Use fltk-config to avoid static library

plugins/zynaddsubfx/CMakeLists.txt

@@ -153,20 +153,23 @@ SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${PLUGIN_DIR}")
 SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 ADD_EXECUTABLE(RemoteZynAddSubFx RemoteZynAddSubFx.cpp "${WINRC}")
 INSTALL(TARGETS RemoteZynAddSubFx RUNTIME DESTINATION "${PLUGIN_DIR}")
-SET(FLTK_FILTERED_LIBRARIES ${FLTK_LIBRARIES})
-LIST(REMOVE_ITEM FLTK_FILTERED_LIBRARIES "${X11_X11_LIB}" "${X11_Xext_LIB}")
-TARGET_LINK_LIBRARIES(RemoteZynAddSubFx zynaddsubfx_gui ZynAddSubFxCore ${FLTK_FILTERED_LIBRARIES} -lpthread )
+
+# Remove useless dependencies from FLTK. Use fltk-config to avoid static library
+# in older environments
+SET(FLTK_FILTERED_LDFLAGS ${FLTK_LIBRARIES})
+FIND_PROGRAM(FLTK_CONFIG fltk-config)
+IF(FLTK_CONFIG AND NOT (LMMS_BUILD_APPLE OR LMMS_BUILD_WIN32))
+	EXECUTE_PROCESS(COMMAND ${FLTK_CONFIG} --ldflags OUTPUT_VARIABLE FLTK_FILTERED_LDFLAGS OUTPUT_STRIP_TRAILING_WHITESPACE)
+	STRING(REPLACE " " ";" FLTK_FILTERED_LDFLAGS ${FLTK_FILTERED_LDFLAGS})
+	LIST(REMOVE_ITEM FLTK_FILTERED_LDFLAGS -lX11)
+ENDIF()
+TARGET_LINK_LIBRARIES(RemoteZynAddSubFx zynaddsubfx_gui ZynAddSubFxCore ${FLTK_FILTERED_LDFLAGS} -lpthread )
 
 # link Qt libraries when on win32
 IF(LMMS_BUILD_WIN32)
 	TARGET_LINK_LIBRARIES(RemoteZynAddSubFx ${QT_LIBRARIES})
 ENDIF(LMMS_BUILD_WIN32)
 
-# FLTK needs X (is libdl not linked in libfltk?)
-IF(LMMS_BUILD_LINUX)
-#	TARGET_LINK_LIBRARIES(RemoteZynAddSubFx ${CMAKE_DL_LIBS})
-ENDIF(LMMS_BUILD_LINUX)
-
 
 IF(LMMS_BUILD_WIN32)
 	ADD_CUSTOM_COMMAND(TARGET ZynAddSubFxCore POST_BUILD COMMAND "${STRIP}" \"$<TARGET_FILE:ZynAddSubFxCore>\")