[hb-view] Link with -lm

src/Makefile.am

diff --git a/src/Makefile.am b/src/Makefile.am
index 8e8319f..88aadf5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -118,7 +118,7 @@
 if HAVE_CAIRO_PNG
 hb_view_SOURCES = hb-view.c
 hb_view_CPPFLAGS = $(HBCFLAGS) $(CAIRO_FT_CFLAGS) $(CAIRO_PNG_CFLAGS)
-hb_view_LDADD = libharfbuzz.la $(HBLIBS) $(CAIRO_FT_LIBS) $(CAIRO_PNG_LIBS)
+hb_view_LDADD = libharfbuzz.la -lm $(HBLIBS) $(CAIRO_FT_LIBS) $(CAIRO_PNG_LIBS)
 bin_PROGRAMS += hb-view
 endif
 endif