[PATCH 1/3] Add missing space before operator

[Guido Günther <agx sigxcpu org>]

so we don't end up with:

    checking for QT... no
    ./configure: line 20754: !echo: command not found
    checking for LIBNL3... no
---
 configure.ac |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 0285b2b..fc43ed4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -277,7 +277,7 @@ AS_IF([test -z "$with_session_tracking"], with_session_tracking=consolekit)
 AS_IF([test "$with_session_tracking" = "ck"], with_session_tracking=consolekit)
 AS_IF([test "$with_session_tracking" = "none"], with_session_tracking=no)
 # check value
-AS_IF([!echo "$with_session_tracking" | grep -E "^(systemd|consolekit|no)$"],
+AS_IF([! echo "$with_session_tracking" | grep -E "^(systemd|consolekit|no)$"],
 	AC_MSG_ERROR([--with-session-tracking must be systemd/consolekit/no, not $with_session_tracking]))
 # add conditionals and subtitutions
 AM_CONDITIONAL(SESSION_TRACKING_CK, test "$with_session_tracking" = "consolekit")
-- 
1.7.10.4