diff --git a/VERSION b/VERSION
index 27df921e8..ad7e0dd67 100644
--- a/VERSION
+++ b/VERSION
@@ -1,5 +1,5 @@
 gregoriotex_api_version = 20150220
-gregorio_version = 2.4.1
+gregorio_version = 2.4.2
 
 *** Do not add any lines above here. ***
 
diff --git a/configure.ac b/configure.ac
index ef09fcb9c..c19f33305 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,7 @@ dnl You should have received a copy of the GNU General Public License
 dnl along with this program; if not, write to the Free Software
 dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-AC_INIT([gregorio],[2.4.1],[gregorio-devel@gna.org])
+AC_INIT([gregorio],[2.4.2],[gregorio-devel@gna.org])
 AC_PREREQ(2.53)
 AC_CONFIG_SRCDIR([src/gregorio-utils.c])
 AC_CONFIG_AUX_DIR([build-aux])
diff --git a/tex/gregoriotex.lua b/tex/gregoriotex.lua
index 916af3ace..536125ecb 100644
--- a/tex/gregoriotex.lua
+++ b/tex/gregoriotex.lua
@@ -174,35 +174,47 @@ local function atScoreEnd ()
     end
 end
 
-local function compile_gabc(gabc_file, tex_file)
+local function compile_gabc(gabc_file, gtex_file)
     info("compiling the score %s...", gabc_file)
-    res = os.execute(string.format("gregorio -o %s %s", tex_file, gabc_file))
+    res = os.execute(string.format("gregorio -o %s %s", gtex_file, gabc_file))
     if res == nil then
         err("\nSomething went wrong when executing\n    'gregorio -o %s %s'.\n"
-        .."shell-escape mode may not be activated. Try\n    '%s --shell-escape %s.tex'\nSee the documentation of gregorio or your TeX\ndistribution to automatize it.", tex_file, gabc_file, tex.formatname, tex.jobname)
+        .."shell-escape mode may not be activated. Try\n    '%s --shell-escape %s.tex'\nSee the documentation of gregorio or your TeX\ndistribution to automatize it.", gtex_file, gabc_file, tex.formatname, tex.jobname)
     elseif res ~= 0 then
         err("\nAn error occured when compiling the score file\n'%s' with gregorio.\nPlease check your score file.", gabc_file)
     end
 end
 
-local function include_gabc_score(gabc_file)
-    if not lfs.isfile(gabc_file) then
-        err("the file %s does not exist.", gabc_file)
-        return
+local function include_score(input_file)
+    local file_root = ""
+    if input_file:gmatch("%.gtex+$") then
+	file_root = input_file:gsub("%.gtex+$", "")
+    elseif input_file:gmatch("%.tex+$") then
+	file_root = input_file:gsub("%.tex+$", "")
+    elseif input_file:gmatch("%.gabc+$") then
+	file_root = input_file:gsub("%.gabc+$", "")
+    else
+	file_root = input_file
+    end
+    local gtex_file = file_root.."-"..internalversion..".gtex"
+    local gabc_file = file_root..".gabc"
+    if not lfs.isfile(gtex_file) then
+	log("The file %s does not exist. Searching for a gabc file", gtex_file)
+	if lfs.isfile(gabc_file) then
+	    compile_gabc(gabc_file, gtex_file)
+	else
+	    err("The file %s does not exist.", gabc_file)
+	    return
+	end
     end
+    local gtex_timestamp = lfs.attributes(gtex_file).modification
     local gabc_timestamp = lfs.attributes(gabc_file).modification
-    local tex_file = gabc_file:gsub("%.gabc+$","-auto.gtex")
-    if lfs.isfile(tex_file) then
-        local tex_timestamp = lfs.attributes(tex_file).modification
-        if tex_timestamp < gabc_timestamp then
-            gregoriotex.compile_gabc(gabc_file, tex_file)
-        else
-            log("using the file %s without recompiling, as %s hasn't changed since last compilation.", tex_file, gabc_file)
-        end
-    else
-        compile_gabc(gabc_file, tex_file)
+    if gtex_timestamp < gabc_timestamp then
+	log("%s has been modified and %s needs to be updated. Recompiling the gabc file.", gabc_file, gtex_file)
+	compile_gabc(gabc_file, gtex_file)
     end
-    tex.print(string.format("\\input %s", tex_file))
+    tex.print(string.format("\\input %s", gtex_file))
+    return
 end
 
 local function check_version(greinternalversion)
@@ -215,7 +227,7 @@ local function get_greapiversion()
     return internalversion
 end
 
