diff --git a/hw/xquartz/mach-startup/Makefile.am b/hw/xquartz/mach-startup/Makefile.am
index 19b5b8cc2..557cbc1da 100644
--- a/hw/xquartz/mach-startup/Makefile.am
+++ b/hw/xquartz/mach-startup/Makefile.am
@@ -15,13 +15,6 @@ dist_X11_bin_SOURCES = \
 dist_X11_SOURCES = \
 	bundle_trampoline.c
 
-# strndup(3) was added in Mac OS X 10.7, but we do this unconditionally to deal
-# with the case where we build on Lion but target Snow Leopard as the minimum
-# OS version.
-#if NEED_STRNDUP
-dist_X11_bin_SOURCES += $(top_srcdir)/os/strndup.c
-#endif
-
 nodist_X11_bin_SOURCES = \
 	mach_startupServer.c \
 	mach_startupUser.c