Fix compat regress to work with non-GNU make.
diff --git a/openbsd-compat/regress/Makefile.in b/openbsd-compat/regress/Makefile.in
index dd8cdc4..65cd5aa 100644
--- a/openbsd-compat/regress/Makefile.in
+++ b/openbsd-compat/regress/Makefile.in
@@ -18,7 +18,7 @@
 
 all:	t-exec ${OTHERTESTS}
 
-%$(EXEEXT):	%.c $(LIBCOMPAT)
+.c:	$(LIBCOMPAT)
 	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $< $(LIBCOMPAT) $(LIBS)
 
 t-exec:	$(TESTPROGS)