From 9b2bf1a6d17c2d39a4709afe3f3174e04a7e0fc3 Mon Sep 17 00:00:00 2001
From: Paul Zander <negril.nx+gentoo@gmail.com>
Date: Fri, 13 Mar 2026 11:48:08 +0100
Subject: [PATCH] boost-1.70

support boost::system header-only

Signed-off-by: Paul Zander <negril.nx+gentoo@gmail.com>

diff --git a/autoconf/ax_boost_system.m4 b/autoconf/ax_boost_system.m4
index 4d1c92b..c7cafd4 100644
--- a/autoconf/ax_boost_system.m4
+++ b/autoconf/ax_boost_system.m4
@@ -78,6 +78,9 @@ AC_DEFUN([AX_BOOST_SYSTEM],
         if test "x$ax_cv_boost_system" = "xyes"; then
             AC_SUBST(BOOST_CPPFLAGS)
 
+            if test "x$ax_boost_user_system_lib" = "xheader-only"; then
+                AC_DEFINE(HAVE_BOOST_SYSTEM,,[define if the Boost::System header is available])
+            else
             AC_DEFINE(HAVE_BOOST_SYSTEM,,[define if the Boost::System library is available])
             BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
 
@@ -112,6 +115,7 @@ AC_DEFUN([AX_BOOST_SYSTEM],
             if test "x$link_system" = "xno"; then
                 AC_MSG_ERROR(Could not link against $ax_lib !)
             fi
+            fi
         fi
 
         CPPFLAGS="$CPPFLAGS_SAVED"
-- 
2.53.0