Adapted from https://sources.debian.org/src/maradns/2.0.13-1.4/debian/patches/deadwood_makefile.patch/

diff --git a/deadwood-3.5.0020/src/Makefile.ubuntu2004 b/deadwood-3.5.0020/src/Makefile.ubuntu2004
index 62868aa..2c8c094 100644
--- a/deadwood-3.5.0020/src/Makefile.ubuntu2004
+++ b/deadwood-3.5.0020/src/Makefile.ubuntu2004
@@ -29,13 +29,10 @@ all:	Deadwood version.h
 #
 
 clean:
-	rm -f Test DwMain DwTcp *.exe *.o a.out RandomPrime writehash_test* \
-		Deadwood foo* dw_cache DwHash DwCompress *stackdump \
-		core ; \
-		./make.version.h ; if [ -e /dev/urandom ] ; \
-			then rm DwRandPrime.h  ; \
-			cc RandomPrime.c ; ./a.out > DwRandPrime.h ; rm a.out \
-		; fi 
+	rm -f Test DwMain DwTcp *.exe *.o a.out writehash_test* \
+		Deadwood foo* dw_cache DwHash DwCompress *stackdump core
+
+
 
 version.h:	
 	./make.version.h
@@ -67,11 +64,8 @@ DwSocket.o:	DwSocket.c DwStr.h DwSocket.h
 DwSys.o:	DwSys.c DwStr.h version.h
 	$(CC) $(FLAGS) -Wall -c -o DwSys.o DwSys.c
 
-RandomPrime:	RandomPrime.c
-	$(CC) -O3 -o RandomPrime RandomPrime.c
-
-DwRandPrime.h: RandomPrime
-	if [ -e /dev/urandom ] ; then ./RandomPrime > DwRandPrime.h ; fi
+DwRandPrime.h:
+	echo '#define MUL_CONSTANT 1238145941' > DwRandPrime.h
 
 DwHash.o:	DwHash.c DwStr.h DwRandPrime.h DwHash.h
 	$(CC) $(FLAGS) -Wall -c -o DwHash.o DwHash.c