Build against the system's HIDAPI instead of the bundled one.

--- open-zwave-1.6-checkout/cpp/build/support.mk	2019-06-16 15:15:34.258331628 +0200
+++ open-zwave-1.6-checkout/cpp/build/support.mk	2019-06-16 15:15:54.698249462 +0200
@@ -86,6 +86,10 @@ endif
 endif
 SED    := sed
 
+# Build against the system's HIDAPI.
+CPPFLAGS += $(shell pkg-config hidapi-libusb --cflags)
+LDFLAGS  += $(shell pkg-config hidapi-libusb --libs)
+
 #determine if we are release or debug Build and set appropriate flags
 ifeq ($(BUILD), release)
 CFLAGS	+= -c $(RELEASE_CFLAGS)
m'><form method='get'>
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<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<div class='path'>path: <a href='/guix/log/?id=61361ef2646cc59f18fd1d33d9d13348930255b7'>root</a>/<a href='/guix/log/etc?id=61361ef2646cc59f18fd1d33d9d13348930255b7'>etc</a>/<a href='/guix/log/etc/openrc?id=61361ef2646cc59f18fd1d33d9d13348930255b7'>openrc</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/openrc?id=61361ef2646cc59f18fd1d33d9d13348930255b7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-09-17 14:10:42 +0200'>2020-09-17</span></td><td><a href='/guix/commit/etc/openrc?id=cabac732deffafc796537658a6c33c6c4aec821e'>guix-install.sh: Support OpenRC.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-install.sh (chk_init_sys): Detect OpenRC.
(sys_enable_guix_daemon): Install &amp; enable the Guix daemon on such
systems.
* etc/openrc/guix-daemon.in: New file.
* nix/local.mk: Add a rule for it.
(openrcservicedir, nodist_openrcservice_DATA): New variables.
(CLEANFILES, EXTRA_DIST): Add them.
* .gitignore: Ignore etc/openrc/guix-daemon.

Signed-off-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>Morgan Smith</td></tr>