new file mode 100644
--- /dev/null
+++ b/runtime/syntax/prolog.vim
@@ -0,0 +1,120 @@
+" Vim syntax file
+" Language:    PROLOG
+" Maintainers: Ralph Becket <rwab1@cam.sri.co.uk>,
+"	       Thomas Koehler <jean-luc@picard.franken.de>
+" Last Change: 2003 May 11
+" URL:	       http://jeanluc-picard.de/vim/syntax/prolog.vim
+
+" There are two sets of highlighting in here:
+" If the "prolog_highlighting_clean" variable exists, it is rather sparse.
+" Otherwise you get more highlighting.
+
+" Quit when a syntax file was already loaded
+if version < 600
+   syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+" Prolog is case sensitive.
+syn case match
+
+" Very simple highlighting for comments, clause heads and
+" character codes.  It respects prolog strings and atoms.
+
+syn region   prologCComment	start=+/\*+ end=+\*/+
+syn match    prologComment	+%.*+
+
+syn keyword  prologKeyword	module meta_predicate multifile dynamic
+syn match    prologCharCode	+0'\\\=.+
+syn region   prologString	start=+"+ skip=+\\"+ end=+"+
+syn region   prologAtom		start=+'+ skip=+\\'+ end=+'+
+syn region   prologClauseHead   start=+^[a-z][^(]*(+ skip=+\.[^			    ]+ end=+:-\|\.$\|\.[	]\|-->+
+
+if !exists("prolog_highlighting_clean")
+
+  " some keywords
+  " some common predicates are also highlighted as keywords
+  " is there a better solution?
+  syn keyword prologKeyword   abolish current_output  peek_code
+  syn keyword prologKeyword   append  current_predicate       put_byte
+  syn keyword prologKeyword   arg     current_prolog_flag     put_char
+  syn keyword prologKeyword   asserta fail    put_code
+  syn keyword prologKeyword   assertz findall read
+  syn keyword prologKeyword   at_end_of_stream	      float   read_term
+  syn keyword prologKeyword   atom    flush_output    repeat
+  syn keyword prologKeyword   atom_chars      functor retract
+  syn keyword prologKeyword   atom_codes      get_byte	      set_input
+  syn keyword prologKeyword   atom_concat     get_char	      set_output
+  syn keyword prologKeyword   atom_length     get_code	      set_prolog_flag
+  syn keyword prologKeyword   atomic  halt    set_stream_position
+  syn keyword prologKeyword   bagof   integer setof
+  syn keyword prologKeyword   call    is      stream_property
+  syn keyword prologKeyword   catch   nl      sub_atom
+  syn keyword prologKeyword   char_code       nonvar  throw
+  syn keyword prologKeyword   char_conversion number  true
+  syn keyword prologKeyword   clause  number_chars    unify_with_occurs_check
+  syn keyword prologKeyword   close   number_codes    var
+  syn keyword prologKeyword   compound	      once    write
+  syn keyword prologKeyword   copy_term       op      write_canonical
+  syn keyword prologKeyword   current_char_conversion open    write_term
+  syn keyword prologKeyword   current_input   peek_byte       writeq
+  syn keyword prologKeyword   current_op      peek_char
+
+  syn match   prologOperator "=\\=\|=:=\|\\==\|=<\|==\|>=\|\\=\|\\+\|<\|>\|="
+  syn match   prologAsIs     "===\|\\===\|<=\|=>"
+
+  syn match   prologNumber	      "\<[0123456789]*\>"
+  syn match   prologCommentError      "\*/"
+  syn match   prologSpecialCharacter  ";"
+  syn match   prologSpecialCharacter  "!"
+  syn match   prologQuestion	      "?-.*\."	contains=prologNumber
+
+
+endif
+
+syn sync ccomment maxlines=50
+
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_prolog_syn_inits")
+  if version < 508
+    let did_prolog_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  " The default highlighting.
+  HiLink prologComment		Comment
+  HiLink prologCComment		Comment
+  HiLink prologCharCode		Special
+
+  if exists ("prolog_highlighting_clean")
+
+    HiLink prologKeyword	Statement
+    HiLink prologClauseHead	Statement
+
+  else
+
+    HiLink prologKeyword	Keyword
+    HiLink prologClauseHead	Constant
+    HiLink prologQuestion	PreProc
+    HiLink prologSpecialCharacter Special
+    HiLink prologNumber		Number
+    HiLink prologAsIs		Normal
+    HiLink prologCommentError	Error
+    HiLink prologAtom		String
+    HiLink prologString		String
+    HiLink prologOperator	Operator
+
+  endif
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "prolog"
+
+" vim: ts=8