Index: src/celeste/CMakeLists.txt
--- src/celeste/CMakeLists.txt.orig
+++ src/celeste/CMakeLists.txt
@@ -17,7 +17,7 @@
 #    along with Hugin  If not, see <http://www.gnu.org/licenses/>.
  
 IF(NOT WIN32)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 ENDIF(NOT WIN32)
 
 # a list of all files belonging to celeste library
