COMP: boost 1.35 is required for the special functions library

CMakeLists.txt

@@ -654,13 +654,18 @@ OPTION(OTB_USE_EXTERNAL_BOOST "Use an outside build of Boost." OFF)
 IF(OTB_USE_EXTERNAL_BOOST)
   FIND_PACKAGE(Boost)
   IF(Boost_FOUND)
+    MESSAGE(STATUS "Found Boost version ${Boost_VERSION}")
     IF( ${Boost_MINOR_VERSION} EQUAL 40)
       MESSAGE(WARNING "Boost 1.40 not supported. Disabling OTB_USE_EXTERNAL_BOOST")
       SET(OTB_USE_EXTERNAL_BOOST  OFF)
     ENDIF(${Boost_MINOR_VERSION} EQUAL 40)
+    IF( ${Boost_MINOR_VERSION} LESS 35)
+      MESSAGE(WARNING "Boost >= 1.35 is required. Disabling OTB_USE_EXTERNAL_BOOST")
+      SET(OTB_USE_EXTERNAL_BOOST  OFF)
+    ENDIF(${Boost_MINOR_VERSION} LESS 35)
   ELSE(Boost_FOUND)
     MESSAGE(FATAL_ERROR
-                  "Cannot build OTB project without boost library.  Please set Boost directories or set OTB_USE_EXTERNAL_BOOST to OFF to use INTERNAL Boost set on OTB/Utilities repository.")
+                  "Cannot build OTB project without boost library.  Please set Boost directories or set OTB_USE_EXTERNAL_BOOST to OFF to use the INTERNAL Boost version")
   ENDIF(Boost_FOUND)
 ENDIF(OTB_USE_EXTERNAL_BOOST)