--- a/Makefile.in
+++ b/Makefile.in
@@ -126,13 +126,13 @@ SCHEME = scheme/command-line.scm \
 	 rx/regress.scm
 
 go: c/scsh-tramp.c
-	$(CC) -o $@ $(CFLAGS) \
+	$(CC) -o $@ $(CFLAGS) $(CPPLAGS) $(LDFLAGS) \
 	-DVM=\"$(SCHEME48VM)\" \
 	-DIMAGE=\"scsh.image\" \
 	$(srcdir)/c/scsh-tramp.c
 
 scsh: c/scsh-tramp.c
-	$(CC) -o $@ $(CFLAGS) \
+	$(CC) -o $@ $(CFLAGS) $(CPPLAGS) $(LDFLAGS) \
 	-DVM=\"$(SCHEME48VM)\" \
 	-DIMAGE=\"$(LIB)/scsh.image\" \
 	$(srcdir)/c/scsh-tramp.c