--- netcdf-4.1.2/libsrc4/Makefile.in.libm	2011-03-29 17:14:04.000000000 -0600
+++ netcdf-4.1.2/libsrc4/Makefile.in	2011-03-31 11:09:36.683165942 -0600
@@ -312,7 +312,7 @@
 # Tell libtool what libraries are we will depend on.
 
 # Always link to hdf5_hl, hdf5, and z.
-libnetcdf4_la_LIBADD = $(am__append_12) $(am__append_13) -lhdf5_hl \
+libnetcdf4_la_LIBADD = -lm $(am__append_12) $(am__append_13) -lhdf5_hl \
 	-lhdf5 -lz
 all: all-am