From dbbb80cb48b67db8aff7d53179d9e7dc716a53b9 Mon Sep 17 00:00:00 2001
From: Peter Kokot <peterkokot@gmail.com>
Date: Thu, 15 Jun 2017 02:30:39 +0200
Subject: [PATCH] Fix configure error

This patch fixes configure error on some systems such as Alpine.

```
 line 3472: test: =: unary operator expected
```

One of the fixes has been suggested also here already:
https://bugs.php.net/bug.php?id=39835

Thank you for considering merging this.
---
 acinclude.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/acinclude.m4 b/acinclude.m4
index 36bd1c22e5817..f5e0efa72944b 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2687,7 +2687,7 @@ EOF
   done
 
   echo "'[$]0' \\" >> $1
-  if test `expr -- [$]0 : "'.*"` = 0; then
+  if test `expr " [$]0" : " '.*"` = 0; then
     CONFIGURE_COMMAND="$CONFIGURE_COMMAND '[$]0'"
   else 
     CONFIGURE_COMMAND="$CONFIGURE_COMMAND [$]0"