diff --git a/runtime/syntax/dcl.vim b/runtime/syntax/dcl.vim
index 2258ff6..73df8e1 100644
--- a/runtime/syntax/dcl.vim
+++ b/runtime/syntax/dcl.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	DCL (Digital Command Language - vms)
 " Maintainer:	Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change:	Aug 31, 2016
-" Version:	11
+" Last Change:	Mar 26, 2019
+" Version:	12
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_DCL
 
 " quit when a syntax file was already loaded
@@ -10,10 +10,10 @@
   finish
 endif
 
-if !has("patch-7.4.1142")
-  setlocal iskeyword=$,@,48-57,_
-else
+if (v:version == 704 && has("patch-7.4.1142")) || v:version > 704
  syn iskeyword $,@,48-57,_
+else
+ setlocal iskeyword=$,@,48-57,_
 endif
 
 syn case ignore
diff --git a/runtime/syntax/lisp.vim b/runtime/syntax/lisp.vim
index b6aa04b..d99e032 100644
--- a/runtime/syntax/lisp.vim
+++ b/runtime/syntax/lisp.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:    Lisp
 " Maintainer:  Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change: Feb 15, 2018
-" Version:     27
+" Last Change: Mar 26, 2019
+" Version:     28
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_LISP
 "
 "  Thanks to F Xavier Noria for a list of 978 Common Lisp symbols taken from HyperSpec
@@ -16,10 +16,10 @@
 
 if exists("g:lisp_isk")
  exe "setl isk=".g:lisp_isk
-elseif !has("patch-7.4.1142")
- setl isk=38,42,43,45,47-58,60-62,64-90,97-122,_
-else
+elseif (v:version == 704 && has("patch-7.4.1142")) || v:version > 704
  syn iskeyword 38,42,43,45,47-58,60-62,64-90,97-122,_
+else
+ setl isk=38,42,43,45,47-58,60-62,64-90,97-122,_
 endif
 
 if exists("g:lispsyntax_ignorecase") || exists("g:lispsyntax_clisp")
diff --git a/runtime/syntax/make.vim b/runtime/syntax/make.vim
index 16e66bc..377e4450 100644
--- a/runtime/syntax/make.vim
+++ b/runtime/syntax/make.vim
@@ -3,7 +3,7 @@
 " Maintainer:	Roland Hieber <rohieb+vim-iR0jGdkV@rohieb.name>
 " Previous Maintainer:	Claudio Fleiner <claudio@fleiner.com>
 " URL:		https://github.com/vim/vim/syntax/make.vim
-" Last Change:	2019 Feb 08
+" Last Change:	2019 Apr 02
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -19,7 +19,7 @@
 syn match makeNextLine	"\\\n\s*"
 
 " some directives
-syn match makePreCondit	"^ *\(ifeq\>\|else\>\|endif\>\|ifneq\>\|ifdef\>\|ifndef\>\)"
+syn match makePreCondit	"^ *\(ifn\=\(eq\|def\)\>\|else\(\s\+ifn\=\(eq\|def\)\)\=\>\|endif\>\)"
 syn match makeInclude	"^ *[-s]\=include"
 syn match makeStatement	"^ *vpath"
 syn match makeExport    "^ *\(export\|unexport\)\>"
@@ -32,8 +32,8 @@
 
 " Microsoft Makefile specials
 syn case ignore
-syn match makeInclude	"^! *include"
-syn match makePreCondit "! *\(cmdswitches\|error\|message\|include\|if\|ifdef\|ifndef\|else\|elseif\|else if\|else\s*ifdef\|else\s*ifndef\|endif\|undef\)\>"
+syn match makeInclude	"^!\s*include"
+syn match makePreCondit "^!\s*\(cmdswitches\|error\|message\|include\|if\|ifdef\|ifndef\|else\|else\s*if\|else\s*ifdef\|else\s*ifndef\|endif\|undef\)\>"
 syn case match
 
 " identifiers
@@ -101,17 +101,17 @@
 " Define the default highlighting.
 " Only when an item doesn't have highlighting yet
 
-hi def link makeNextLine		makeSpecial
+hi def link makeNextLine	makeSpecial
 hi def link makeCmdNextLine	makeSpecial
-hi def link makeSpecTarget		Statement
+hi def link makeSpecTarget	Statement
 if !exists("make_no_commands")
-hi def link makeCommands		Number
+hi def link makeCommands	Number
 endif
-hi def link makeImplicit		Function
+hi def link makeImplicit	Function
 hi def link makeTarget		Function
 hi def link makeInclude		Include
-hi def link makePreCondit		PreCondit
-hi def link makeStatement		Statement
+hi def link makePreCondit	PreCondit
+hi def link makeStatement	Statement
 hi def link makeIdent		Identifier
 hi def link makeSpecial		Special
 hi def link makeComment		Comment
diff --git a/runtime/syntax/maple.vim b/runtime/syntax/maple.vim
index 1261ff5..f14cf79 100644
--- a/runtime/syntax/maple.vim
+++ b/runtime/syntax/maple.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	Maple V (based on release 4)
 " Maintainer:	Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change:	Aug 31, 2016
-" Version:	15
+" Last Change:	Mar 26, 2019
+" Version:	16
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_MAPLE
 "
 " Package Function Selection: {{{1
@@ -27,10 +27,10 @@
 endif
 
