Taken from upstream: https://github.com/open-source-parsers/jsoncpp/issues/1235.

From ac2870298ed5b5a96a688d9df07461b31f83e906 Mon Sep 17 00:00:00 2001
From: Derick Vigne <derickvigne@me.com>
Date: Tue, 26 Jan 2021 14:59:12 -0500
Subject: [PATCH] Fixed pkg-config Version

---
 pkg-config/jsoncpp.pc.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkg-config/jsoncpp.pc.in b/pkg-config/jsoncpp.pc.in
index 632a377f5..2a2221069 100644
--- a/pkg-config/jsoncpp.pc.in
+++ b/pkg-config/jsoncpp.pc.in
@@ -5,7 +5,7 @@ includedir=@includedir_for_pc_file@
 
 Name: jsoncpp
 Description: A C++ library for interacting with JSON
-Version: @JSONCPP_VERSION@
+Version: @PROJECT_VERSION@
 URL: https://github.com/open-source-parsers/jsoncpp
 Libs: -L${libdir} -ljsoncpp
 Cflags: -I${includedir}
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<tr><td><span title='2023-03-22 10:31:15 +0200'>2023-03-22</span></td><td><a href='/guix/commit/gnu/packages/mastodon.scm?id=37664e1cecceb82e7922ddac7af52eaf5fcb1301'>gnu: toot: Update to 0.36.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mastodon.scm (toot): Update to 0.36.0.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-03-08 08:54:31 +0200'>2023-03-08</span></td><td><a href='/guix/commit/gnu/packages/mastodon.scm?id=034a5f2e861cb85a1a3b2108b0cee37ae28fd3f5'>gnu: toot: Update to 0.35.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mastodon.scm (toot): Update to 0.35.0.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-12-18 21:44:15 +0200'>2022-12-18</span></td><td><a href='/guix/commit/gnu/packages/mastodon.scm?id=710c8f159f314e58c3328eae076ae84a5b4960c4'>gnu: toot: Update to 0.32.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mastodon.scm (toot): Update to 0.32.1.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-12-06 10:58:08 +0200'>2022-12-06</span></td><td><a href='/guix/commit/gnu/packages/mastodon.scm?id=f34ccd506e6594ad253f3f8d1c03171e7520a4b9'>gnu: toot: Update to 0.30.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mastodon.scm (toot): Update to 0.30.1.
[arguments]: Add a phase to remove integration tests.
</span></span></td><td>Efraim Flashner</td></tr>