diff --git a/.gitignore b/.gitignore
index 7dacb0b67..5cc4ee735 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,7 +42,6 @@ jsoncpp_lib_static.dir/
 /src/Makefile
 /src/jsontestrunner/Makefile
 /src/jsontestrunner/jsontestrunner_exe
-/src/lib_json/Makefile
 /src/test_lib_json/Makefile
 /src/test_lib_json/jsoncpp_test
 
@@ -50,3 +49,7 @@ jsoncpp_lib_static.dir/
 .project
 .cproject
 /.settings/
+
+# CyberCalc custom build
+src/lib_json/*.a
+src/lib_json/*.o
diff --git a/src/lib_json/Makefile b/src/lib_json/Makefile
new file mode 100644
index 000000000..4599dd81b
--- /dev/null
+++ b/src/lib_json/Makefile
@@ -0,0 +1,13 @@
+HEADERS=json_tool.h ../../include/json/allocator.h ../../include/json/assertions.h ../../include/json/autolink.h ../../include/json/config.h ../../include/json/features.h ../../include/json/forwards.h ../../include/json/json.h ../../include/json/reader.h ../../include/json/value.h ../../include/json/version.h ../../include/json/writer.h
+OBJECTS=json_reader.o json_value.o json_writer.o
+
+default: libjsoncpp.a
+
+%.o: %.cpp $(HEADERS)
+	g++ -c -I../../include -o $@ $<
+
+libjsoncpp.a: $(OBJECTS)
+	ar rcs libjsoncpp.a $(OBJECTS)
+
+clean:
+	rm -f libjsoncpp.a $(OBJECTS)