docs: add --with-support-url= to distribution porting guide. (#4035)

diff --git a/DISTRO_PORTING b/DISTRO_PORTING
index 07aea865be8367519c99f7b749fa788abd22be0e..a397d700c613ca189d677acff3018f789e68dde4 100644 (file)
--- a/DISTRO_PORTING
+++ b/DISTRO_PORTING
@@ -15,6 +15,7 @@ HOWTO:
             --with-kbd-setfont=
             --with-tty-gid=
             --with-ntp-servers=
+            --with-support-url=
 
         2) Try it out. Play around (as an ordinary user) with
         '/usr/lib/systemd/systemd --test --system' for a test run