bug#21815: Grep 2.22 build/run/check: "duplicated target '.deps/alloca.Po'"

[sur-behoffski]

G'day,

Thanks very much for the 2.22 release.  I've successfully built it
under Gentoo: 
* gcc: Gentoo 4.9.3 p1.2, pie-0.6.3
* glibc: (Gentoo) "2.21-r1"
* libpcre: (Gentoo stable) 8.36  [8.37-r2 is available as unstable]

and the configure/make/make check worked fine.  I haven't done any
performance testing.

A minor surprising error message happened during make, which is
usually squeaky-clean in its output.  I doubt that this is an error;
it may be related to the recent queries regarding translation:

$ make

make  all-recursive
make[1]: Entering directory '/home/grep-2.22/grep-2.22'
Making all in po
make[2]: Entering directory '/home/grep-2.22/grep-2.22/po'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/home/grep-2.22/grep-2.22/po'
Making all in lib
make[2]: Entering directory '/home/grep-2.22/grep-2.22/lib'
Makefile:1684: target '.deps/alloca.Po' given more than once in the
same rule
  GEN      alloca.h
  GEN      configmake.h
  GEN      c++defs.h

[...]

  GEN      wchar.h
  GEN      wctype.h
make  all-am
make[3]: Entering directory '/home/grep-2.22/grep-2.22/lib'
Makefile:1684: target '.deps/alloca.Po' given more than once in the
same rule
  CC       argmatch.o
  CC       binary-io.o

[...]

Looking at the sources, Line 308 of lib/Makefile.in may provide a
hint:

     lib/Makefile.in:308:am__depfiles_remade = $(DEPDIR)/alloca.Po
./$(DEPDIR)/alloca.Po 

cheers,

sur-behoffski (Brenton Hoff)
Programmer, Grouse Software