--- Makefile	2018-07-02 10:32:59.653346000 +0200
+++ Makefile	2018-07-02 10:44:08.476560000 +0200
@@ -16,11 +16,13 @@
 	@$(MAKE) -C example all
 
 .PHONY: install
-install: libapriltag.so
+preinstall:
 	@chmod +x install.sh
+	@sed 's:^prefix=$$:prefix=$(PREFIX):' < apriltag.pc.in > apriltag.pc
+
+install: libapriltag.so
 	@./install.sh $(PREFIX)/lib libapriltag.so
 	@./install.sh $(PREFIX)/include/apriltag $(APRILTAG_HEADERS)
-	@sed 's:^prefix=$$:prefix=$(PREFIX):' < apriltag.pc.in > apriltag.pc
 	@./install.sh $(PREFIX)/lib/pkgconfig apriltag.pc
 	@rm apriltag.pc
 	@ldconfig