$NetBSD: patch-app_depth_Makefile.am,v 1.1 2018/12/31 13:11:12 ryoon Exp $

--- app/depth/Makefile.am.orig	2007-10-25 10:14:01.000000000 +0000
+++ app/depth/Makefile.am
@@ -11,7 +11,8 @@ noinst_LTLIBRARIES = libdepth.la
 
 libdepth_la_LIBADD = \
 	$(top_builddir)/lib/libcinepaint.la \
-	$(GTK_LIBS)
+	$(GTK_LIBS) \
+	-lm
 
 libdepth_la_SOURCES = \
 	bezier_select.c \