diff --git a/data/Makefile b/data/Makefile
index f5d1dd9..60c09e3 100644
--- a/data/Makefile
+++ b/data/Makefile
@@ -10,6 +10,7 @@ PERL=perl
 MAKE=make
 JULIA=julia
 CURLFLAGS = --retry 5 --location
+UDATA=${EPREFIX}/usr/share/unicode-data
 
 .PHONY: clean
 
@@ -25,6 +26,7 @@ CharWidths.txt: charwidths.jl EastAsianWidth.txt
 UNICODE_VERSION=12.0.0
 
 UnicodeData.txt:
+	cp $(UDATA)/$@ $@
 	$(CURL) $(CURLFLAGS) -o $@ -O http://www.unicode.org/Public/$(UNICODE_VERSION)/ucd/UnicodeData.txt
 
 EastAsianWidth.txt:
@@ -43,10 +45,10 @@ CaseFolding.txt:
 	$(CURL) $(CURLFLAGS) -o $@ -O $(URLCACHE)http://www.unicode.org/Public/$(UNICODE_VERSION)/ucd/CaseFolding.txt
 
 NormalizationTest.txt:
-	$(CURL) $(CURLFLAGS) -o $@ -O $(URLCACHE)http://www.unicode.org/Public/$(UNICODE_VERSION)/ucd/NormalizationTest.txt
+	cp $(UDATA)/$@ $@
 
 GraphemeBreakTest.txt:
-	$(CURL) $(CURLFLAGS) $(URLCACHE)http://www.unicode.org/Public/$(UNICODE_VERSION)/ucd/auxiliary/GraphemeBreakTest.txt | $(PERL) -pe 's,÷,/,g;s,×,+,g' > $@
+	cat $(UDATA)/auxiliary/$@ | $(PERL) -pe 's,÷,/,g;s,×,+,g' > $@
 
 emoji-data.txt:
 	$(CURL) $(CURLFLAGS) -o $@ -O $(URLCACHE)http://unicode.org/Public/emoji/`echo $(UNICODE_VERSION) | cut -d. -f1-2`/emoji-data.txt