--- Makefile.in.orig	2000-01-10 20:54:05.000000000 -0500
+++ Makefile.in	2014-08-16 12:36:54.000000000 -0400
@@ -14,10 +14,10 @@
 #   Pavel@Xerox.Com
 
 CC = @CC@
-LIBRARIES = @LIBS@
+LIBRARIES = @LIBS@ -lm
 YACC = @YACC@
 
-CFLAGS = -O
+CFLAGS?= -O
 # If you're using GCC, you may prefer:
 # CFLAGS = -O2 -finline-functions
 #