nixpkgs/pkgs/applications/editors/emacs/clean-env.patch

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Dump temacs in an empty environment to prevent -dev paths from ending
up in the dumped image.
diff -ru -x '*~' emacs-25.3/src/Makefile.in emacs-25.3-new/src/Makefile.in
--- emacs-25.3/src/Makefile.in 2017-04-14 17:02:47.000000000 +0200
+++ emacs-25.3-new/src/Makefile.in 2017-09-25 19:03:02.173861038 +0200
@@ -532,7 +532,7 @@
ifeq ($(CANNOT_DUMP),yes)
ln -f temacs$(EXEEXT) $@
else
- LC_ALL=C $(RUN_TEMACS) -batch -l loadup dump
+ env -i LC_ALL=C $(RUN_TEMACS) -batch -l loadup dump
ifneq ($(PAXCTL_dumped),)
$(PAXCTL_dumped) $@
endif