diff --git a/configure/os/CONFIG.Common.linux-x86_64 b/configure/os/CONFIG.Common.linux-x86_64
new file mode 100644
index 000000000..daa4368d8
--- /dev/null
+++ b/configure/os/CONFIG.Common.linux-x86_64
@@ -0,0 +1,35 @@
+# CONFIG.Common.linux-x86_64
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86_64 target builds
+# Sites may override these definitions in CONFIG_SITE.Common.linux-x86_64
+#-------------------------------------------------------
+
+# Include definitions common to all linux targets
+include $(CONFIG)/os/CONFIG.Common.linuxCommon
+
+ARCH_CLASS = x86_64
+
+ARCH_DEP_CPPFLAGS += -D_X86_64_
+
+ifeq ($(BUILD_CLASS),CROSS)
+ifeq ($(EPICS_HOST_ARCH),linux-x86_64)
+   # Added for 386,486,... cross builds
+   CMPLR_PREFIX=
+   CROSS_INCLUDES=
+   CROSS_LDFLAGS=
+   # Use -w not -Wall
+   #WARN_CFLAGS_YES = -w
+   #WARN_CXXFLAGS_YES = -w
+-include $(CONFIG)/os/CONFIG_SITE.Common.linux-x86_64
+-include $(CONFIG)/os/CONFIG.linux-x86_64.linux-x86_64
+-include $(CONFIG)/os/CONFIG_SITE.linux-x86_64.linux-x86_64
+else
+   GNU_TARGET=i586-pc-linux-gnu
+   CMPLR_SUFFIX=
+   CMPLR_PREFIX=$(addsuffix -,$(GNU_TARGET))
+endif
+endif
+
diff --git a/configure/os/CONFIG.Common.linux-x86_64-debug b/configure/os/CONFIG.Common.linux-x86_64-debug
new file mode 100644
index 000000000..588c2fb3e
--- /dev/null
+++ b/configure/os/CONFIG.Common.linux-x86_64-debug
@@ -0,0 +1,12 @@
+# CONFIG.Common.linux-x86_64-debug
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86_64 with debug compiler flags
+# Sites may override these definitions in CONFIG_SITE.Common.linux-x86_64-debug
+#-------------------------------------------------------
+
+# Include definitions common to all linux-x86_64  target archs
+include $(CONFIG)/os/CONFIG.Common.linux-x86_64
+
diff --git a/configure/os/CONFIG.linux-x86_64-debug.Common b/configure/os/CONFIG.linux-x86_64-debug.Common
new file mode 100644
index 000000000..d2bdf30e4
--- /dev/null
+++ b/configure/os/CONFIG.linux-x86_64-debug.Common
@@ -0,0 +1,15 @@
+# CONFIG.linux-x86_64-debug.Common
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86_64 debug with debug compiler flags
+# Sites may override these definitions in CONFIG_SITE.linux-x86_64-debug.Common
+#-------------------------------------------------------
+
+#Include definitions common to linux-x86_64 hosts
+include $(CONFIG)/os/CONFIG.linux-x86_64.Common
+
+# Make all crosscompiler builds debug builds
+#CROSS_OPT=NO
+
diff --git a/configure/os/CONFIG.linux-x86_64-debug.linux-x86_64-debug b/configure/os/CONFIG.linux-x86_64-debug.linux-x86_64-debug
new file mode 100644
index 000000000..2fadd4ae7
--- /dev/null
+++ b/configure/os/CONFIG.linux-x86_64-debug.linux-x86_64-debug
@@ -0,0 +1,14 @@
+# CONFIG.linux-x86_64-debug.linux-x86_64-debug
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86_64 host - linux-x86_64 target build with debug compiler flags
+# Sites may override these definitions in CONFIG_SITE.linux-x86_64-debug.linux-x86_64-debug
+#-------------------------------------------------------
+
+include $(CONFIG)/os/CONFIG.linux-x86_64.linux-x86_64
+
+# Removes -O optimization and adds -g compile option
