diff --git a/src/Make.conf b/src/Make.conf
new file mode 100644
index 00000000000..e6d8628aea5
--- /dev/null
+++ b/src/Make.conf
@@ -0,0 +1,10 @@
+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+CC=cc64
+LD=cc64
+CFLAGS=-ggdb -I$(GOROOT)/include
+BIN=$(HOME)/bin
+O=o
+YFLAGS=-d
diff --git a/src/cmd/6a/Makefile b/src/cmd/6a/Makefile
index 4d987c12474..be34e99d368 100644
--- a/src/cmd/6a/Makefile
+++ b/src/cmd/6a/Makefile
@@ -2,10 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-YFLAGS=-d
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 TARG=\
 	6a\
@@ -26,7 +23,7 @@ YFILES=\
 	a.y\
 
 $(TARG): $(OFILES)
-	cc -o $(TARG) -L$(GOROOT)/lib $(OFILES) -lbio -l9
+	$(LD) -o $(TARG) -L$(GOROOT)/lib $(OFILES) -lbio -l9
 
 $(OFILES): $(HFILES)
 
diff --git a/src/cmd/6c/Makefile b/src/cmd/6c/Makefile
index df92cee014e..fcfeb220434 100644
--- a/src/cmd/6c/Makefile
+++ b/src/cmd/6c/Makefile
@@ -2,9 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 TARG=\
 	6c\
@@ -32,7 +30,7 @@ LIB=\
 	../cc/cc.a$O
 
 $(TARG): $(OFILES) $(LIB)
-	cc -o $(TARG) -L$(GOROOT)/lib $(OFILES) $(LIB) -lbio -l9
+	$(LD) -o $(TARG) -L$(GOROOT)/lib $(OFILES) $(LIB) -lbio -l9
 
 $(OFILES): $(HFILES)
 
diff --git a/src/cmd/6g/Makefile b/src/cmd/6g/Makefile
index d119820e9e1..4d27ae811d6 100644
--- a/src/cmd/6g/Makefile
+++ b/src/cmd/6g/Makefile
@@ -2,9 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 TARG=\
 	6g
@@ -27,7 +25,7 @@ LIB=\
 	../gc/gc.a$O
 
 $(TARG): $(OFILES) $(LIB)
-	cc -o $(TARG) -L$(GOROOT)/lib $(OFILES) $(LIB) -lbio -l9
+	$(LD) -o $(TARG) -L$(GOROOT)/lib $(OFILES) $(LIB) -lbio -l9
 
 $(OFILES): $(HFILES)
 
diff --git a/src/cmd/6l/Makefile b/src/cmd/6l/Makefile
index e87efafc93e..c15f4ff1bda 100644
--- a/src/cmd/6l/Makefile
+++ b/src/cmd/6l/Makefile
@@ -2,9 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 TARG=\
 	6l\
@@ -25,7 +23,7 @@ HFILES=\
 
 
 $(TARG): $(OFILES)
-	cc -o $(TARG) -L$(GOROOT)/lib $(OFILES) -lbio -l9
+	$(LD) -o $(TARG) -L$(GOROOT)/lib $(OFILES) -lbio -l9
 
 $(OFILES): $(HFILES)
 
diff --git a/src/cmd/ar/Makefile b/src/cmd/ar/Makefile
index 11f573e1079..ec499b29709 100644
--- a/src/cmd/ar/Makefile
+++ b/src/cmd/ar/Makefile
@@ -2,9 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 # The directory is ar because the source is portable and general.
 # We call the binary 6ar to avoid confusion and because this binary
@@ -15,7 +13,7 @@ OFILES=\
 	ar.$O\
 
 $(TARG): $(OFILES)
-	cc -o $(TARG) -L$(GOROOT)/lib $(OFILES) -lmach_amd64 -lbio -l9
+	$(LD) -o $(TARG) -L$(GOROOT)/lib $(OFILES) -lmach_amd64 -lbio -l9
 
 clean:
 	rm -f $(OFILES) $(TARG)
diff --git a/src/cmd/cc/Makefile b/src/cmd/cc/Makefile
index cf52c8818a6..5d21241c430 100644
--- a/src/cmd/cc/Makefile
+++ b/src/cmd/cc/Makefile
@@ -2,10 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-YFLAGS=-d
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 LIB=\
 	cc.a$O\
diff --git a/src/cmd/gc/Makefile b/src/cmd/gc/Makefile
index 8535c64b437..d5db24fe2f1 100644
--- a/src/cmd/gc/Makefile
+++ b/src/cmd/gc/Makefile
@@ -2,10 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-YFLAGS=-d
-CFLAGS=-I$(GOROOT)/include
-BIN=$(HOME)/bin
-O=o
+include ../../Make.conf
 
 LIB=\
 	gc.a$O\
diff --git a/src/libbio/Makefile b/src/libbio/Makefile
index eddeac071df..02eaaa684f0 100644
--- a/src/libbio/Makefile
+++ b/src/libbio/Makefile
@@ -22,8 +22,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-CFLAGS=-I$(GOROOT)/include
-O=o
+include ../Make.conf
 
 LIB=libbio.a
 
diff --git a/src/libmach_amd64/Makefile b/src/libmach_amd64/Makefile
index b8aa716b38b..e4a80d8d29d 100644
--- a/src/libmach_amd64/Makefile
+++ b/src/libmach_amd64/Makefile
@@ -26,8 +26,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-CFLAGS=-I$(GOROOT)/include
-O=o
+include ../Make.conf
 
 LIB=libmach_amd64.a
 OFILES=\