unbreak quoting; fixes #5401

diff --git a/m4/pdns_check_os.m4 b/m4/pdns_check_os.m4
index 315fef4f32c47f8f97a883a21fab04635980ea70..2afdbb6bd4c5badc77edeca04aa52844008ba3fd 100644 (file)
--- a/m4/pdns_check_os.m4
+++ b/m4/pdns_check_os.m4
@@ -39,7 +39,7 @@ AC_DEFUN([PDNS_CHECK_OS],[
   mips* | powerpc* )
     AX_CHECK_LINK_FLAG([-latomic],
       [ : ],
-      AC_MSG_ERROR([Unable to link against libatomic, cannot continue])
+      [ AC_MSG_ERROR([Unable to link against libatomic, cannot continue]) ]
     )
     LDFLAGS="-latomic $LDFLAGS"
     ;;