diff -Nru njplot-2.4/debian/changelog njplot-2.4/debian/changelog
--- njplot-2.4/debian/changelog	2012-01-04 12:02:42.000000000 +0200
+++ njplot-2.4/debian/changelog	2013-02-26 16:28:03.000000000 +0200
@@ -1,3 +1,9 @@
+njplot (2.4-1ubuntu1) raring; urgency=low
+
+  * Fix underlinking: link libm explicitly.
+
+ -- Graham Inggs <graham@nerve.org.za>  Tue, 26 Feb 2013 16:18:08 +0200
+
 njplot (2.4-1) unstable; urgency=low
 
   * New upstream release integrating Debian patches.
diff -Nru njplot-2.4/debian/patches/fix-underlinking.patch njplot-2.4/debian/patches/fix-underlinking.patch
--- njplot-2.4/debian/patches/fix-underlinking.patch	1970-01-01 02:00:00.000000000 +0200
+++ njplot-2.4/debian/patches/fix-underlinking.patch	2013-02-26 16:30:05.000000000 +0200
@@ -0,0 +1,16 @@
+--- a/makefile
++++ b/makefile
+@@ -23,11 +23,11 @@
+ 
+ njplot : $(OBJECTS)
+ 	$(CC) -o njplot $(OBJECTS) \
+-        -lvibrant -lncbi -lXm -lXt
++        -lvibrant -lncbi -lXm -lXt -lm
+         
+ unrooted : $(OBJUNROOTED)
+ 	$(CC) -o unrooted $(OBJUNROOTED) \
+-        -lvibrant -lncbi -lXm -lXt
++        -lvibrant -lncbi -lXm -lXt -lm
+ 
+ newicktops: njplot-vib.c
+ 	$(CC) -DNO_GUI  -DNO_PDF -o $@ njplot-vib.c -lm
diff -Nru njplot-2.4/debian/patches/series njplot-2.4/debian/patches/series
--- njplot-2.4/debian/patches/series	1970-01-01 02:00:00.000000000 +0200
+++ njplot-2.4/debian/patches/series	2013-02-26 16:28:18.000000000 +0200
@@ -0,0 +1 @@
+fix-underlinking.patch