diff --git a/.gitignore b/.gitignore
index a61902a0..ee766b37 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 # virtual env
+/env/
+
 /bin/
 /include/
 /lib/
diff --git a/Makefile b/Makefile
index 51bbdfad..94b59485 100644
--- a/Makefile
+++ b/Makefile
@@ -1,68 +1,65 @@
-.PHONY: clean_env init_env clean_virtualenv install_packages clean install run all schema_seminar.pdf schema_all.pdf sync_test_media sync_test_db sync_test sync_local_media sync_local_db sync_local
-PYTHON=python2.7
-VE_VER=16.0.0
-LOCAL_PYTHON=bin/python
+PYTHON := python3
+VENV := python3 -m venv
+# Všechny flagy, které se s venvem/virtualenvem/... mají volat patří sem. Volá se "${VENV} cesta"
+VENV_PATH := env
+# Musí být definovaná, i kdyby to měla být "."
 
-all: install
-
-clean: clean_env
-
-veryclean: clean clean_virtualenv
-
-install: virtualenv bin/python install_packages
-
-
-# phony, but depends on file
-make_env: ${LOCAL_PYTHON}
+.PHONY: all venv_check clean install install_web install_venv clean_venv clean_schema run test deploy_test deploy_prod sync_test_media sync_test_db sync_test sync_local_media sync_local_db sync_local
 
-# phony, but fast repeated execution
-install_packages: make_env
-	bin/pip install -r requirements.txt --upgrade
+# activate by mělo být předpokladem ke všemu, co volá webový python (i.e. python nasazený do ${VENV}u kvůli webu, např. manage.py)
+all: install
 
-# phony
-clean_env:
-	rm -rf bin/ include/ lib/ local/ share/
+venv_check:
+	@# Pokud org nemá zapnutý venv, poradíme mu, aby si ho zapnul a spadneme. Jinak nic.
+	@expr $$PATH : ".*:*$(shell pwd)/${VENV_PATH}/bin" > /dev/null && exit 0 || echo "Není zapnutý env, spusť \". ${VENV_PATH}/bin/activate\"." && false
+
+clean: clean_venv clean_schema
+
+install:
+	@# Just echo:
+	# Install je trochu magický:
+	# Spusť následující posloupnost příkazů:
+	#	make install_venv
+	#	. ${VENV_PATH}/bin/activate
+	#	make install_web
+
+install_web: venv_check
+	@# venv může být příšerně starý, takže nejdříve upgradujeme venvové věci
+	echo $$PATH
+	pip install --upgrade pip
+	pip install --upgrade setuptools
+	# Instalace závislostí webu
+	pip install -r requirements.txt --upgrade
+
+install_venv:
+	${VENV} ${VENV_PATH}
+
+clean_venv:
+	# Možná není 100% foolproof...
+	@test ! ${VENV_PATH} = . || ! echo "Smaž si prosím venv sám, nebudu mazat celý web"
+	rm -rfv ${VENV_PATH}
 	rm -f pip-selfcheck.json
+clean_schema:
 	rm -f schema_seminar.pdf schema_all.pdf
 
-# binary name representing set-up env
-${LOCAL_PYTHON}: virtualenv
-	${PYTHON} virtualenv/virtualenv.py .
-
-
-
-# directory name
-virtualenv:
-	# I could not find a link without hash anymore. This will probably break in
-	# the future.
-	curl -O https://files.pythonhosted.org/packages/33/bc/fa0b5347139cd9564f0d44ebd2b147ac97c36b2403943dbee8a25fd74012/virtualenv-16.0.0.tar.gz
-	tar xvfz virtualenv-${VE_VER}.tar.gz
-	mv -T virtualenv-${VE_VER} virtualenv
-	rm virtualenv-${VE_VER}.tar.gz
-
-# phony
-clean_virtualenv:
-	rm -rf virtualenv/
-	rm -rf virtualenv-*.tar.gz
-
-run:
+run: venv_check
 	./manage.py runserver
 
-test:
+test: venv_check
 	./manage.py test -v2 seminar mamweb
 
 # DB schemata
 
 schema: schema_seminar.pdf schema_all.pdf
 
-schema_seminar.pdf:
+schema_seminar.pdf: venv_check
 	./manage.py graph_models seminar | dot -Tpdf > schema_seminar.pdf
 
-schema_all.pdf:
+schema_all.pdf: venv_check
 	./manage.py graph_models -a -g | dot -Tpdf > schema_all.pdf
 
 # Deploy to current *mamweb-test* directory
-deploy_test:
+deploy_test: venv_check
 	@if [ ${USER} != "mam-web" ]; then echo "Only possible by user mam-web"; exit 1; fi
 	@if [ `pwd` != "/akce/mam/www/mamweb-test" ]; then echo "Only possible in /akce/mam/www/mamweb-test"; exit 1; fi
 	@echo "Installing version from origin/test ..."
@@ -78,7 +75,7 @@ deploy_test:
 	@echo Done.
 
 # Deploy to current *mamweb-prod* directory
-deploy_prod:
+deploy_prod: venv_check
 	@if [ ${USER} != "mam-web" ]; then echo "Only possible by user mam-web"; exit 1; fi
 	@if [ `pwd` != "/akce/mam/www/mamweb-prod" ]; then echo "Only possible in /akce/mam/www/mamweb-prod"; exit 1; fi
 	@echo "Backing up production DB ..."
@@ -128,4 +125,4 @@ sync_local_db:
 	pg_restore -c -d mam-prod  last.pgdump
 
 # Sync database and media. See above lines
-sync_local: sync_media sync_db
+sync_local: sync_local_media sync_local_db
diff --git a/manage.py b/manage.py
index ccdb032b..24eeef69 100755
--- a/manage.py
+++ b/manage.py
@@ -1,4 +1,4 @@
-#!bin/python
+#!/usr/bin/env python
 import os
 import sys