diff --git a/.travis.yml b/.travis.yml
index b6bbb76..4daaa67 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,5 +28,5 @@ script:
   - mkdir tmp
   - cd tmp
   - cmake ..
-  - make
+  - make -j4
   - ../build/MaddyTests
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 70f723f..ec6649f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,10 +60,9 @@ add_subdirectory(libs)
 
 # ------------------------------------------------------------------------------
 
-include_directories(
-  ${LIBS_INCLUDE_DIRS}
+add_library(maddy INTERFACE)
+target_include_directories(maddy INTERFACE
   ${MADDY_INCLUDE_DIR}
-  ${CMAKE_CURRENT_SOURCE_DIR}/tests
 )
 
 # ------------------------------------------------------------------------------
@@ -73,5 +72,9 @@ add_executable(
     ${MADDY_TESTS_FILES}
     ${CMAKE_CURRENT_SOURCE_DIR}/tests/main.cpp
 )
-target_link_libraries(MaddyTests gmock_main)
+target_include_directories(MaddyTests PUBLIC
+  ${LIBS_INCLUDE_DIRS}
+  ${CMAKE_CURRENT_SOURCE_DIR}/tests
+)
+target_link_libraries(MaddyTests maddy gmock_main)
 add_test(MaddyTests ${CMAKE_CURRENT_SOURCE_DIR}/build/MaddyTests)
diff --git a/LICENSE b/LICENSE
index 2333dfd..3879e0d 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright 2017, 2018, 2019 M. Petra Baranski
+Copyright 2017, 2018, 2019, 2020 M. Petra Baranski
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in