 " Iskeyword Effects: {{{1
-if !has("patch-7.4.1142")
- setl isk=$,48-57,_,a-z,@-Z
-else
+if (v:version == 704 && has("patch-7.4.1142")) || v:version > 704
  syn iskeyword $,48-57,_,a-z,@-Z
+else
+ setl isk=$,48-57,_,a-z,@-Z
 endif
 
 " Package Selection: {{{1
diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index 9eed594..b9c71de 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -2,8 +2,8 @@
 " Language:		shell (sh) Korn shell (ksh) bash (sh)
 " Maintainer:		Charles E. Campbell  <NdrOchipS@PcampbellAfamily.Mbiz>
 " Previous Maintainer:	Lennart Schultz <Lennart.Schultz@ecmwf.int>
-" Last Change:		Nov 23, 2018
-" Version:		185
+" Last Change:		Mar 26, 2019
+" Version:		186
 " URL:		http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
 " For options and settings, please use:      :help ft-sh-syntax
 " This file includes many ideas from Eric Brunet (eric.brunet@ens.fr)
@@ -89,7 +89,7 @@
 endif
 
 " set up the syntax-highlighting iskeyword
-if has("patch-7.4.1142")
+if (v:version == 704 && has("patch-7.4.1142")) || v:version > 704
  if exists("b:is_bash")
   exe "syn iskeyword ".&iskeyword.",-,:"
  else
diff --git a/runtime/syntax/tex.vim b/runtime/syntax/tex.vim
index 3969cd4..6381028 100644
--- a/runtime/syntax/tex.vim
+++ b/runtime/syntax/tex.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	TeX
 " Maintainer:	Charles E. Campbell <NdrchipO@ScampbellPfamily.AbizM>
-" Last Change:	Nov 02, 2018
-" Version:	111
+" Last Change:	Apr 01, 2019
+" Version:	113
 " URL:		http://www.drchip.org/astronaut/vim/index.html#SYNTAX_TEX
 "
 " Notes: {{{1
@@ -127,7 +127,7 @@
 else
  let b:tex_isk="48-57,a-z,A-Z,192-255"
 endif
-if v:version > 704 || (v:version == 704 && has("patch-7.4.1142"))
+if (v:version == 704 && has("patch-7.4.1142")) || v:version > 704
  exe "syn iskeyword ".b:tex_isk
 else
  exe "setl isk=".b:tex_isk
@@ -155,9 +155,9 @@
  syn cluster texCmdGroup		add=texMathError
 endif
 syn cluster texEnvGroup			contains=texMatcher,texMathDelim,texSpecialChar,texStatement
-syn cluster texFoldGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texInputFile,texLength,texLigature,texMatcher,texMathZoneV,texMathZoneW,texMathZoneX,texMathZoneY,texMathZoneZ,texNewCmd,texNewEnv,texOnlyMath,texOption,texParen,texRefZone,texSection,texBeginEnd,texSectionZone,texSpaceCode,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,@texMathZones,texTitle,texAbstract,texBoldStyle,texItalStyle,texNoSpell
+syn cluster texFoldGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texInputFile,texLength,texLigature,texMatcher,texMathZoneV,texMathZoneW,texMathZoneX,texMathZoneY,texMathZoneZ,texNewCmd,texNewEnv,texOnlyMath,texOption,texParen,texRefZone,texSection,texBeginEnd,texSectionZone,texSpaceCode,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,@texMathZones,texTitle,texAbstract,texBoldStyle,texItalStyle,texEmphStyle,texNoSpell
 syn cluster texBoldGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texInputFile,texLength,texLigature,texMatcher,texMathZoneV,texMathZoneW,texMathZoneX,texMathZoneY,texMathZoneZ,texNewCmd,texNewEnv,texOnlyMath,texOption,texParen,texRefZone,texSection,texBeginEnd,texSectionZone,texSpaceCode,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,@texMathZones,texTitle,texAbstract,texBoldStyle,texBoldItalStyle,texNoSpell
-syn cluster texItalGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texInputFile,texLength,texLigature,texMatcher,texMathZoneV,texMathZoneW,texMathZoneX,texMathZoneY,texMathZoneZ,texNewCmd,texNewEnv,texOnlyMath,texOption,texParen,texRefZone,texSection,texBeginEnd,texSectionZone,texSpaceCode,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,@texMathZones,texTitle,texAbstract,texItalStyle,texItalBoldStyle,texNoSpell
+syn cluster texItalGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texInputFile,texLength,texLigature,texMatcher,texMathZoneV,texMathZoneW,texMathZoneX,texMathZoneY,texMathZoneZ,texNewCmd,texNewEnv,texOnlyMath,texOption,texParen,texRefZone,texSection,texBeginEnd,texSectionZone,texSpaceCode,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,@texMathZones,texTitle,texAbstract,texItalStyle,texEmphStyle,texItalBoldStyle,texNoSpell
 if !s:tex_nospell
  syn cluster texMatchGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMatcher,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texBoldStyle,texBoldItalStyle,texItalStyle,texItalBoldStyle,texZone,texInputFile,texOption,@Spell
  syn cluster texMatchNMGroup		contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMatcherNM,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texBoldStyle,texBoldItalStyle,texItalStyle,texItalBoldStyle,texZone,texInputFile,texOption,@Spell
@@ -301,6 +301,7 @@
 if s:tex_conceal !~# 'b'
  syn match texTypeStyle		"\\textbf\>"
  syn match texTypeStyle		"\\textit\>"
+ syn match texTypeStyle		"\\emph\>"
 endif
 syn match texTypeStyle		"\\textmd\>"
 syn match texTypeStyle		"\\textrm\>"
@@ -309,7 +310,6 @@
 syn match texTypeStyle		"\\textsl\>"
 syn match texTypeStyle		"\\texttt\>"
 syn match texTypeStyle		"\\textup\>"
-syn match texTypeStyle		"\\emph\>"
 
