--- Makefile.orig	2021-02-06 10:47:39 UTC
+++ Makefile
@@ -20,7 +20,6 @@ RM  ?= rm
 all: develop
 
 mathics_scanner/data/characters.json: mathics_scanner/data/named-characters.yml
-	$(PIP) install -r requirements-dev.txt
 	$(PYTHON) mathics_scanner/generate/build_tables.py
 
 #: build everything needed to install