./configure --prefix=/usr tries to install logs in /usr/var/log, fails installation ("missing operand")

[lbeltrame]

Describe the bug
When configuring with --prefix=/usr, the Makefile is set up in a way that will try to create the log directory in /usr/var/log rather than /var/log. It will also fail (see output).

To Reproduce
Steps to reproduce the behavior:

1. ./configure --prefix=/usr
2. make
3. sudo make install

Expected behavior
Installation should finish and not try to create bogus directories.

Environment (please complete the following information):

• openSUSE Tumbleweed

Additional context

# sudo make install
[...]
 /usr/bin/mkdir -p '/usr/bin'
  /bin/sh ./libtool   --mode=install /usr/bin/install -c x52cli x52test x52evtest x52d '/usr/bin'
libtool: install: /usr/bin/install -c .libs/x52cli /usr/bin/x52cli
libtool: install: /usr/bin/install -c .libs/x52test /usr/bin/x52test
libtool: install: /usr/bin/install -c .libs/x52evtest /usr/bin/x52evtest
libtool: install: /usr/bin/install -c .libs/x52d /usr/bin/x52d
make  install-exec-hook
make[3]: Entering directory '/home/lb/Download/Sources/x52pro-linux'
/usr/bin/mkdir -p /usr/var/log
/usr/bin/mkdir -p 
/usr/bin/mkdir: missing operand
Try '/usr/bin/mkdir --help' for more information.

[lbeltrame]

The issue in Makefile (unfortunately I can't speak autotools):

install-exec-hook:
	$(MKDIR_P) $(DESTDIR)$(localstatedir)/log
	$(MKDIR_P) $(DESTDIR)$(runstatedir)

localstatedir is seen as a subdirectory of DESTDIR (but may not be), and runstatedir is undefined.

[lbeltrame]

That's because in some autotools version, runstatedir is not defined, see troglobit/sysklogd#6 for context, for example.

[nirenjan]

Thank you for the bug report. I've pushed a fix to the mouse-support branch, and should be able to get it into master once that branch is tested.

[nirenjan]

For what it's worth, autoconf defaults localstatedir to $(prefix)/var. I've also updated the build instructions to reflect that.

[lbeltrame]

I confirm that the issue is no longer present in mouse-support as I've been obviously been able to test that.

[nirenjan]

Fix merged to master branch.