diff -Naur pnm2ppa-1.12/pbm2ppa-0.8.6/Makefile pnm2ppa-1.12.oden/pbm2ppa-0.8.6/Makefile
--- pnm2ppa-1.12/pbm2ppa-0.8.6/Makefile	2008-12-25 21:16:01.000000000 +0100
+++ pnm2ppa-1.12.oden/pbm2ppa-0.8.6/Makefile	2008-12-25 21:17:11.000000000 +0100
@@ -1,5 +1,6 @@
 CC=gcc
 CFLAGS=$(RPM_OPT_FLAGS)
+LIBS=-lm
 LDFLAGS=
 PRINTER=HP720
 
@@ -20,10 +21,10 @@
 	rm -f *.o *~ pbmtpg pbm2ppa 
 
 pbm2ppa: pbm2ppa.o ppa.o pbm.o cutswath.o
-	$(CC) $(LDFLAGS) -o pbm2ppa pbm2ppa.o ppa.o pbm.o cutswath.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -o pbm2ppa pbm2ppa.o ppa.o pbm.o cutswath.o
 
 pbmtpg: pbmtpg.o
-	$(CC) $(CFLAGS) -o pbmtpg pbmtpg.o -lm
+	$(CC) $(CFLAGS) $(LDFLAGS) -o pbmtpg pbmtpg.o $(LIBS)
 
 .c.o: $*.c ppa.h pbm.h
 	$(CC) $(CFLAGS) -DDEFAULT_PRINTER=$(PRINTER)  -c $*.c