many *.m4 files: improve m4 quoting

[gnulib.git] / m4 / pipe.m4

diff --git a/m4/pipe.m4 b/m4/pipe.m4
index 12da48f..83f2868 100644 (file)
--- a/m4/pipe.m4
+++ b/m4/pipe.m4
@@ -1,5 +1,5 @@
-# pipe.m4 serial 2
-dnl Copyright (C) 2004, 2008 Free Software Foundation, Inc.
+# pipe.m4 serial 3
+dnl Copyright (C) 2004, 2008, 2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -7,7 +7,7 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_PIPE],
 [
   dnl Prerequisites of lib/pipe.h.
-  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_CHECK_HEADERS_ONCE([unistd.h])
   dnl Prerequisites of lib/pipe.c.
   AC_REQUIRE([AC_C_INLINE])
   AC_REQUIRE([AC_TYPE_MODE_T])
@@ -16,7 +16,7 @@ AC_DEFUN([gl_PIPE],
     [gl_POSIX_SPAWN_WORKS
      case "$gl_cv_func_posix_spawn_works" in
        *yes)
-         AC_DEFINE([HAVE_POSIX_SPAWN], 1,
+         AC_DEFINE([HAVE_POSIX_SPAWN], [1],
            [Define if you have the posix_spawn() function and it works.])
          ;;
      esac