Fix build when an optional dependency is missing

Zzull · Zzull · commit 0e0066a83b41 · 2021-07-12T11:30:01.000+02:00
See ocaml/dune#4065
diff --git a/src/Makefile b/src/Makefile
@@ -1,7 +1,7 @@
 include ../Makefile.config
 
 all: confs
-	dune build
+	dune build @install
 
 ### CONF ####
 
