diff -uNr ncbi.original/make/makedis.csh ncbi/make/makedis.csh
--- ncbi.original/make/makedis.csh	2004-02-03 15:37:57.000000000 -0500
+++ ncbi/make/makedis.csh	2004-02-05 11:31:16.000000000 -0500
@@ -149,6 +149,11 @@
 			set platform=linux
 		endif
 		breaksw
+# 5-Feb-2004 Joe Landman (landman@scalableinformatics.com)
+# patch for opteron support
+        case "x86_64":
+                set platform=linux-x86_64
+                breaksw
 	case "ppc":
 		set platform=ppclinux
 		breaksw
diff -uNr ncbi.original/platform/linux-x86_64.ncbi.mk ncbi/platform/linux-x86_64.ncbi.mk
--- ncbi.original/platform/linux-x86_64.ncbi.mk	1969-12-31 19:00:00.000000000 -0500
+++ ncbi/platform/linux-x86_64.ncbi.mk	2004-02-05 11:32:46.000000000 -0500
@@ -0,0 +1,53 @@
+#
+# 2/2/2004 Joe Landman:  Fixed x86_64 support
+#
+# $Id: linux-x86.ncbi.mk,v 1.31 2004/01/09 18:47:22 beloslyu Exp $
+#
+NCBI_DEFAULT_LCL = lnx
+NCBI_MAKE_SHELL = /bin/sh
+#warning, the flags -D__USE_FILE_OFFSET64 -D__USE_LARGEFILE64 will allow
+#you to work with large (>4Gb) files only if you have glibc version >= 2.1
+#NCBI_CC = gcc -pipe -D__USE_FILE_OFFSET64 -D__USE_LARGEFILE64
+#it appears the flags above do not work anymore with newer libc,
+#the new flags should work. Dima. 08/23/01
+NCBI_AR=ar
+NCBI_CC = gcc -pipe -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -m64
+NCBI_CFLAGS1 = -c  -static
+NCBI_LDFLAGS1 = -O3 -m64 -msse2 -static
+NCBI_OPTFLAG = -O3  -m64 -msse2 
+NCBI_BIN_MASTER = /home/coremake/ncbi/bin
+NCBI_BIN_COPY = /home/coremake/ncbi/bins
+NCBI_INCDIR = /home/coremake/ncbi/include
+NCBI_LIBDIR = /home/coremake/ncbi/lib
+NCBI_ALTLIB = /home/coremake/ncbi/altlib
+#will work only when you have Motif installed!
+NCBI_VIBFLAG = -I/usr/X11R6/include -L/usr/X11R6/lib64 -DWIN_MOTIF
+NCBI_VIBLIBS = -lXmu -lXm -lXt -lSM -lICE -lXext -lXp -lX11 -ldl -lpthread
+#warning! If you have only dynamic version of Motif or Lesstif
+#you should delete -Wl,-Bstatic sentence from the next line:
+NCBI_DISTVIBLIBS = -L/usr/X11R6/lib64 -Wl,-Bstatic -lXmu -lXm -lXt -lSM -lICE -lXext -lXp -lX11 -ldl -lpthread
+NCBI_OTHERLIBS = -lm
+NCBI_RANLIB = ranlib
+# Used by makedis.csh
+NCBI_MT_OTHERLIBS = -lpthread
+NCBI_OTHERLIBS_MT = $(NCBI_MT_OTHERLIBS) -lm
+NCBI_THREAD_OBJ = ncbithr.o
+NETENTREZVERSION = 2.02c2ASN1SPEC6 
+
+# uncomment OPENGL_TARGETS to build OpenGL apps; do not change
+# OPENGL_NCBI_LIBS! However, may need to set
+# OPENGL_INCLUDE and OPENGL_LIBS to suit local environment
+# OPENGL_TARGETS = Cn3D
+OPENGL_NCBI_LIBS = LIB400=libvibrantOGL.a LIB3000=libncbicn3dOGL.a
+OPENGL_INCLUDE = -I/usr/X11R6/include
+OPENGL_LIBS = -L/usr/X11R6/lib64 -lGL -lGLU
+NCBI_OGLLIBS = -L/usr/X11R6/lib64 -lGL -lGLU
+
+# uncomment (and change appropriately) these lines to build PNG
+# output support into Cn3D (OpenGL version only)
+#LIBPNG_DIR = /home/paul/Programs/libpng
+#ZLIB_DIR = /home/paul/Programs/zlib
+
+NCBI_LBSM_SRC = ncbi_lbsmd_stub.c
+NCBI_LBSM_OBJ = ncbi_lbsmd_stub.o
+