Index: qhull-2009.1/src/Makefile.in
===================================================================
--- qhull-2009.1.orig/src/Makefile.in	2011-09-18 23:32:27.000000000 -0400
+++ qhull-2009.1/src/Makefile.in	2011-09-18 23:36:30.000000000 -0400
@@ -262,12 +262,12 @@
 qhalf_SOURCES = qhalf.c
 
 # how:
-qhull_LDADD = libqhull.la
-rbox_LDADD = libqhull.la
-qconvex_LDADD = libqhull.la
-qdelaunay_LDADD = libqhull.la
-qvoronoi_LDADD = libqhull.la
-qhalf_LDADD = libqhull.la
+qhull_LDADD = libqhull.la -lm
+rbox_LDADD = libqhull.la -lm
+qconvex_LDADD = libqhull.la -lm
+qdelaunay_LDADD = libqhull.la -lm
+qvoronoi_LDADD = libqhull.la -lm
+qhalf_LDADD = libqhull.la -lm
 
 ### Include files
 pkginclude_HEADERS = \
