diff --git a/CMakeLists.txt b/CMakeLists.txt
index ccd91385..b926b6fd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -488,16 +488,16 @@ endif()
 if(TARGET SDL2::SDL2)
 	# CMake-generated config (Arch, vcpkg, Raspbian)
 	message(STATUS "Using system SDL2")
-	target_link_libraries(CSE2 SDL2::SDL2 SDL2::SDL2main)
+	target_link_libraries(CSE2 PRIVATE SDL2::SDL2 SDL2::SDL2main)
 elseif(TARGET SDL2::SDL2-static)
 	# CMake-generated config (Arch, vcpkg, Raspbian)
 	message(STATUS "Using system SDL2")
-	target_link_libraries(CSE2 SDL2::SDL2-static SDL2::SDL2main)
+	target_link_libraries(CSE2 PRIVATE SDL2::SDL2-static SDL2::SDL2main)
 elseif(SDL2_FOUND)
 	# Autotools-generated config (MSYS2)
 	message(STATUS "Using system SDL2")
 	target_include_directories(CSE2 PRIVATE ${SDL2_INCLUDE_DIRS})
-	target_link_libraries(CSE2 ${SDL2_LIBRARIES})
+	target_link_libraries(CSE2 PRIVATE ${SDL2_LIBRARIES})
 else()
 	# Compile it ourselves
 	message(STATUS "Using local SDL2")
@@ -506,7 +506,7 @@ else()
 		set(LIBC ON)	# Needed to prevent possible 'symbol already defined' errors
 	endif()
 	add_subdirectory("external/SDL2" EXCLUDE_FROM_ALL)
-	target_link_libraries(CSE2 SDL2-static SDL2main)
+	target_link_libraries(CSE2 PRIVATE SDL2-static SDL2main)
 endif()
 
 if(NOT FORCE_LOCAL_LIBS)
@@ -516,7 +516,7 @@ endif()
 if(FREETYPE_FOUND)
 	message(STATUS "Using system FreeType")
 	target_include_directories(CSE2 PRIVATE ${FREETYPE_INCLUDE_DIRS})
-	target_link_libraries(CSE2 ${FREETYPE_LIBRARIES})
+	target_link_libraries(CSE2 PRIVATE ${FREETYPE_LIBRARIES})
 else()
 	# Compile it ourselves
 	message(STATUS "Using local FreeType")
@@ -527,7 +527,7 @@ else()
 		set(CMAKE_DISABLE_FIND_PACKAGE_BZip2 ON)
 	endif()
 	add_subdirectory("external/freetype" EXCLUDE_FROM_ALL)
-	target_link_libraries(CSE2 freetype)
+	target_link_libraries(CSE2 PRIVATE freetype)
 endif()
 
 if(RENDERER MATCHES "OpenGL3")
@@ -535,13 +535,13 @@ if(RENDERER MATCHES "OpenGL3")
 	target_include_directories(CSE2 PRIVATE "external/glad/include")
 
 	find_package(OpenGL REQUIRED)
-	target_link_libraries(CSE2 OpenGL::GL ${CMAKE_DL_LIBS})
+	target_link_libraries(CSE2 PRIVATE OpenGL::GL ${CMAKE_DL_LIBS})
 endif()
 
 if(RENDERER MATCHES "OpenGLES2")
 	find_package(OpenGLES2 REQUIRED)
 	target_include_directories(CSE2 PRIVATE ${OPENGLES2_INCLUDE_DIR})
-	target_link_libraries(CSE2 ${OPENGLES2_LIBRARIES})
+	target_link_libraries(CSE2 PRIVATE ${OPENGLES2_LIBRARIES})
 endif()
 
 ##
diff --git a/DoConfig/CMakeLists.txt b/DoConfig/CMakeLists.txt
index f395045d..5f8f1766 100644
--- a/DoConfig/CMakeLists.txt
+++ b/DoConfig/CMakeLists.txt
@@ -122,7 +122,7 @@ endif()
 if(FLTK_FOUND)
 	message(STATUS "Using system FLTK")
 	target_include_directories(DoConfig PRIVATE ${FLTK_INCLUDE_DIR})
-	target_link_libraries(DoConfig ${FLTK_LIBRARIES})
+	target_link_libraries(DoConfig PRIVATE ${FLTK_LIBRARIES})
 else()
 	# Compile it ourselves
 	message(STATUS "Using local FLTK")
@@ -139,7 +139,7 @@ else()
 	add_subdirectory("fltk" EXCLUDE_FROM_ALL)
 	get_target_property(DIRS fltk INCLUDE_DIRECTORIES)	# FLTK doesn't mark its includes as PUBLIC or INTERFACE, so we have to do this stupidity
 	target_include_directories(DoConfig PRIVATE ${DIRS})
-	target_link_libraries(DoConfig fltk)
+	target_link_libraries(DoConfig PRIVATE fltk)
 endif()
 
 # Enable link-time optimisation if available