[make] fix `make devsetup`

Reviewed By: jberdine

Differential Revision: D6298514

fbshipit-source-id: a2c5096

Makefile

@@ -589,7 +589,7 @@ endif
 devsetup: Makefile.autoconf
 	$(QUIET)[ $(OPAM) != "no" ] || (echo 'No `opam` found, aborting setup.' >&2; exit 1)
 	$(QUIET)$(call silent_on_success,installing $(OPAM_DEV_DEPS),\
-	  OPAMSWITCH=$(OPAMSWITCH); $(OPAM) pin remove --yes ocamlformat $(OPAM_DEV_DEPS)\
+	  OPAMSWITCH=$(OPAMSWITCH); $(OPAM) pin remove --yes ocamlformat; \
 	  OPAMSWITCH=$(OPAMSWITCH); $(OPAM) install --yes --no-checksum user-setup $(OPAM_DEV_DEPS))
 	$(QUIET)echo '$(TERM_INFO)*** Running `opam config setup -a`$(TERM_RESET)' >&2
 	$(QUIET)OPAMSWITCH=$(OPAMSWITCH); $(OPAM) config --yes setup -a