diff --git a/scripts/publish-macosx.sh b/scripts/publish-macosx.sh
index a2451fa601..a2ded8ada3 100755
--- a/scripts/publish-macosx.sh
+++ b/scripts/publish-macosx.sh
@@ -1,15 +1,20 @@
 #!/bin/sh
 
-VERSION=`date "+%Y.%m.%d"`
+# Set this if we're doing a release build. Comment it out for development builds
 #VERSION=2011.12
 
+if test -z "$VERSION"; then
+  VERSION=`date "+%Y.%m.%d"`
+  COMMIT=-c
+fi
+
 # Turn off ccache, just for safety
 PATH=${PATH//\/opt\/local\/libexec\/ccache:}
 
 # This is the same location as DEPLOYDIR in macosx-build-dependencies.sh
 export OPENSCAD_LIBRARIES=$PWD/../libraries/install
 
-`dirname $0`/release-common.sh -v $VERSION
+`dirname $0`/release-common.sh -v $VERSION $COMMIT
 if [[ $? != 0 ]]; then
   exit 1
 fi
diff --git a/scripts/release-common.sh b/scripts/release-common.sh
index 9f03ee5333..296c14a54b 100755
--- a/scripts/release-common.sh
+++ b/scripts/release-common.sh
@@ -7,16 +7,19 @@
 # The script will create a file called openscad-<versionstring>.zip
 # in the current directory.
 # 
-# Usage: release-common.sh [-v <versionstring>]
+# Usage: release-common.sh [-v <versionstring>] [-c]
 #  -v   Version string (e.g. -v 2010.01)
+#  -c   Build with commit info
 #
 # If no version string is given, todays date will be used (YYYY-MM-DD)
 # If no make target is given, release will be used on Windows, none one Mac OS X
 #
+# The commit info will extracted from git and be passed to qmake as OPENSCAD_COMMIT
+# to identify a build in the about box.
 
 printUsage()
 {
-  echo "Usage: $0 -v <versionstring>
+  echo "Usage: $0 -v <versionstring> -c
   echo
   echo "  Example: $0 -v 2010.01
 }
@@ -29,10 +32,11 @@ fi
 
 echo "Detected OS: $OS"
 
-while getopts 'v:' c
+while getopts 'v:c' c
 do
   case $c in
     v) VERSION=$OPTARG;;
+    c) OPENSCAD_COMMIT=`git log -1 --pretty=format:"%h"`
   esac
 done
 
@@ -66,10 +70,10 @@ esac
 
 case $OS in
     LINXWIN)
-        i686-pc-mingw32-qmake VERSION=$VERSION CONFIG+=$CONFIG CONFIG+=mingw-cross-env CONFIG-=debug openscad.pro
+        i686-pc-mingw32-qmake VERSION=$VERSION OPENSCAD_COMMIT=$OPENSCAD_COMMIT CONFIG+=$CONFIG CONFIG+=mingw-cross-env CONFIG-=debug openscad.pro
     ;;
     *)
-        qmake VERSION=$VERSION CONFIG+=$CONFIG CONFIG-=debug openscad.pro
+        qmake VERSION=$VERSION OPENSCAD_COMMIT=$OPENSCAD_COMMIT CONFIG+=$CONFIG CONFIG-=debug openscad.pro
     ;;
 esac
 
diff --git a/src/mainwin.cc b/src/mainwin.cc
index a8507c0c05..cbfa46aa63 100644
--- a/src/mainwin.cc
+++ b/src/mainwin.cc
@@ -101,7 +101,11 @@ unsigned int GuiLocker::gui_locked = 0;
 #define QUOTED(x__) QUOTE(x__)
 
 static char helptitle[] =
-	"OpenSCAD " QUOTED(OPENSCAD_VERSION) " (www.openscad.org)\n\n";
+	"OpenSCAD " QUOTED(OPENSCAD_VERSION)
+#ifdef OPENSCAD_COMMIT
+	" (git " QUOTED(OPENSCAD_COMMIT) ")"
+#endif
+	"\nhttp://www.openscad.org\n\n";
 static char copyrighttext[] =
 	"Copyright (C) 2009-2011 Marius Kintel <marius@kintel.net> and Clifford Wolf <clifford@clifford.at>\n"
 	"\n"
diff --git a/version.pri b/version.pri
index 6b91ecdcfd..e490d7dc00 100644
--- a/version.pri
+++ b/version.pri
@@ -66,3 +66,7 @@ VERSION_DAY=$${VERSION_DAY}.0
 
 DEFINES += OPENSCAD_VERSION=$$VERSION OPENSCAD_YEAR=$$VERSION_YEAR OPENSCAD_MONTH=$$VERSION_MONTH
 !isEmpty(VERSION_DAY): DEFINES += OPENSCAD_DAY=$$VERSION_DAY
+
+!isEmpty(OPENSCAD_COMMIT) {
+  DEFINES += OPENSCAD_COMMIT=$$OPENSCAD_COMMIT
+}