From: Ruben Undheim <ruben.undheim@gmail.com>
Subject: Don't build abc when building yosys.
  It is built as a separate source package.

Forwarded: doesn't make sense upstream
Index: yosys/Makefile
===================================================================
--- yosys.orig/Makefile
+++ yosys/Makefile
@@ -204,7 +204,7 @@ endif
 
 ifeq ($(ENABLE_ABC),1)
 CXXFLAGS += -DYOSYS_ENABLE_ABC
-TARGETS += yosys-abc$(EXE)
+#TARGETS += yosys-abc$(EXE)
 endif
 
 ifeq ($(ENABLE_VERIFIC),1)