diffutils 2.8.4 bug when make -j is used

[Chris Bainbridge]

Hi, theres a bug in src/Makefile.in/am. It does:

paths.h:   
        (echo '#define DEFAULT_DIFF_PROGRAM "$(bindir)/'`echo diff|sed   
'$(transform)'`'"' && \   
         echo '#define LOCALEDIR "$(localedir)"') >$@   
   
When make -j is used this gets run in a subshell and theres a race condition   
between  paths.h being created and used. Replacing it with curly brackets like 
this works:

paths.h:   
        { echo '#define DEFAULT_DIFF_PROGRAM "$(bindir)/'`echo diff|sed   
'$(transform)'`'"' && \   
         echo '#define LOCALEDIR "$(localedir)"'; } >$@   
   
Bug report originally from gentoo linux (see 
http://bugs.gentoo.org/show_bug.cgi?id=8934 ).