 syn match texTypeStyle		"\\mathbb\>"
 syn match texTypeStyle		"\\mathbf\>"
@@ -385,11 +385,13 @@
     syn region texBoldItalStyle	matchgroup=texTypeStyle start="\\textit\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texItalGroup,@Spell
     syn region texItalStyle	matchgroup=texTypeStyle start="\\textit\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texItalGroup,@Spell
     syn region texItalBoldStyle	matchgroup=texTypeStyle start="\\textbf\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texBoldGroup,@Spell
+    syn region texEmphStyle	matchgroup=texTypeStyle start="\\emph\s*{"   matchgroup=texTypeStyle  end="}" concealends contains=@texItalGroup,@Spell
    else                                                                                              
     syn region texBoldStyle	matchgroup=texTypeStyle start="\\textbf\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texBoldGroup
     syn region texBoldItalStyle	matchgroup=texTypeStyle start="\\textit\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texItalGroup
     syn region texItalStyle	matchgroup=texTypeStyle start="\\textit\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texItalGroup
     syn region texItalBoldStyle	matchgroup=texTypeStyle start="\\textbf\s*{" matchgroup=texTypeStyle  end="}" concealends contains=@texBoldGroup
+    syn region texEmphStyle	matchgroup=texTypeStyle start="\\emph\s*{"   matchgroup=texTypeStyle  end="}" concealends contains=@texItalGroup
    endif
   endif
 endif
@@ -790,6 +792,8 @@
     \ ['propto'		, '∝'],
     \ ['rceil'		, '⌉'],
     \ ['Re'		, 'ℜ'],
+    \ ['quad'		, ' '],
+    \ ['qquad'		, ' '],
     \ ['rfloor'		, '⌋'],
     \ ['right)'		, ')'],
     \ ['right]'		, ']'],
@@ -1228,6 +1232,7 @@
   hi texItalStyle		gui=italic	cterm=italic
   hi texBoldItalStyle		gui=bold,italic cterm=bold,italic
   hi texItalBoldStyle		gui=bold,italic cterm=bold,italic
+  hi def link texEmphStyle	texItalStyle
   hi def link texCite		texRefZone
   hi def link texDefCmd		texDef
   hi def link texDefName	texDef
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index ae7983f..b6ac6b5 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	Vim 8.0 script
 " Maintainer:	Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change:	Sep 26, 2018
-" Version:	8.0-20
+" Last Change:	Mar 08, 2019
+" Version:	8.0-21
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_VIM
 " Automatically generated keyword lists: {{{1
 
