This patch does two things: (1) use the right name for `docbook2texi',
and (2) make sure `gitman.info' isn't produced since it's broken (duplicate
node names).

diff -ru git-1.8.4-orig/Documentation/Makefile git-1.8.4/Documentation/Makefile
--- git-1.8.4-orig/Documentation/Makefile	2013-08-23 21:38:43.000000000 +0200
+++ git-1.8.4/Documentation/Makefile	2013-09-30 14:48:51.532890378 +0200
@@ -101,7 +101,7 @@
 
 MAKEINFO = makeinfo
 INSTALL_INFO = install-info
-DOCBOOK2X_TEXI = docbook2x-texi
+DOCBOOK2X_TEXI = docbook2texi
 DBLATEX = dblatex
 ifndef PERL_PATH
 	PERL_PATH = /usr/bin/perl
@@ -205,7 +205,7 @@
 man5: $(DOC_MAN5)
 man7: $(DOC_MAN7)
 
-info: git.info gitman.info
+info: git.info
 
 pdf: user-manual.pdf
 
@@ -221,10 +221,9 @@
 
 install-info: info
 	$(INSTALL) -d -m 755 $(DESTDIR)$(infodir)
-	$(INSTALL) -m 644 git.info gitman.info $(DESTDIR)$(infodir)
+	$(INSTALL) -m 644 git.info $(DESTDIR)$(infodir)
 	if test -r $(DESTDIR)$(infodir)/dir; then \
 	  $(INSTALL_INFO) --info-dir=$(DESTDIR)$(infodir) git.info ;\
-	  $(INSTALL_INFO) --info-dir=$(DESTDIR)$(infodir) gitman.info ;\
 	else \
 	  echo "No directory found in $(DESTDIR)$(infodir)" >&2 ; \
 	fi