From 35e93ec73825b29e4cb84b7f603c7abd1edbb005 Mon Sep 17 00:00:00 2001
From: Andre Maroneze <andre.maroneze@cea.fr>
Date: Tue, 1 Jun 2021 14:53:05 +0200
Subject: [PATCH] [configure] avoid '+=' errors during configure in Alpine

---
 configure.in | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/configure.in b/configure.in
index e7c2cf5fd75..450866b81f1 100644
--- a/configure.in
+++ b/configure.in
@@ -652,7 +652,7 @@ CPPFLAGS="$OLD_CPPFLAGS -m32"
 AC_PREPROC_IFELSE(
   [AC_LANG_SOURCE([/* Check if preprocessor supports option -m32 */])],
   [if test -e conftest.i; then
-    DEFAULT_CPP_SUPPORTED_ARCH_OPTS+='\"-m32\"; ';
+    DEFAULT_CPP_SUPPORTED_ARCH_OPTS="$DEFAULT_CPP_SUPPORTED_ARCH_OPTS "'\"-m32\";';
   fi], [])
 
 rm -f conftest.i
@@ -660,7 +660,7 @@ CPPFLAGS="$OLD_CPPFLAGS -m64"
 AC_PREPROC_IFELSE(
   [AC_LANG_SOURCE([/* Check if preprocessor supports option -m64 */])],
   [if test -e conftest.i; then
-    DEFAULT_CPP_SUPPORTED_ARCH_OPTS+='\"-m64\"; ';
+    DEFAULT_CPP_SUPPORTED_ARCH_OPTS="$DEFAULT_CPP_SUPPORTED_ARCH_OPTS "'\"-m64\";';
   fi], [])
 
 rm -f conftest.i
@@ -668,13 +668,13 @@ CPPFLAGS="$OLD_CPPFLAGS -m16"
 AC_PREPROC_IFELSE(
   [AC_LANG_SOURCE([/* Check if preprocessor supports option -m16 */])],
   [if test -e conftest.i; then
-    DEFAULT_CPP_SUPPORTED_ARCH_OPTS+='\"-m16\"; ';
+    DEFAULT_CPP_SUPPORTED_ARCH_OPTS="$DEFAULT_CPP_SUPPORTED_ARCH_OPTS "'\"-m16\";';
   fi], [])
 
 # revert CPPFLAGS to original value
 CPPFLAGS=$OLD_CPPFLAGS
 
-AC_MSG_RESULT(Default preprocessor supported architecture-related options: $DEFAULT_CPP_SUPPORTED_ARCH_OPTS)
+AC_MSG_RESULT(Default preprocessor supported architecture-related options:$DEFAULT_CPP_SUPPORTED_ARCH_OPTS)
 
 
 #################
-- 
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