Don't try to define the git version of the release.

--- luminance-hdr-2.3.1/CMakeLists.txt
+++ luminance-hdr-2.3.1/CMakeLists.txt
@@ -32,12 +32,6 @@
     ${QT_QTCORE_LIBRARIES} ${QT_QTGUI_LIBRARIES} ${QT_QTNETWORK_LIBRARIES}
     ${QT_QTWEBKIT_LIBRARIES} ${QT_QTXML_LIBRARIES} ${QT_QTSQL_LIBRARIES})
 
-FIND_PACKAGE(Git)
-IF(GIT_FOUND)
-    include(GetGitRevisionDescription)
-    get_git_head_revision(GIT_REFSPEC GIT_SHA1)
-ENDIF()
-
 IF(WIN32)
     # Windows Section
     
--- luminance-hdr-2.3.1.orig/src/Common/CMakeLists.txt
+++ luminance-hdr-2.3.1/src/Common/CMakeLists.txt
@@ -1,5 +1,3 @@
-CONFIGURE_FILE( ${CMAKE_CURRENT_SOURCE_DIR}/GitSHA1.cpp.in
-                ${CMAKE_CURRENT_BINARY_DIR}/GitSHA1.cpp @ONLY)
 CONFIGURE_FILE( ${CMAKE_CURRENT_SOURCE_DIR}/global.hxx.in
                 ${CMAKE_CURRENT_BINARY_DIR}/global.hxx @ONLY)
 CONFIGURE_FILE( ${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
@@ -32,8 +30,7 @@
 
 ADD_LIBRARY(common ${FILES_H} ${FILES_CPP} ${FILES_MOC} ${FILES_HXX} ${FILES_UI_H}
     ${CMAKE_CURRENT_BINARY_DIR}/global.hxx
-    ${CMAKE_CURRENT_BINARY_DIR}/config.h
-    ${CMAKE_CURRENT_BINARY_DIR}/GitSHA1.cpp)
+    ${CMAKE_CURRENT_BINARY_DIR}/config.h)
 
 SET(FILES_TO_TRANSLATE ${FILES_TO_TRANSLATE} ${FILES_CPP} ${FILES_H} ${FILES_UI} ${FILES_HXX} PARENT_SCOPE)
 SET(LUMINANCE_MODULES_GUI ${LUMINANCE_MODULES_GUI} common PARENT_SCOPE)
--- luminance-hdr-2.3.1.orig/src/UI/UMessageBox.cpp
+++ luminance-hdr-2.3.1/src/UI/UMessageBox.cpp
@@ -28,7 +28,6 @@
 
 #include "UI/UMessageBox.h"
 
-#include "Common/GitSHA1.h"
 #include "Common/config.h"
 #include "Common/archs.h"
 #include "ui_about.h"
@@ -92,7 +91,7 @@
     ui.authorsBox->setOpenExternalLinks(true);
     ui.thanksToBox->setOpenExternalLinks(true);
     ui.GPLbox->setTextInteractionFlags(Qt::TextSelectableByMouse);
-    ui.label_version->setText(ui.label_version->text().append(QString(LUMINANCEVERSION)).append(" [Build ").append(QString(g_GIT_SHA1).left(6)).append("]"));
+    ui.label_version->setText(ui.label_version->text().append(QString(LUMINANCEVERSION)));
 
     bool license_file_not_found=true;
     QString docDir = QCoreApplication::applicationDirPath();