The xxd utility is packaged in dev-util/xxd. With USE=nls, the prerequisite
$(INSTALL_TOOL_LANGS) target variable contains install-tool-languages, which
only installs xxd manpages. Remove it to prevent file collisions with
dev-util/xxd.

From: Lucio Sauer <watermanpaint@posteo.net>
--- a/src/Makefile
+++ b/src/Makefile
@@ -947,7 +947,7 @@ EVIEWNAME	= e$(VIEWNAME)
 EVIEWTARGET	= $(EVIEWNAME)$(LNKEXT)
 
 ### Names of the tools that are also made  {{{1
-TOOLS = xxd/xxd$(EXEEXT)
+TOOLS =
 
 ### Installation directories.  The defaults come from configure. {{{1
 #
@@ -2533,16 +2533,11 @@ installspell: $(DEST_VIM) $(DEST_RT) $(DEST_SPELL)
 
 # install helper program xxd
 installtools: $(TOOLS) $(DESTDIR)$(exec_prefix) $(DEST_BIN) \
-		$(TOOLSSOURCE) $(DEST_VIM) $(DEST_RT) $(DEST_TOOLS) \
-		$(INSTALL_TOOL_LANGS)
+		$(TOOLSSOURCE) $(DEST_VIM) $(DEST_RT) $(DEST_TOOLS)
 	if test -f $(DEST_BIN)/xxd$(EXEEXT); then \
 	  mv -f $(DEST_BIN)/xxd$(EXEEXT) $(DEST_BIN)/xxd.rm; \
 	  rm -f $(DEST_BIN)/xxd.rm; \
 	fi
-	$(INSTALL_PROG) xxd/xxd$(EXEEXT) $(DEST_BIN)
-	$(STRIP) $(DEST_BIN)/xxd$(EXEEXT)
-	chmod $(BINMOD) $(DEST_BIN)/xxd$(EXEEXT)
-	-$(SHELL) ./installman.sh xxd $(DEST_MAN) "" $(INSTALLMANARGS)
 
 # install the runtime tools
 	$(INSTALL_DATA_R) $(TOOLSSOURCE)/* $(DEST_TOOLS)