Taken from the Debian package.

From 7be4a19b76d98260cf95040a47935f854a4ba7a4 Mon Sep 17 00:00:00 2001
From: Valentin Rusu <kde@rusu.info>
Date: Sat, 17 Dec 2011 13:47:58 +0100
Subject: [PATCH] Fix .pc file by adding clucene-shared library

---
 src/core/libclucene-core.pc.cmake |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/src/core/libclucene-core.pc.cmake
+++ b/src/core/libclucene-core.pc.cmake
@@ -6,6 +6,6 @@ includedir=${prefix}/include:${prefix}/i
 Name: libclucene
 Description: CLucene - a C++ search engine, ported from the popular Apache Lucene
 Version: @CLUCENE_VERSION_MAJOR@.@CLUCENE_VERSION_MINOR@.@CLUCENE_VERSION_REVISION@.@CLUCENE_VERSION_PATCH@
-Libs: -L${prefix}/@LIB_DESTINATION@/ -lclucene-core
+Libs: -L${prefix}/@LIB_DESTINATION@/ -lclucene-core -lclucene-shared
 Cflags: -I${prefix}/include -I${prefix}/include/CLucene/ext
 ~
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<tr><td><span title='2020-11-25 12:01:51 -0600'>2020-11-25</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=ef1bc776767aa7c095c7407e3092dbdaea4e1f80'>gnu: re2: Update to 2020-11-01.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2020-11-01.
</span></span></td><td>Brett Gilio</td></tr>
<tr><td><span title='2020-07-24 21:08:35 +0200'>2020-07-24</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=8e619343691a3902a0af2d0fffead4d35b3d4053'>gnu: re2: Update to 2020-07-06.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2020-07-06.
[source](modules, snippet): Remove.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-06-03 06:46:31 +0200'>2020-06-03</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=0c58139c9a91953d089cb39b9b856409c4975a7b'>gnu: re2: Update to 2020-06-01.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2020-06-01.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-05-11 21:55:01 +0200'>2020-05-11</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=16fbbf6a85eeefda2bec987d279b097f34fdc5f4'>gnu: re2: Update to 2020-05-01.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2020-05-01.
[source](modules, snippet): New fields.
* gnu/packages/chromium.scm (ungoogled-chromium)[arguments]: Add substitution
to adjust for re2 API change.
* gnu/packages/qt.scm (qtwebengine)[arguments]: Likewise.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-03-04 22:06:23 +0100'>2020-03-04</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=e26c4a7e4e5e8862250a89c0d17d74530db8bd00'>gnu: re2: Update to 2020-03-03.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2020-03-03.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-01-20 21:53:51 +0100'>2020-01-20</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=bb06336e818c5ea8af6a48c0070a1bd58fcbded5'>gnu: re2: Update to 2020-01-01.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2020-01-01.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-12-11 01:13:24 +0100'>2019-12-11</span></td><td><a href='/guix/commit/gnu/packages/regex.scm?id=818b956b427a9083bdd5fef9c7b57ee6bbe75cd7'>gnu: re2: Update to 2019-12-01.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/regex.scm (re2): Update to 2019-12-01.
</span></span></td><td>Marius Bakke</td></tr>