git: improved to build/install man pages if 'xmlto' package is installed

develop/git/git.conf

@@ -27,6 +27,12 @@ var_append makeinstopt ' ' 'install-gitweb'
 if pkginstalled asciidoc; then
 	var_append makeopt ' ' 'html'
 	var_append makeinstopt ' ' 'install-html'
+	# build/install man pages
+	if pkginstalled xmlto; then
+		var_append makeopt ' ' 'man'
+		var_append makeinstopt ' ' 'install-man'
+	fi
+
 fi
 
 git_contrib_install() {