Allow wish interpreter to be defined with TCLTK_PATH

Makefile got one external option:
- TCLTK_PATH: the path to the Tcl/Tk interpreter.

Users (or build wrappers) may set this variable to the
location of the wish executable.

Signed-off-by: Eygene Ryabinkin <rea-git@codelabs.ru>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/Makefile b/Makefile
index b82789ead6255b33be0f1ed2029a91611cea3072..2316b24e002f73b2f70a93a13c081216e4ef21fe 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -28,6 +28,8 @@ ifndef V
        QUIET_BUILT_IN = @echo '   ' BUILTIN $@;
 endif
 
+TCLTK_PATH ?= wish
+
 ifeq ($(findstring $(MAKEFLAGS),s),s)
 QUIET_GEN =
 QUIET_BUILT_IN =
@@ -55,6 +57,7 @@ all:: $(ALL_PROGRAMS)
 
 install: all
        $(INSTALL) -d -m755 '$(DESTDIR_SQ)$(gitexecdir_SQ)'
+       sed -i .bak -e'1,3s|^exec .* "$$0"|exec '"$(TCLTK_PATH)"' "$$0"|' git-gui && rm git-gui.bak
        $(INSTALL) git-gui '$(DESTDIR_SQ)$(gitexecdir_SQ)'
        $(foreach p,$(GITGUI_BUILT_INS), rm -f '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' && ln '$(DESTDIR_SQ)$(gitexecdir_SQ)/git-gui' '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' ;)