diff --git a/runtime/compiler/mcs.vim b/runtime/compiler/mcs.vim
new file mode 100644
index 0000000..d85da7d
--- /dev/null
+++ b/runtime/compiler/mcs.vim
@@ -0,0 +1,24 @@
+" Vim compiler file
+" Compiler:    Mono C# Compiler
+" Maintainer:  Jarek Sobiecki <harijari@go2.pl>
+" Latest Revision: 2006-06-18
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "mcs"
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+setlocal errorformat=
+         \%E%f(%l\\,%c):\ error\ CS%n:%m,
+         \%W%f(%l\\,%c):\ warning\ CS%n:%m,
+         \%E%>syntax\ error\\,%m,%Z%f(%l\\,%c):\ error\ CS%n:%m,
+         \%D%*\\a[%*\\d]:\ Entering\ directory\ `%f',
+         \%X%*\\a[%*\\d]:\ Leaving\ directory\ `%f',
+         \%DMaking\ %*\\a\ in\ %f,
+         \%G-%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save