Attempt to fix OpenIndiana build issue introduced by #19922
diff --git a/configure b/configure
index 6bcc4b5..101dd44 100755
--- a/configure
+++ b/configure
@@ -3447,12 +3447,18 @@
# On HP-UX mbstate_t requires _INCLUDE__STDC_A1_SOURCE
case $ac_sys_system in
-hp*|HP*)
+ hp*|HP*)
+ define_stdc_a1=yes;;
+ *)
+ define_stdc_a1=no;;
+esac
+
+if test $define_stdc_a1 = yes
+then
$as_echo "#define _INCLUDE__STDC_A1_SOURCE 1" >>confdefs.h
- ;;
-esac
+fi
#
# SGI compilers allow the specification of the both the ABI and the