diff --git a/llvm/autoconf/configure.ac b/llvm/autoconf/configure.ac
index e8c00a476f25..a236005ac220 100644
--- a/llvm/autoconf/configure.ac
+++ b/llvm/autoconf/configure.ac
@@ -443,8 +443,8 @@ dnl===-----------------------------------------------------------------------===
 
 AC_CHECK_FUNCS([backtrace getcwd getpagesize getrusage gettimeofday isatty ])
 AC_CHECK_FUNCS([mkdtemp mkstemp mktemp ])
-AC_CHECK_FUNCS([realpath setrlimit strdup strerror strerror_r strtoll strtoq ])
-AC_CHECK_FUNCS([sysconf])
+AC_CHECK_FUNCS([realpath sbrk setrlimit strdup strerror strerror_r ])
+AC_CHECK_FUNCS([strtoll strtoq sysconf])
 AC_C_PRINTF_A
 AC_FUNC_ALLOCA
 AC_FUNC_RAND48
diff --git a/llvm/configure b/llvm/configure
index 69e95560cd4b..870f63397645 100755
--- a/llvm/configure
+++ b/llvm/configure
@@ -27274,8 +27274,7 @@ done
 
 
 
-
-for ac_func in realpath setrlimit strdup strerror strerror_r strtoll strtoq
+for ac_func in realpath sbrk setrlimit strdup strerror strerror_r
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5
@@ -27377,7 +27376,9 @@ fi
 done
 
 
-for ac_func in sysconf
+
+
+for ac_func in strtoll strtoq sysconf
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5