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diff -up mutt-1.10.0/configure.ac.nodotlock mutt-1.10.0/configure.ac
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--- mutt-1.10.0/configure.ac.nodotlock	2018-05-14 23:51:53.000000000 +0200
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+++ mutt-1.10.0/configure.ac	2018-05-23 15:09:21.186613968 +0200
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@@ -528,9 +528,7 @@ int main (int argc, char **argv)
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 }]])],[mutt_cv_worldwrite=yes],[mutt_cv_worldwrite=no],[mutt_cv_worldwrite=no])])
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         mutt_cv_setgid=no
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-        if test $mutt_cv_worldwrite = yes; then
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-                AC_DEFINE(USE_DOTLOCK,1,[ Define to use dotlocking for mailboxes. ])
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-        else
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+        if test $mutt_cv_worldwrite != yes; then
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                 AC_CACHE_CHECK(if $mutt_cv_mailpath is group writable, mutt_cv_groupwrite, [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <sys/types.h>
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 #include <sys/stat.h>
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@@ -546,7 +544,6 @@ int main (int argc, char **argv)
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 }]])],[mutt_cv_groupwrite=yes],[mutt_cv_groupwrite=no],[mutt_cv_groupwrite=no])])
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                 if test $mutt_cv_groupwrite = yes; then
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-                        AC_DEFINE(USE_DOTLOCK,1,[ Define to use dotlocking for mailboxes. ])
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                         AC_DEFINE(USE_SETGID,1,[ Define if mutt should run setgid "mail". ])
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                         mutt_cv_setgid=yes
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                 fi
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diff -up mutt-1.10.0/Makefile.am.nodotlock mutt-1.10.0/Makefile.am
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--- mutt-1.10.0/Makefile.am.nodotlock	2018-05-23 15:11:05.477977659 +0200
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+++ mutt-1.10.0/Makefile.am	2018-05-23 15:11:20.252170843 +0200
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@@ -154,17 +154,6 @@ hcversion.h: $(srcdir)/mutt.h $(srcdir)/
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 patchlist.c: $(srcdir)/PATCHES $(srcdir)/patchlist.sh
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 	$(srcdir)/patchlist.sh < $(srcdir)/PATCHES > patchlist.c
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-install-exec-hook:
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-	if test -f $(DESTDIR)$(bindir)/mutt.dotlock && test -f $(DESTDIR)$(bindir)/mutt_dotlock ; then	\
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-		rm -f $(DESTDIR)$(bindir)/mutt.dotlock ;		\
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-		ln -sf $(DESTDIR)$(bindir)/mutt_dotlock $(DESTDIR)$(bindir)/mutt.dotlock ; \
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-	fi
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-	if test -f $(DESTDIR)$(bindir)/mutt_dotlock && test x$(DOTLOCK_GROUP) != x ; then \
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-		chgrp $(DOTLOCK_GROUP) $(DESTDIR)$(bindir)/mutt_dotlock && \
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-		chmod $(DOTLOCK_PERMISSION) $(DESTDIR)$(bindir)/mutt_dotlock || \
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-		{ echo "Can't fix mutt_dotlock's permissions!  This is required to lock mailboxes in the mail spool directory." >&2 ; exit 1 ; } \
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-	fi
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-
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 install-data-local:
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 	$(MKDIR_P) $(DESTDIR)$(sysconfdir)
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 	$(INSTALL) -m 644 $(srcdir)/mime.types $(DESTDIR)$(sysconfdir)/mime.types.dist