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)
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<div class='path'>path: <a href='/guix/log/?id=19e8a754181e78acde3ee8e0d201d4fe02d604f9'>root</a>/<a href='/guix/log/tests?id=19e8a754181e78acde3ee8e0d201d4fe02d604f9'>tests</a>/<a href='/guix/log/tests/channels.scm?id=19e8a754181e78acde3ee8e0d201d4fe02d604f9'>channels.scm</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/tests/channels.scm?id=19e8a754181e78acde3ee8e0d201d4fe02d604f9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-07 10:06:15 +0200'>2020-05-07</span></td><td><a href='/guix/commit/tests/channels.scm?id=053b10c3ef2df7ea80556ab9b2c93d0bf88094f2'>channels: Add mechanism to patch checkouts of the 'guix channel.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-23 10:38:44 +0200'>2019-09-23</span></td><td><a href='/guix/commit/tests/channels.scm?id=9719e8d37aaa63e1c8f9d4ab1e28d49e2e56d85b'>channels: Allow news entries to refer to a tag.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-23 10:38:44 +0200'>2019-09-23</span></td><td><a href='/guix/commit/tests/channels.scm?id=8ba7fd3cd6962f1c1aaaa5f71eed7f9222094f25'>channels: Add support for a news file.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-07-19 11:53:47 +0200'>2019-07-19</span></td><td><a href='/guix/commit/tests/channels.scm?id=ce5d9ec875156f3de7479e861731edf48c984c16'>channels: Always provide a &lt;channel-metadata&gt; record.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-07-19 11:53:47 +0200'>2019-07-19</span></td><td><a href='/guix/commit/tests/channels.scm?id=45b903323e0fecb7947926d2c14103d47fea624a'>channels: Strictly check the version of '.guix-channel'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-20 17:57:14 +0100'>2019-01-20</span></td><td><a href='/guix/commit/tests/channels.scm?id=1fafc383b1f04fcdaa49941f5bb64ac3008cfad8'>inferior: 'gexp-&gt;derivation-in-inferior' honors EXP's load path.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-20 17:57:14 +0100'>2019-01-20</span></td><td><a href='/guix/commit/tests/channels.scm?id=ed75bdf35ca494496cdbc7a06b414e1f08e70cac'>channels: Don't pull from the same channel more than once.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-09 13:55:22 +0100'>2018-12-09</span></td><td><a href='/guix/commit/tests/channels.scm?id=af12790bdd3805bbd7bca2b7c1d9045666f377eb'>guix: Add support for channel dependencies.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>