v3, 4 partsgitk-git/Makefile: track TCLTK_PATH as it used to be tracked

> In 62ba514 (Move gitk to its own subdirectory, 2007-11-17) some
> code used to track TCLTK_PATH was left in the main Makefile instead
> of being moved to the new Makefile that was created in gitk-git/.
>
> The code left in the main Makefile should have been removed by a
> previous patch in the same series as this one.
>
> And this patch puts some code back to track TCLTK_PATH properly
> where it should be, that is in gitk-git/Makefile.
>
> Note that there is already some code to do that in git-gui/Makefile.
>
> Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
> ---
>  .gitignore          |  1 -
>  gitk-git/.gitignore |  2 ++
>  gitk-git/Makefile   | 16 ++++++++++++++--

>  3 files changed, 16 insertions(+), 3 deletions(-)
>  create mode 100644 gitk-git/.gitignore
>
> diff --git a/.gitignore b/.gitignore
> index 086c5af..56a4b2b 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -171,7 +171,6 @@
>  /git-whatchanged
>  /git-write-tree
>  /git-core-*/?*
> -/gitk-git/gitk-wish
>  /gitweb/GITWEB-BUILD-OPTIONS
>  /gitweb/gitweb.cgi
>  /gitweb/static/gitweb.js
> diff --git a/gitk-git/.gitignore b/gitk-git/.gitignore
> new file mode 100644
> index 0000000..d7ebcaf
> --- /dev/null
> +++ b/gitk-git/.gitignore
> @@ -0,0 +1,2 @@
> +/GIT-TCLTK-VARS
> +/gitk-wish
> diff --git a/gitk-git/Makefile b/gitk-git/Makefile
> index e1b6045..5acdc90 100644
> --- a/gitk-git/Makefile
> +++ b/gitk-git/Makefile
> @@ -17,6 +17,16 @@ DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
>  bindir_SQ = $(subst ','\'',$(bindir))
>  TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
>  
> +### Detect Tck/Tk interpreter path changes
> +TRACK_TCLTK = $(subst ','\'',-DTCLTK_PATH='$(TCLTK_PATH_SQ)')
> +
> +GIT-TCLTK-VARS: FORCE
> +	@VARS='$(TRACK_TCLTK)'; \
> +		if test x"$$VARS" != x"`cat $@ 2>/dev/null`" ; then \
> +			echo 1>&2 "    * new Tcl/Tk interpreter location"; \
> +			echo "$$VARS" >$@; \
> +		fi
> +
>  ## po-file creation rules
>  XGETTEXT   ?= xgettext
>  ifdef NO_MSGFMT
> @@ -49,9 +59,9 @@ uninstall::
>  	$(RM) '$(DESTDIR_SQ)$(bindir_SQ)'/gitk
>  
>  clean::
> -	$(RM) gitk-wish po/*.msg
> +	$(RM) gitk-wish po/*.msg GIT-TCLTK-VARS
>  
> -gitk-wish: gitk
> +gitk-wish: gitk GIT-TCLTK-VARS
>  	$(QUIET_GEN)$(RM) $@ $@+ && \
>  	sed -e '1,3s|^exec .* "$$0"|exec $(subst |,'\|',$(TCLTK_PATH_SQ)) "$$0"|' <gitk >$@+ && \
>  	chmod +x $@+ && \
> @@ -65,3 +75,5 @@ $(ALL_MSGFILES): %.msg : %.po
>  	@echo Generating catalog $@
>  	$(MSGFMT) --statistics --tcl $< -l $(basename $(notdir $<)) -d $(dir $@)
>  
> +.PHONY: all install uninstall clean update-po
> +.PHONY: FORCE

>
>>  .gitignore          |  1 -
>>  gitk-git/.gitignore |  2 ++
>>  gitk-git/Makefile   | 16 ++++++++++++++--
> 
> I'll apply the .gitignore part to my tree, but could you split the
> rest out and have Paul apply to his tree at
> 
>     git://ozlabs.org/~paulus/gitk.git