Add debian package

cmake/Version.cmake

@@ -22,7 +22,8 @@ if(STRAWBERRY_VERSION_PRERELEASE)
   set(STRAWBERRY_VERSION_PACKAGE "${STRAWBERRY_VERSION_PACKAGE}${STRAWBERRY_VERSION_PRERELEASE}")
 endif(STRAWBERRY_VERSION_PRERELEASE)
 
-if(INCLUDE_GIT_REVISION)
+
+if(INCLUDE_GIT_REVISION AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
 
   find_program(GIT_EXECUTABLE git)
   if(GIT_EXECUTABLE-NOTFOUND)
@@ -48,6 +49,14 @@ if(INCLUDE_GIT_REVISION)
     ERROR_QUIET
   )
 
+endif()
+
+if(FORCE_GIT_REVISION)
+  set(GIT_REVISION ${FORCE_GIT_REVISION})
+endif()
+
+if(GIT_REVISION)
+
   if(NOT ${GIT_CMD_RESULT_REVISION} EQUAL 0)
     message(FATAL_ERROR "GIT command failed to get revision string '${GIT_REVISION}'")
   endif()