From a9c52e1c7929e4134f18b8f502970bf4ee532861 Mon Sep 17 00:00:00 2001
From: Armin Novak <anovak@thincast.com>
Date: Fri, 10 Mar 2023 08:22:17 +0100
Subject: [PATCH] [cmake] manual cJSON detection

older builds do not ship the cmake files required for
find_package in their libcjson-dev package.
---
 libfreerdp/CMakeLists.txt | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/libfreerdp/CMakeLists.txt b/libfreerdp/CMakeLists.txt
index 94461645d..a656eac04 100644
--- a/libfreerdp/CMakeLists.txt
+++ b/libfreerdp/CMakeLists.txt
@@ -82,7 +82,30 @@ macro (freerdp_definition_add)
          set (LIBFREERDP_DEFINITIONS ${LIBFREERDP_DEFINITIONS} PARENT_SCOPE)
 endmacro()
 
-find_package(cJSON REQUIRED)
+find_package(cJSON)
+
+# some very enthusiastic packagers forgot to package the cJSONConfig.cmake
+# so try to find the paths manually
+if (NOT CJSON_FOUND)
+	message("falling back to manual cJSON detection")
+	find_file(CJSON_INCLUDE_HEADER
+		NAMES cJSON.h
+		PATH_SUFFIXES cjson
+		REQUIRED
+	)
+
+	# Extract the include base path from the header file path.
+	# first remove the filename, and then the last directory component as we expect
+        # somepath/cjson/cJSON.h (#include <cjson/cJSON.h>)
+	get_filename_component(CJSON_INCLUDE_DIRS ${CJSON_INCLUDE_HEADER} DIRECTORY)
+	get_filename_component(CJSON_INCLUDE_DIRS ${CJSON_INCLUDE_DIRS} DIRECTORY)
+
+	find_library(CJSON_LIBRARIES
+		NAMES cjson
+	       	REQUIRED
+	)
+endif()
+
 freerdp_include_directory_add(${CJSON_INCLUDE_DIRS})
 freerdp_library_add(${CJSON_LIBRARIES})