$NetBSD$

libdl is optional, and not usually present on non-Linux systems.

This is now solved a different way upstream.

--- src/frontend/qt_sdl/CMakeLists.txt.orig	2020-12-25 13:42:23.000000000 +0000
+++ src/frontend/qt_sdl/CMakeLists.txt
@@ -78,7 +78,11 @@ endif()
 
 if (UNIX)
     option(PORTABLE "Make a portable build that looks for its configuration in the current directory" OFF)
-    target_link_libraries(melonDS dl Qt5::Core Qt5::Gui Qt5::Widgets)
+    target_link_libraries(melonDS Qt5::Core Qt5::Gui Qt5::Widgets)
+    find_library(LIBDL NAMES dl)
+    if (LIBDL)
+        target_link_libraries(melonDS ${LIBDL})
+    endif()
 elseif (WIN32)
     option(PORTABLE "Make a portable build that looks for its configuration in the current directory" ON)
     target_sources(melonDS PUBLIC "${CMAKE_SOURCE_DIR}/melon.rc")