diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6c83e692..64aaaf945 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,8 @@ if (NOT DEVENDOR_LIBRARIES)
   add_subdirectory(extern/zlib EXCLUDE_FROM_ALL)
 
   include_directories(extern/zlib ${CMAKE_CURRENT_BINARY_DIR}/extern/zlib)
+else()
+  find_library(HAVE_Z z)
 endif()
 
 if (DEVENDOR_LIBRARIES)
@@ -38,7 +40,7 @@ if (DEVENDOR_LIBRARIES)
     include_directories(extern/imgui extern/IconFontCppHeaders extern/imgui/backends extern/igfd ${SDL_INCLUDE_DIR})
   else()
     find_package(SDL2 REQUIRED)
-    set(HAVE_SDL2 ${SDL2_LIBRARY})
+    set(HAVE_SDL2 ${SDL2_LIBRARIES})
     include_directories(extern/imgui extern/IconFontCppHeaders extern/imgui/backends extern/igfd ${SDL2_INCLUDE_DIRS})
   endif()
   find_library(HAVE_JACK jack)