fix parallel build issue Build randomly fails since December 2017 on buildroot (http://autobuild.buildroot.org/?reason=ecryptfs-utils-111): make[5]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/ecryptfs-utils-111/src/utils' /bin/mkdir -p '/home/buildroot/autobuild/instance-2/output-1/target/sbin' /bin/bash ../../libtool --mode=install /usr/bin/install -c mount.ecryptfs umount.ecryptfs mount.ecryptfs_private '/home/buildroot/autobuild/instance-2/output-1/target/sbin' libtool: install: /usr/bin/install -c mount.ecryptfs /home/buildroot/autobuild/instance-2/output-1/target/sbin/mount.ecryptfs /usr/bin/install: cannot create regular file '/home/buildroot/autobuild/instance-2/output-1/target/sbin/mount.ecryptfs': File exists Makefile:832: recipe for target 'install-rootsbinPROGRAMS' failed make[5]: *** [install-rootsbinPROGRAMS] Error 1 As spotted by Thomas Petazzoni, build failure happens because of the following line in src/utils/Makefile.am: install-exec-hook: install-rootsbinPROGRAMS -rm -f "$(DESTDIR)/$(rootsbindir)/umount.ecryptfs_private" $(LN_S) "mount.ecryptfs_private" "$(DESTDIR)/$(rootsbindir)/umount.ecryptfs_private" The install-exec-hook target should not have a dependency on install-rootsbinPROGRAMS. From https://www.gnu.org/software/automake/manual/html_node/Extending.html#Extending: """ In contrast, some rules also have a way to run another rule, called a hook; hooks are always executed after the main rule’s work is done. The hook is named after the principal target, with ‘-hook’ appended. The targets allowing hooks are install-data, install-exec, uninstall, dist, and distcheck. For instance, here is how to create a hard link to an installed program: install-exec-hook: ln $(DESTDIR)$(bindir)/program$(EXEEXT) \ $(DESTDIR)$(bindir)/proglink$(EXEEXT) """ So, they explicitly say that these hooks are run after the main rule work is done, which means the dependency on install-rootsbinPROGRAMS is not needed. And the example they use to illustrate is *exactly* the situation of ecryptfs-utils: creating a link to a program that was installed. Signed-off-by: Fabrice Fontaine [Upstream status: https://bugs.launchpad.net/ecryptfs/+bug/1857622] diff -Nuar ecryptfs-utils-111-orig/src/utils/Makefile.in ecryptfs-utils-111/src/utils/Makefile.in --- ecryptfs-utils-111-orig/src/utils/Makefile.in 2019-12-26 15:14:16.656146065 +0100 +++ ecryptfs-utils-111/src/utils/Makefile.in 2019-12-26 17:36:07.108496164 +0100 @@ -1522,7 +1522,7 @@ .PRECIOUS: Makefile -install-exec-hook: install-rootsbinPROGRAMS +install-exec-hook: -rm -f "$(DESTDIR)/$(rootsbindir)/umount.ecryptfs_private" $(LN_S) "mount.ecryptfs_private" "$(DESTDIR)/$(rootsbindir)/umount.ecryptfs_private"