BUG: Patch from bug#4312 to make uninstall work with DESTDIR.

cmake_uninstall.cmake.in

@@ -5,18 +5,18 @@ ENDIF(NOT EXISTS "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt")
 FILE(READ "@CMAKE_CURRENT_BINARY_DIR@/install_manifest.txt" files)
 STRING(REGEX REPLACE "\n" ";" files "${files}")
 FOREACH(file ${files})
-  MESSAGE(STATUS "Uninstalling \"${file}\"")
-  IF(EXISTS "${file}")
+  MESSAGE(STATUS "Uninstalling \"$ENV{DESTDIR}${file}\"")
+  IF(EXISTS "$ENV{DESTDIR}${file}")
     EXEC_PROGRAM(
-      "@CMAKE_COMMAND@" ARGS "-E remove \"${file}\""
+      "@CMAKE_COMMAND@" ARGS "-E remove \"$ENV{DESTDIR}${file}\""
       OUTPUT_VARIABLE rm_out
       RETURN_VALUE rm_retval
       )
     IF("${rm_retval}" STREQUAL 0)
     ELSE("${rm_retval}" STREQUAL 0)
-      MESSAGE(FATAL_ERROR "Problem when removing \"${file}\"")
+      MESSAGE(FATAL_ERROR "Problem when removing \"$ENV{DESTDIR}${file}\"")
     ENDIF("${rm_retval}" STREQUAL 0)
-  ELSE(EXISTS "${file}")
-    MESSAGE(STATUS "File \"${file}\" does not exist.")
-  ENDIF(EXISTS "${file}")
+  ELSE(EXISTS "$ENV{DESTDIR}${file}")
+    MESSAGE(STATUS "File \"$ENV{DESTDIR}${file}\" does not exist.")
+  ENDIF(EXISTS "$ENV{DESTDIR}${file}")
 ENDFOREACH(file)