With dash as /bin/sh, I see:
```
checking for sys/capability.h... yes
./configure: 95775: test: no: unexpected operator
checking for working fork... yes
```

* configure.ac: Use '=' in test for equality, not '==', for POSIX shell
  compatibility.

Fixes: 59d9f05ef766734662e97bab7e27c397d1132408
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ae00396ec..2da648987 100644
--- a/configure.ac
+++ b/configure.ac
@@ -134,7 +134,7 @@ if test "$gl_single_binary" = 'symlinks' ||
   fi
 fi
 AM_CONDITIONAL([SINGLE_BINARY], [test "$gl_single_binary" != no])
-AM_CONDITIONAL([SINGLE_BINARY_HARD], [test "$gl_single_binary" == hardlinks])
+AM_CONDITIONAL([SINGLE_BINARY_HARD], [test "$gl_single_binary" = hardlinks])
 
 AC_ARG_ENABLE([bold-man-page-references],
   [AS_HELP_STRING([--disable-bold-man-page-references],
-- 
2.53.0


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