When installing, try 'python2' first, fall back on 'python'

Makefile

@@ -2,6 +2,7 @@ DESTDIR = /
 PREFIX = /usr/local
 MANDIR = $(PREFIX)/share/man
 UNITDIR = /lib/systemd/system
+PYTHON = $(or $(shell command -v python2),python)
 
 MANPAGELIST := $(patsubst %,docs/%,re6st-conf.1 re6st-registry.1 re6stnet.8)
 
@@ -17,8 +18,7 @@ install: install-noinit
 
 install-noinit: install-man
 	set -e $(DESTDIR)$(PREFIX) /bin/re6stnet; [ -x $$1$$2 ] || \
-	$(or $(PYTHON),python2) setup.py install \
-		--prefix=$(PREFIX) --root=$(DESTDIR); \
+	$(PYTHON) setup.py install --prefix=$(PREFIX) --root=$(DESTDIR); \
 	install -d $$1/sbin; mv $$1$$2 $$1/sbin
 	install -Dpm 0644 daemon/README.conf $(DESTDIR)/etc/re6stnet/README
 	install -Dpm 0644 daemon/logrotate.conf $(DESTDIR)/etc/logrotate.d/re6stnet

debian/common.mk

@@ -16,7 +16,7 @@ debian/changelog:
 endif
 
 override_dh_install:
-	make DESTDIR=$(TMP) PREFIX=/usr PYTHON=/usr/bin/python install
+	make DESTDIR=$(TMP) PREFIX=/usr install
 
 # BBB: compat < 10 ; https://bugs.debian.org/879727
 override_dh_systemd_start: