diff --git a/src/Makefile b/src/Makefile
index c790662..e6d26b1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -105,8 +105,8 @@
 # 4. "make test"  {{{1
 #	This is optional.  This will run Vim scripts on a number of test
 #	files, and compare the produced output with the expected output.
-#	If all is well, you will get the "ALL DONE" message in the end.  See
-#	below (search for "/^test").
+#	If all is well, you will get the "ALL DONE" message in the end.  If a
+#	test fails you get "TEST FAILURE".  See below (search for "/^test").
 #
 # 5. "make install"  {{{1
 #	If the new Vim seems to be working OK you can install it and the
@@ -533,6 +533,11 @@
 #CFLAGS = -g -DDEBUG -Wall -Wshadow -Wmissing-prototypes
 #CFLAGS = -g -O2 '-DSTARTUPTIME="vimstartup"' -fno-strength-reduce -Wall -Wmissing-prototypes
 
+# Use this with GCC to check for mistakes, unused arguments, etc.
+#CFLAGS = -g -Wall -Wextra -Wmissing-prototypes -Wunreachable-code
+#PYTHON_CFLAGS_EXTRA = -Wno-missing-field-initializers
+#MZSCHEME_CFLAGS_EXTRA = -Wno-unreachable-code
+
 # EFENCE - Electric-Fence malloc debugging: catches memory accesses beyond
 # allocated memory (and makes every malloc()/free() very slow).
 # Electric Fence is free (search ftp sites).
@@ -551,12 +556,13 @@
 # }}}
 
 # LINT - for running lint
-#  For standard lint
-#LINT = lint
-#LINT_OPTIONS = -beprxzF
-#  For splint  (see cleanlint.vim for filtering the output)
-LINT = splint
-LINT_OPTIONS = +unixlib -weak -macrovarprefixexclude -showfunc -linelen 9999
+#  For standard Unix lint
+LINT = lint
+LINT_OPTIONS = -beprxzF
+#  For splint
+#  It doesn't work well, crashes on include files and non-ascii characters.
+#LINT = splint
+#LINT_OPTIONS = +unixlib -weak -macrovarprefixexclude -showfunc -linelen 9999
 
 # PROFILING - Uncomment the next two lines to do profiling with gcc and gprof.
 # Might not work with GUI or Perl.
@@ -1743,7 +1749,8 @@
 # messages.  Don't worry about that.
 # If there is a real error, there will be a difference between "test.out" and
 # a "test99.ok" file.
-# If everything is alright, the final message will be "ALL DONE".
+# If everything is alright, the final message will be "ALL DONE".  If not you
+# get "TEST FAILURE".
 #
 test check:
 	$(MAKE) -f Makefile $(VIMTARGET)
@@ -2427,7 +2434,7 @@
 	$(CCC) -o $@ if_xcmdsrv.c
 
 objects/if_mzsch.o: if_mzsch.c
-	$(CCC) -o $@ if_mzsch.c
+	$(CCC) -o $@ $(MZSCHEME_CFLAGS_EXTRA) if_mzsch.c
 
 objects/if_perl.o: auto/if_perl.c
 	$(CCC) -o $@ auto/if_perl.c
@@ -2436,7 +2443,7 @@
 	$(CCC) -o $@ if_perlsfio.c
 
 objects/if_python.o: if_python.c
-	$(CCC) -o $@ if_python.c
+	$(CCC) -o $@ $(PYTHON_CFLAGS_EXTRA) if_python.c
 
 objects/if_ruby.o: if_ruby.c
 	$(CCC) -o $@ if_ruby.c
diff --git a/src/if_ruby.c b/src/if_ruby.c
index 74de2f0..0fed2c0 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -492,7 +492,7 @@
     }
 }
 
-static VALUE vim_message(VALUE self, VALUE str)
+static VALUE vim_message(VALUE self UNUSED, VALUE str)
 {
     char *buff, *p;
 
@@ -505,20 +505,20 @@
     return Qnil;
 }
 
-static VALUE vim_set_option(VALUE self, VALUE str)
+static VALUE vim_set_option(VALUE self UNUSED, VALUE str)
 {
     do_set((char_u *)STR2CSTR(str), 0);
     update_screen(NOT_VALID);
     return Qnil;
 }
 
-static VALUE vim_command(VALUE self, VALUE str)
+static VALUE vim_command(VALUE self UNUSED, VALUE str)
 {
     do_cmdline_cmd((char_u *)STR2CSTR(str));
     return Qnil;
 }
 
-static VALUE vim_evaluate(VALUE self, VALUE str)
+static VALUE vim_evaluate(VALUE self UNUSED, VALUE str)
 {
 #ifdef FEAT_EVAL
     char_u *value = eval_to_string((char_u *)STR2CSTR(str), NULL, TRUE);
@@ -580,7 +580,7 @@
     return INT2NUM(n);
 }
 
-static VALUE buffer_s_aref(VALUE self, VALUE num)
+static VALUE buffer_s_aref(VALUE self UNUSED, VALUE num)
 {
     buf_T *b;
     int n = NUM2INT(num);
@@ -629,7 +629,9 @@
 	return line ? rb_str_new2(line) : Qnil;
     }
     rb_raise(rb_eIndexError, "index %d out of buffer", n);
+#ifndef __GNUC__
     return Qnil; /* For stop warning */
+#endif
 }
 
 static VALUE buffer_aref(VALUE self, VALUE num)
@@ -668,7 +670,9 @@
     else
     {
 	rb_raise(rb_eIndexError, "index %d out of buffer", n);
+#ifndef __GNUC__
 	return Qnil; /* For stop warning */
+#endif
     }
     return str;
 }
@@ -789,7 +793,7 @@
     return get_buffer_line(curbuf, curwin->w_cursor.lnum);
 }
 
-static VALUE set_current_line(VALUE self, VALUE str)
+static VALUE set_current_line(VALUE self UNUSED, VALUE str)
 {
     return set_buffer_line(curbuf, curwin->w_cursor.lnum, str);
 }
@@ -815,7 +819,7 @@
 #endif
 }
 
-static VALUE window_s_aref(VALUE self, VALUE num)
+static VALUE window_s_aref(VALUE self UNUSED, VALUE num)
 {
     win_T *w;
     int n = NUM2INT(num);
@@ -897,7 +901,7 @@
     return Qnil;
 }
 
-static VALUE f_p(int argc, VALUE *argv, VALUE self)
+static VALUE f_p(int argc, VALUE *argv, VALUE self UNUSED)
 {
     int i;
     VALUE str = rb_str_new("", 0);
diff --git a/src/version.c b/src/version.c
index 2d1ce01..643e8e3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -677,6 +677,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    185,
+/**/
     184,
 /**/
     183,