diff --git a/cmake/FindGRASS.cmake b/cmake/FindGRASS.cmake
index 4f2e1fced60..36479ac8ea2 100644
--- a/cmake/FindGRASS.cmake
+++ b/cmake/FindGRASS.cmake
@@ -84,6 +84,26 @@ MACRO (CHECK_GRASS G_PREFIX)
           #MESSAGE(STATUS "GRASS_OFF_T_SIZE${GRASS_FIND_VERSION} = ${GRASS_OFF_T_SIZE${GRASS_FIND_VERSION}}")
         ENDIF( (GRASS_MAJOR_VERSION${GRASS_FIND_VERSION} EQUAL 7) AND (GRASS_MINOR_VERSION${GRASS_FIND_VERSION} GREATER 0) )
 
+        IF ( "${GRASS_OFF_T_SIZE${GRASS_FIND_VERSION}}" STREQUAL "" )
+          IF(EXISTS ${GRASS_INCLUDE_DIR${GRASS_CACHE_VERSION}}/Make/Platform.make)
+            FILE(READ ${GRASS_INCLUDE_DIR${GRASS_CACHE_VERSION}}/Make/Platform.make PLATFORMFILE)
+            STRING(REGEX MATCH "LFS_CFLAGS *=[^\n]*" PLATFORM_LFS_CFLAGS ${PLATFORMFILE})
+            IF ( NOT "${PLATFORM_LFS_CFLAGS}" STREQUAL "" )
+              STRING(REGEX MATCH "_FILE_OFFSET_BITS=.." FILE_OFFSET_BITS ${PLATFORM_LFS_CFLAGS})
+              #MESSAGE(STATUS "FILE_OFFSET_BITS = ${FILE_OFFSET_BITS}")
+              IF ( NOT "${FILE_OFFSET_BITS}" STREQUAL "" )
+                STRING(REGEX MATCH "[0-9][0-9]" FILE_OFFSET_BITS ${FILE_OFFSET_BITS})
+                #MESSAGE(STATUS "FILE_OFFSET_BITS = ${FILE_OFFSET_BITS}")
+                IF ( "${FILE_OFFSET_BITS}" STREQUAL "32" )
+                  SET( GRASS_OFF_T_SIZE${GRASS_FIND_VERSION} 4 )
+                ELSEIF( "${FILE_OFFSET_BITS}" STREQUAL "64" )
+                  SET( GRASS_OFF_T_SIZE${GRASS_FIND_VERSION} 8 )
+                ENDIF()        
+              ENDIF()        
+            ENDIF()        
+          ENDIF()
+        ENDIF()
+
         IF(GRASS_LIBRARIES_FOUND${GRASS_FIND_VERSION})
           SET(GRASS_FOUND${GRASS_FIND_VERSION} TRUE)
           SET(GRASS_FOUND TRUE) # GRASS_FOUND is true if at least one version was found