git-gui: Allow gitexecdir, INSTALL to be set by the caller.

When used as a subproject within git.git our Makefile must honor
the gitexecdir which git.git's Makefile is passing down to us,
ensuring that we install our executables into the libexec chosen
by the end-user or packager.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/Makefile b/Makefile
index 8fade69127611ba9a6e38bed65b861379ac7dcce..f1668bbd18b26d11e8272f49ef20d90c8b8f7f93 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -12,12 +12,16 @@ ifndef SHELL_PATH
        SHELL_PATH = /bin/sh
 endif
 
-gitexecdir := $(shell git --exec-path)
-INSTALL = install
+ifndef gitexecdir
+       gitexecdir := $(shell git --exec-path)
+endif
+
+ifndef INSTALL
+       INSTALL = install
+endif
 
 DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
 gitexecdir_SQ = $(subst ','\'',$(gitexecdir))
-
 SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
 
 $(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh