 static void (*dll_NtInitialize) (int*, char***);
 #if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
+static char * (*dll_rb_string_value_ptr) (volatile VALUE*);
+static VALUE (*dll_rb_float_new) (double);
+static VALUE (*dll_rb_ary_new) (void);
+static VALUE (*dll_rb_ary_push) (VALUE, VALUE);
+#endif
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
+static VALUE (*dll_rb_int2big)(SIGNED_VALUE);
+#endif
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
 static int (*dll_rb_w32_snprintf)(char*, size_t, const char*, ...);
 #endif
 
@@ -246,6 +268,17 @@
 static VALUE (*dll_rb_sprintf) (const char*, ...);
 #endif
 
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
+static SIGNED_VALUE rb_num2long_stub(VALUE x)
+{
+    return dll_rb_num2long(x);
+}
+static VALUE rb_int2big_stub(SIGNED_VALUE x)
+{
+    return dll_rb_int2big(x);
+}
+#endif
+
 static HINSTANCE hinstRuby = 0; /* Instance of ruby.dll */
 
 /*
@@ -301,17 +334,33 @@
     {"rb_str_concat", (RUBY_PROC*)&dll_rb_str_concat},
     {"rb_str_new", (RUBY_PROC*)&dll_rb_str_new},
     {"rb_str_new2", (RUBY_PROC*)&dll_rb_str_new2},
-#if defined(RUBY_VERSION) && RUBY_VERSION >= 19
+#if defined(RUBY_VERSION) && RUBY_VERSION >= 19 \
+    || defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
     {"rb_errinfo", (RUBY_PROC*)&dll_rb_errinfo},
 #else
     {"ruby_errinfo", (RUBY_PROC*)&dll_ruby_errinfo},
 #endif
     {"ruby_init", (RUBY_PROC*)&dll_ruby_init},
     {"ruby_init_loadpath", (RUBY_PROC*)&dll_ruby_init_loadpath},
-    {"NtInitialize", (RUBY_PROC*)&dll_NtInitialize},
+    {
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER < 19
+    "NtInitialize"
+#else
+    "ruby_sysinit"
+#endif
+    , (RUBY_PROC*)&dll_NtInitialize},
 #if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
     {"rb_w32_snprintf", (RUBY_PROC*)&dll_rb_w32_snprintf},
 #endif
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
+    {"rb_string_value_ptr", (RUBY_PROC*)&dll_rb_string_value_ptr},
+    {"rb_float_new", (RUBY_PROC*)&dll_rb_float_new},
+    {"rb_ary_new", (RUBY_PROC*)&dll_rb_ary_new},
+    {"rb_ary_push", (RUBY_PROC*)&dll_rb_ary_push},
+#endif
+#if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
+    {"rb_int2big", (RUBY_PROC*)&dll_rb_int2big},
+#endif
 #if defined(RUBY_VERSION) && RUBY_VERSION >= 19
     {"ruby_script", (RUBY_PROC*)&dll_ruby_script},
     {"rb_enc_find_index", (RUBY_PROC*)&dll_rb_enc_find_index},
@@ -569,7 +618,8 @@
 static void error_print(int state)
 {
 #ifndef DYNAMIC_RUBY
-#if !(defined(RUBY_VERSION) &&  RUBY_VERSION >= 19)
+#if !(defined(RUBY_VERSION) && RUBY_VERSION >= 19) \
+    && !(defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19)
     RUBYEXTERN VALUE ruby_errinfo;
 #endif
 #endif
@@ -605,7 +655,8 @@
        break;
     case TAG_RAISE:
     case TAG_FATAL:
-#if defined(RUBY_VERSION) && RUBY_VERSION >= 19
+#if defined(RUBY_VERSION) && RUBY_VERSION >= 19 \
+    || defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 19
        eclass = CLASS_OF(rb_errinfo());
        einfo = rb_obj_as_string(rb_errinfo());
 #else

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