Fix cmake config for POSITION_INDEPENDENT_CODE enabling it just when BUILD_SHARED_LIBS is ON
diff --git a/src/lib_json/CMakeLists.txt b/src/lib_json/CMakeLists.txt
index f0e9d0a..b7596e8 100644
--- a/src/lib_json/CMakeLists.txt
+++ b/src/lib_json/CMakeLists.txt
@@ -119,7 +119,7 @@
         OUTPUT_NAME jsoncpp
         VERSION ${PROJECT_VERSION}
         SOVERSION ${PROJECT_SOVERSION}
-        POSITION_INDEPENDENT_CODE ON
+        POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS}
     )
 
     # Set library's runtime search path on OSX
@@ -180,7 +180,7 @@
         OUTPUT_NAME jsoncpp
         VERSION ${PROJECT_VERSION}
         SOVERSION ${PROJECT_SOVERSION}
-        POSITION_INDEPENDENT_CODE ON
+        POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS}
     )
 
     # Set library's runtime search path on OSX