From e77adcea6ebc7337e56bbc0da9bd410ecc550744 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <sezeroz@gmail.com>
Date: Sat, 29 Jun 2024 13:23:52 +0300
Subject: [PATCH] m4: '+=' is not universally supported

* m4/libtool.m4: Remove '+=' in variable assignment since it is not
  universally supported.
---
 m4/libtool.m4 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 381d4cb35..31f1be04b 100644
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -1030,7 +1030,7 @@ m4_defun_once([_LT_REQUIRED_DARWIN_CHECKS],[
     AC_CACHE_CHECK([for -no_fixup_chains linker flag],
       [lt_cv_support_no_fixup_chains],
       [ save_LDFLAGS=$LDFLAGS
-        LDFLAGS+=" -Wl,-no_fixup_chains"
+        LDFLAGS="$LDFLAGS -Wl,-no_fixup_chains"
         AC_LINK_IFELSE(
           [AC_LANG_PROGRAM([],[])],
           lt_cv_support_no_fixup_chains=yes,
@@ -1091,7 +1091,7 @@ _LT_EOF
         *)
           _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup'
           if test yes = "$lt_cv_support_no_fixup_chains"; then
-            _lt_dar_allow_undefined+=' $wl-no_fixup_chains'
+            _lt_dar_allow_undefined='$_lt_dar_allow_undefined $wl-no_fixup_chains'
           fi
         ;;
       esac
-- 
2.47.3