From 74fdc1185f40c2fe2253043ff3f563fbbd4b43ed Mon Sep 17 00:00:00 2001
From: Michael Osipov <michael.osipov@innomotics.com>
Date: Wed, 17 Sep 2025 20:33:25 +0200
Subject: [PATCH] configure: add "-mt" for pthread support on HP-UX

HP-UX requires this compiler and linker flag to pass proper macros and
add required libraries.

Closes #18585
---
 configure.ac | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index af005beffd..3f02d037ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4340,11 +4340,9 @@ if test "$want_threaded_resolver" = "yes" && test "$USE_THREADS_WIN32" != "1"; t
       AC_CHECK_FUNC(pthread_create, [USE_THREADS_POSIX=1] )
       LIBS="$save_LIBS"
 
-      dnl on HP-UX, life is more complicated...
       case $host in
         *-hp-hpux*)
-          dnl it doesn't actually work without -lpthread
-          USE_THREADS_POSIX=""
+          CFLAGS="$CFLAGS -mt"
           ;;
         *)
           ;;
-- 
2.47.3