@@ -217,7 +217,7 @@
 " =========
 syn cluster	vimOperGroup	contains=vimEnvvar,vimFunc,vimFuncVar,vimOper,vimOperParen,vimNumber,vimString,vimRegister,vimContinue
 syn match	vimOper	"\%#=1\(==\|!=\|>=\|<=\|=\~\|!\~\|>\|<\|=\)[?#]\{0,2}"	skipwhite nextgroup=vimString,vimSpecFile
-syn match	vimOper	"\(\<is\>\|\<isnot\>\)[?#]\{0,2}"		skipwhite nextgroup=vimString,vimSpecFile
+syn match	vimOper	"\(\<is\|\<isnot\)[?#]\{0,2}\>"		skipwhite nextgroup=vimString,vimSpecFile
 syn match	vimOper	"||\|&&\|[-+.]"			skipwhite nextgroup=vimString,vimSpecFile
 syn region	vimOperParen 	matchgroup=vimParenSep	start="(" end=")" contains=@vimOperGroup
 syn region	vimOperParen	matchgroup=vimSep		start="{" end="}" contains=@vimOperGroup nextgroup=vimVar,vimFuncVar
diff --git a/runtime/syntax/yacc.vim b/runtime/syntax/yacc.vim
index 01e342e..8e4a225 100644
--- a/runtime/syntax/yacc.vim
+++ b/runtime/syntax/yacc.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	Yacc
 " Maintainer:	Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change:	Aug 31, 2016
-" Version:	15
+" Last Change:	Mar 25, 2019
+" Version:	16
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_YACC
 "
 " Options: {{{1
@@ -43,12 +43,12 @@
 
 " ---------------------------------------------------------------------
 "  Yacc Sections: {{{1
-SynFold syn	region	yaccInit	start='.'ms=s-1,rs=s-1	matchgroup=yaccSectionSep	end='^%%$'me=e-2,re=e-2	contains=@yaccInitCluster	nextgroup=yaccRules	skipwhite skipempty contained
-SynFold syn	region	yaccInit2      start='\%^.'ms=s-1,rs=s-1	matchgroup=yaccSectionSep	end='^%%$'me=e-2,re=e-2	contains=@yaccInitCluster	nextgroup=yaccRules	skipwhite skipempty
-SynFold syn	region	yaccHeader2	matchgroup=yaccSep	start="^\s*\zs%{"	end="^\s*%}"		contains=@yaccCode	nextgroup=yaccInit	skipwhite skipempty contained
-SynFold syn	region	yaccHeader	matchgroup=yaccSep	start="^\s*\zs%{"	end="^\s*%}"		contains=@yaccCode	nextgroup=yaccInit	skipwhite skipempty
-SynFold syn	region	yaccRules	matchgroup=yaccSectionSep	start='^%%$'		end='^%%$'me=e-2,re=e-2	contains=@yaccRulesCluster	nextgroup=yaccEndCode	skipwhite skipempty contained
-SynFold syn	region	yaccEndCode	matchgroup=yaccSectionSep	start='^%%$'		end='\%$'		contains=@yaccCode	contained
+SynFold syn	region	yaccInit	start='.'ms=s-1,rs=s-1	matchgroup=yaccSectionSep		end='^%%\ze\(\s*/[*/].*\)\=$'me=e-2,re=e-2	contains=@yaccInitCluster	nextgroup=yaccRules	skipwhite skipempty contained
+SynFold syn	region	yaccInit2      start='\%^.'ms=s-1,rs=s-1	matchgroup=yaccSectionSep		end='^%%\ze\(\s*/[*/].*\)\=$'me=e-2,re=e-2	contains=@yaccInitCluster	nextgroup=yaccRules	skipwhite skipempty
+SynFold syn	region	yaccHeader2	matchgroup=yaccSep	start="^\s*\zs%{"		end="^\s*%}"			contains=@yaccCode	nextgroup=yaccInit	skipwhite skipempty contained
+SynFold syn	region	yaccHeader	matchgroup=yaccSep	start="^\s*\zs%{"		end="^\s*%}"			contains=@yaccCode	nextgroup=yaccInit	skipwhite skipempty
+SynFold syn	region	yaccRules	matchgroup=yaccSectionSep	start='^%%\ze\(\s*/[*/].*\)\=$'	end='^%%\ze\(\s*/[*/].*\)\=$'me=e-2,re=e-2	contains=@yaccRulesCluster	nextgroup=yaccEndCode	skipwhite skipempty contained
+SynFold syn	region	yaccEndCode	matchgroup=yaccSectionSep	start='^%%\ze\(\s*/[*/].*\)\=$'	end='\%$'			contains=@yaccCode	contained
 
 " ---------------------------------------------------------------------
 " Yacc Commands: {{{1
@@ -72,6 +72,7 @@
 
 SynFold syn	region	yaccNonterminal	start="^\s*\a\w*\ze\_s*\(/\*\_.\{-}\*/\)\=\_s*:"	matchgroup=yaccDelim end=";"	matchgroup=yaccSectionSep end='^%%$'me=e-2,re=e-2 contains=yaccAction,yaccDelim,yaccString,yaccComment	contained
 syn	region	yaccComment	start="/\*"	end="\*/"
+syn	region	yaccComment	start="//"	end="$"
 syn	match	yaccString	"'[^']*'"	contained