I've tried to apply this patch to gnulib's git repository:
diff --git a/doc/posix-functions/posix_spawn_file_actions_addclose.texi
b/doc/posix-functions/posix_spawn_file_actions_addclose.texi
index 772093a..a0e583b 100644
--- a/doc/posix-functions/posix_spawn_file_actions_addclose.texi
+++ b/doc/posix-functions/posix_spawn_file_actions_addclose.texi
@@ -2,7 +2,9 @@
@section @code{posix_spawn_file_actions_addclose}
@findex posix_spawn_file_actions_addclose
+@raggedright
POSIX specification:@*
@url{http://www.opengroup.org/onlinepubs/9699919799/functions/posix_spawn_file_actions_addclose.html}
+@end raggedright
Gnulib module: posix_spawn_file_actions_addclose
and `make gnulib.pdf' produced a result as shown in the attached
image...
Werner
<<inline: raggedright.png>>
