Bootstrap bug with wrapped lines?

[Andreas Grünbacher]

I'm running into a problem with the acl-permissions module, which
contains the following
Makefile snippet:

  lib_SOURCES += acl-errno-valid.c acl-internal.c \
    get-permissions.c set-permissions.c

This ends up as follows in Makefile.in in coreutils (line
wrapping changed for brevity):

  am__lib_libcoreutils_a_SOURCES_DIST = [...] \
    lib/acl-errno-valid.c lib/acl-internal.c \
    get-permissions.c set-permissions.c \
    [...]

In other words, only the lib_SOURCES files on the first line are
correctly prefixed with lib/.
The following change makes the problem go away:

diff --git a/modules/acl-permissions b/modules/acl-permissions
index 49b91ff..5c82c4b 100644
--- a/modules/acl-permissions
+++ b/modules/acl-permissions
@@ -21,8 +21,7 @@ configure.ac:
 gl_FUNC_ACL

 Makefile.am:
-lib_SOURCES += acl-errno-valid.c acl-internal.c \
-  get-permissions.c set-permissions.c
+lib_SOURCES += acl-errno-valid.c acl-internal.c get-permissions.c
set-permissions.c

 Include:
 "acl.h"

In addition to acl-permissions, the argp and inttostr modules are
using multiline lib_SOURCES directives.

How should this be fixed?

Thanks,
Andreas