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='2020-03-05 23:36:04 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/packages/patches/clang-runtime-9-libsanitizer-mode-field.patch?id=af88972bb8e3e69d9c5ea5a8a81f7f234c971133'>gnu: clang-runtime: Fix build with glibc 2.31.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/clang-runtime-3.8-libsanitizer-mode-field.patch,
gnu/packages/patches/clang-runtime-3.9-libsanitizer-mode-field.patch,
gnu/packages/patches/clang-runtime-9-libsanitizer-mode-field.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/llvm.scm (clang-runtime, clang-runtime-8, clang-runtime-7,
clang-runtime-6, clang-runtime-3.9.1, clang-runtime-3.8, clang-runtime-3.7):
Add the respective patches.
</span></span></td><td>Marius Bakke</td></tr>