build system: Fix yet another issue with the detection of libupsclient.

diff --git a/configure.in b/configure.in
index 6829954..38373ac 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1259,7 +1259,7 @@ AC_ARG_WITH(libupsclient, [AS_HELP_STRING([--with-libupsclient@<:@=PREFIX@:>@],
                with_libupsclient="no"
        else
                with_libupsclient="yes"
-               if "x$withval" != "xyes"
+               if test "x$withval" != "xyes"
                then
                        if test -x "$withval"
                        then