Add PATH_SUFFIXES to look inside the sub-directory `vlc` - the original statement
only check for `vlc.h` inside the directory `include`, `bin`, etc.
In Guix, however, `vlc.h` lies inside `/gnu/store/<hash>-vlc-x.y.z/include/vlc/vlc.h`

--- a/cmake/modules/FindLIBVLC.cmake
+++ b/cmake/modules/FindLIBVLC.cmake
@@ -29,7 +29,7 @@ FIND_PATH(LIBVLC_INCLUDE_DIR vlc/vlc.h
   c:/msys/local/include
   NO_DEFAULT_PATH
   )
-FIND_PATH(LIBVLC_INCLUDE_DIR vlc.h)
+FIND_PATH(LIBVLC_INCLUDE_DIR vlc.h PATH_SUFFIXES vlc)
 
 #Put here path to custom location
 #example: /home/user/vlc/lib etc..
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<div class='path'>path: <a href='/guix/log/?id=da4006d474280f0f20449176c20b148855359194'>root</a>/<a href='/guix/log/gnu?id=da4006d474280f0f20449176c20b148855359194'>gnu</a>/<a href='/guix/log/gnu/services?id=da4006d474280f0f20449176c20b148855359194'>services</a>/<a href='/guix/log/gnu/services/vnc.scm?id=da4006d474280f0f20449176c20b148855359194'>vnc.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/gnu/services/vnc.scm?id=da4006d474280f0f20449176c20b148855359194&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-11-27 10:55:51 -0500'>2023-11-27</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=dce3672f5a8eb440ae61a334384423d1e2ff5e65'>services: xvnc: Do not specify display number when using inetd.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm (xvnc-configuration-&gt;command-line-arguments): Omit X
display number when inetd? is #t.

Change-Id: I0fc8e3068f3ae22421e60e96bd40e3b6e477ca99
</span></span></td><td>David Thompson</td></tr>
<tr><td><span title='2023-05-21 01:04:39 +0200'>2023-05-21</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=896a51258aa71a483d8f6be29169098de5967baa'>services: Transient inetd services inherit requirements.</a><span class='msg-avail'>...<span class='msg-tooltip'>That way, per-connection transient services such as 'sshd-123' inherit
dependencies of their "parent" ('sshd' in this example), which is more
consistent than not depending on anything.

* gnu/services/dict.scm (dicod-shepherd-service): Pass #:requirements to
'make-inetd-constructor'.
* gnu/services/messaging.scm (bitlbee-shepherd-service): Likewise.
* gnu/services/ssh.scm (openssh-shepherd-service): Likewise.
* gnu/services/vnc.scm (xvnc-shepherd-service): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-04-02 23:35:15 -0400'>2023-04-02</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=1d0158ab9036cff7737cbfb1678f876ae67c4ac2'>services: xvnc: Do not create a regular HOME directory for xvnc user.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm (%xvnc-accounts)
[home-directory]: Define as /var/empty.
[shell]: Set to nologin, for good measures.
</span></span></td><td>Maxim Cournoyer</td></tr>