updated build system

cmake/libraries/libsodium.cmake

@@ -1,16 +1,22 @@
 if(PROJECT_ENABLE_LIBSODIUM)
   if(PROJECT_BUILD)
-    pkg_check_modules(SODIUM libsodium=${LIBSODIUM_VERSION} REQUIRED)
-
     add_definitions(-DPROJECT_ENABLE_LIBSODIUM)
 
+    pkg_check_modules(SODIUM libsodium=${LIBSODIUM_VERSION} REQUIRED)
+
     include_directories(BEFORE SYSTEM
       ${SODIUM_INCLUDE_DIRS}
     )
 
-    link_libraries(
-      ${SODIUM_LINK_LIBRARIES}
-    )
+    if(PROJECT_BUILD_SHARED_LIBS)
+      link_libraries(
+        ${SODIUM_LINK_LIBRARIES}
+      )
+    else()
+      link_libraries(
+        ${SODIUM_STATIC_LINK_LIBRARIES}
+      )
+    endif()
   elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
     if(PROJECT_IS_MINGW)
       set(LIBSODIUM_TYPE mingw64)