diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index b70e6566747..d0ba8ee9f1b 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -176,16 +176,6 @@ check_symbol_exists(posix_spawn spawn.h HAVE_POSIX_SPAWN)
 check_symbol_exists(pread unistd.h HAVE_PREAD)
 check_symbol_exists(realpath stdlib.h HAVE_REALPATH)
 check_symbol_exists(sbrk unistd.h HAVE_SBRK)
-check_symbol_exists(srand48 stdlib.h HAVE_RAND48_SRAND48)
-if( HAVE_RAND48_SRAND48 )
-  check_symbol_exists(lrand48 stdlib.h HAVE_RAND48_LRAND48)
-  if( HAVE_RAND48_LRAND48 )
-    check_symbol_exists(drand48 stdlib.h HAVE_RAND48_DRAND48)
-    if( HAVE_RAND48_DRAND48 )
-      set(HAVE_RAND48 1 CACHE INTERNAL "are srand48/lrand48/drand48 available?")
-    endif()
-  endif()
-endif()
 check_symbol_exists(strtoll stdlib.h HAVE_STRTOLL)
 check_symbol_exists(strtoq stdlib.h HAVE_STRTOQ)
 check_symbol_exists(strerror string.h HAVE_STRERROR)
diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 27486fff464..deecd0bc9da 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -212,9 +212,6 @@
 /* Have pthread_rwlock_init */
 #cmakedefine HAVE_PTHREAD_RWLOCK_INIT ${HAVE_PTHREAD_RWLOCK_INIT}
 
-/* Define to 1 if srand48/lrand48/drand48 exist in <stdlib.h> */
-#cmakedefine HAVE_RAND48 ${HAVE_RAND48}
-
 /* Define to 1 if you have the `realpath' function. */
 #cmakedefine HAVE_REALPATH ${HAVE_REALPATH}