diff -Naur Wcalc-2.3.1/Makefile.am Wcalc-2.3.1.new/Makefile.am
--- Wcalc-2.3.1/Makefile.am	2007-02-25 21:09:18.000000000 -0500
+++ Wcalc-2.3.1.new/Makefile.am	2008-10-11 06:38:08.000000000 -0400
@@ -1,6 +1,7 @@
 bin_PROGRAMS = wcalc
 AM_YFLAGS = -dt
 #AM_LFLAGS = -w
+BUILT_SOURCES = parser.c
 wcalc_SOURCES = calculator.h variables.h string_manip.h help.h parser.y \
 		string_manip.h historyManager.h files.h conversion.h \
 		scanner.l help.c calculator.c string_manip.c historyManager.c \