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-rw-r--r--ares/configure.ac4
1 files changed, 3 insertions, 1 deletions
diff --git a/ares/configure.ac b/ares/configure.ac
index d90d70b0c..12b61514f 100644
--- a/ares/configure.ac
+++ b/ares/configure.ac
@@ -162,7 +162,9 @@ esac
AC_MSG_CHECKING([whether we are using the IBM C compiler])
CURL_CHECK_DEF([__IBMC__], [], [silent])
-if test "$curl_cv_have_def___IBMC__" = "yes"; then
+CURL_CHECK_DEF([__IBMCPP__], [], [silent])
+if test "$curl_cv_have_def___IBMC__" = "yes" ||
+ test "$curl_cv_have_def___IBMCPP__" = "yes"; then
AC_MSG_RESULT([yes])
dnl Ensure that compiler optimizations are always thread-safe.
CFLAGS="$CFLAGS -qthreaded"