--- storage/innobase/xtrabackup/src/libarchive/CMakeLists.txt	2015-10-16 20:40:52.000000000 +0200
+++ storage/innobase/xtrabackup/src/libarchive/CMakeLists.txt.new	2015-11-03 14:46:57.952677630 +0100
@@ -822,9 +822,9 @@
 # Especially for early development, we want to be a little
 # aggressive about diagnosing build problems; this can get
 # relaxed somewhat in final shipping versions.
-IF ("CMAKE_C_COMPILER_ID" MATCHES "^GNU$")
+IF (CMAKE_C_COMPILER_ID MATCHES "^GNU$")
   ADD_DEFINITIONS(-Wall -Werror)
-ENDIF ("CMAKE_C_COMPILER_ID" MATCHES "^GNU$")
+ENDIF (CMAKE_C_COMPILER_ID MATCHES "^GNU$")
 
 IF(ENABLE_TEST)
 ADD_CUSTOM_TARGET(run_all_tests)