-gregoriotex.include_gabc_score = include_gabc_score
+gregoriotex.include_score      = include_score
 gregoriotex.compile_gabc       = compile_gabc
 gregoriotex.atScoreEnd         = atScoreEnd
 gregoriotex.atScoreBeggining   = atScoreBeggining
diff --git a/tex/gregoriotex.tex b/tex/gregoriotex.tex
index 228d5c3d9..3506269ff 100644
--- a/tex/gregoriotex.tex
+++ b/tex/gregoriotex.tex
@@ -1364,45 +1364,68 @@
 %% score including
 %%%%%%%%%%%%%%%%%%
 
-% function that includes a score in TeX format
-\def\gre@includetexscore#1{%
-	\input #1%
-	\relax %
+% The primary macro that includes a score. The lua function check that:
+%  -- The gtex file exists.
+%  -- The gtex file is of the correct gregoriotexapi_version.
+%  -- The gtex file is 'newer' than it's corresponding gabc file.
+% If either test fails, the gabc file is (re)compiled.
+
+\def\gre@includescore#1{%
+  \directlua{gregoriotex.include_score([[#1]])}%
+  \relax%
 }
+
 \ifdefined\includetexscore
-	\greerror{\protect\includetexscore\space is already defined.  Check for package conflicts.}
+	\gre@warning{\protect\includetexscore\space is deprecated. \MessageBreak Use \protect\includescore\space instead.}
 \else
 	\def\includetexscore#1{%
-		\gre@includetexscore{#1}
+		\gre@includescore{#1}
 	}
 \fi
 \def\greincludetexscore#1{%
 	\gre@warning{\protect\greincludedtexscore\space is deprecated.\MessageBreak Use \protect\includescore\space instead.}
-	\gre@includetexscore{#1}
+	\gre@includescore{#1}
 }
 
-% function that includes scores in gabc format
-\def\gre@includegabcscore#1{%
-	\directlua{gregoriotex.include_gabc_score([[#1]])}%
-	\relax %
-}
 \ifdefined\includegabcscore
-	\greerror{\protect\includegabcscore\space is already defined.  Check for package conflicts.}
+	\gre@warning{\protect\includegabcscore\space is deprecated.\MessageBreak Use \protect\includescore\space instead.}
 \else
 	\def\includegabcscore#1{%
-		\gre@includegabcscore{#1}
+		\gre@includescore{#1}
 	}
 \fi
 \def\greincludegabcscore#1{%
 	\gre@warning{\protect\greincludedgabcscore\space is deprecated.\MessageBreak Use \protect\includescore\space instead.}
-	\gre@includegabcscore{#1}
+	\gre@includescore{#1}
 }
 
-% Wrapper function that can handle both file types.  This is done by checking the filename (using the string tests from the xstring package) to see if it ends with .gabc.  If it does, we assume the file is in gabc format and pass it to \ger@includegabcscore.  All other files are assumed to be in gtex format and are processed using \gre@includetexscore.
-\def\includescore#1{%
-	\IfEndWith{#1}{.gabc}{\gre@includegabcscore{#1}}{\gre@includetexscore{#1}}
+% A macro that passes the score directly to TeX without performing the API version check or if the gabc was modified since the creation of the gtex file.
+\def\gre@includescorewithoption[#1]#2{%
+  \input #2%
+  \relax%
 }
 
+% The main macro used by the user to input scores into the document.
+
+\def\includescore{\@ifnextchar[{\gre@includescorewithoption}%
+    {\gre@includescore}%
+}
+
+% If called without the optional argument: '\includescore{Antiphon}'
+% the filename will be passed to the lua function 'include_score'
+% which will check: whether the gtex file exists, if the API version
+% of the gtex file, or if the gabc file is newer than the gtex
+% file. If one of these tests fails, the gabc file will be
+% (re)compiled.
+% The argument may or may not include a file extension. These are all valid:
+% '\includescore{Antiphon}' or '\includescore{Antiphon.gabc}' or
+% '\includescore{Antiphon.gtex}'
+
+% If called with the optional argument: '\includescore[f]{Antiphon.gtex}'
+% the gtex file will be forced into the document and will not be
+% checked by the lua function 'include_score'. This does not bypass
+% the API version test done by '\gregoriotexapiversion'.
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%
 %% some hyphen definitions
 %%%%%%%%%%%%%%%%%%%%%%%%%%
diff --git a/windows/gregorio.iss b/windows/gregorio.iss
index ce864505b..74d081f48 100644
--- a/windows/gregorio.iss
+++ b/windows/gregorio.iss
@@ -1,6 +1,6 @@
 [Setup]
 AppName=gregorio
-AppVersion=2.4.1
+AppVersion=2.4.2
 DefaultDirName={pf}\gregorio
 DefaultGroupName=gregorio
 SetupIconFile=gregorio.ico