EMACS ?= emacs
CASK ?= cask
CASK_EXEC ?= ${CASK} exec
-ORG_SOURCES = doi-utils.org org-ref.org pubmed.org
+ORG_SOURCES = org-ref.org pubmed.org
EL_TANGLED = ${ORG_SOURCES:.org=.el}
EL_SOURCES = arxiv.el jmax-bibtex.el
SOURCES = ${EL_TANGLED} ${EL_SOURCES}