diff --git a/externals/Makefile b/externals/Makefile
index f18d8cfa39cdc8500660abfae3cb78732fd561f7..4669ef869eb56c821f2803a15778b9810042f240 100644
--- a/externals/Makefile
+++ b/externals/Makefile
@@ -43,7 +43,8 @@ DEST_PATHS = BUILDLAYOUT_DIR=$(BUILDLAYOUT_DIR) \
 # this variable is to support old "win" directories, rather than "windows"
 BUILDSRC_OS_NAME = $(OS_NAME)
 
-CFLAGS = -DPD -I$(pd_src)/src -Wall -W $(DEBUG_CFLAGS) -I$(gem_src)/src
+WARN_FLAGS = -Wall -W -Wno-unused-parameter
+CFLAGS = -DPD -I$(pd_src)/src $(WARN_FLAGS) $(DEBUG_CFLAGS) -I$(gem_src)/src
 LDFLAGS =  
 LIBS = -lm