gnu: Add jsoncpp-with-pkg-version.

* gnu/packages/patches/jsoncpp-pkg-config-version: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/serialization.scm (jsoncpp-with-pkg-version): New variable.

gnu/local.mk

@@ -1267,6 +1267,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/json-c-CVE-2020-12762.patch		\
   %D%/packages/patches/json-c-0.13-CVE-2020-12762.patch	\
   %D%/packages/patches/json-c-0.12-CVE-2020-12762.patch	\
+  %D%/packages/patches/jsoncpp-pkg-config-version.patch		\
   %D%/packages/patches/jacal-fix-texinfo.patch			\
   %D%/packages/patches/jamvm-1.5.1-aarch64-support.patch	\
   %D%/packages/patches/jamvm-1.5.1-armv7-support.patch	\

gnu/packages/patches/jsoncpp-pkg-config-version.patch

@@ -0,0 +1,24 @@
+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}

gnu/packages/serialization.scm

@@ -454,6 +454,25 @@ preserve existing comment in unserialization/serialization steps, making
 it a convenient format to store user input files.")
     (license license:expat)))
 
+;; XXX: TODO(core-updates): Remove this package and apply the patch to the
+;; jsoncpp package.  This patch fixes the package version declared in the
+;; pkg-config file.
+(define-public jsoncpp-with-pkg-version
+  (package
+    (inherit jsoncpp)
+    (name "jsoncpp")
+    (version "1.9.4")
+    (home-page "https://github.com/open-source-parsers/jsoncpp")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference (url home-page) (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0qnx5y6c90fphl9mj9d20j2dfgy6s5yr5l0xnzid0vh71zrp6jwv"))
+              (patches
+               (search-patches "jsoncpp-pkg-config-version.patch"))))))
+
 ;; Tensorflow does not build with jsoncpp 1.8.x.  It is built with commit
 ;; 4356d9bba191e1e16ce7a92073cbf3e63564e973, which lies between version 1.7.2
 ;; and 1.7.3.