+HOST_OPT=NO
+
diff --git a/configure/os/CONFIG.linux-x86_64.Common b/configure/os/CONFIG.linux-x86_64.Common
new file mode 100644
index 000000000..2eb22e0f2
--- /dev/null
+++ b/configure/os/CONFIG.linux-x86_64.Common
@@ -0,0 +1,13 @@
+# CONFIG.linux-x86_64.Common
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86_64 host builds
+# Sites may override these definitions in CONFIG_SITE.linux-x86_64.Common
+#-------------------------------------------------------
+
+#Include definitions common to unix hosts
+include $(CONFIG)/os/CONFIG.UnixCommon.Common
+
+WIND_HOST_TYPE = x86_64-linux
diff --git a/configure/os/CONFIG.linux-x86_64.linux-x86_64 b/configure/os/CONFIG.linux-x86_64.linux-x86_64
new file mode 100644
index 000000000..72aaaa88c
--- /dev/null
+++ b/configure/os/CONFIG.linux-x86_64.linux-x86_64
@@ -0,0 +1,21 @@
+#  CONFIG.linux-x86_64.linux-x86_64
+#
+# $Id$
+#
+# Definitions for linux-x86_64 host - linux-x86_64 target builds
+# Sites may override these definitions in CONFIG_SITE.linux-x86_64.linux-x86_64
+#-------------------------------------------------------
+
+# Include common gnu compiler definitions
+include $(CONFIG)/CONFIG.gnuCommon
+
+GNU_DIR = /usr
+
+STATIC_LDFLAGS_YES= -Wl,-Bstatic
+STATIC_LDFLAGS_NO=
+STATIC_LDLIBS_YES= -Wl,-Bdynamic
+STATIC_LDLIBS_NO=
+
+SHRLIB_LDFLAGS +=  -shared -fPIC
+LOADABLE_SHRLIB_LDFLAGS = -shared -fPIC
+
diff --git a/configure/os/CONFIG.linux-x86_64.linux-x86_64-debug b/configure/os/CONFIG.linux-x86_64.linux-x86_64-debug
new file mode 100644
index 000000000..8ba371fc4
--- /dev/null
+++ b/configure/os/CONFIG.linux-x86_64.linux-x86_64-debug
@@ -0,0 +1,13 @@
+# CONFIG.linux-x86-debug.linux-x86-debug
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86 host - linux-x86-debug target build with debug compiler flags
+# Sites may override these definitions in CONFIG_SITE.linux-x86.linux-x86-debug
+#-------------------------------------------------------
+
+include $(CONFIG)/os/CONFIG.linux-x86-debug.linux-x86-debug
+
+BUILD_CLASS = HOST
+
diff --git a/configure/os/CONFIG_SITE.Common.linux-x86_64 b/configure/os/CONFIG_SITE.Common.linux-x86_64
new file mode 100644
index 000000000..4c1387910
--- /dev/null
+++ b/configure/os/CONFIG_SITE.Common.linux-x86_64
@@ -0,0 +1,23 @@
+# CONFIG_SITE.Common.linux-x86_64
+#
+# $Id$
+#
+# Site Specific definitions for linux-x86_64 target
+# Only the local epics system manager should modify this file
+
+# NOTE for SHARED_LIBRARIES: In most cases if this is set to YES the
+# shared libraries will be found automatically.  However if the .so
+# files are installed at a different path to their compile-time path
+# then in order to be found at runtime do one of these:
+# a) LD_LIBRARY_PATH must include the full absolute pathname to
+#    $(INSTALL_LOCATION)/lib/$(EPICS_HOST_ARCH) when invoking base
+#    executables.
+# b) Add the runtime path to SHRLIB_SEARCH_DIRS, which will add
+#    the named directory to the list contained in the executables.
+# c) Add the runtime path to /etc/ld.so.conf and run ldconfig
+#    to inform the system of the shared library location.
+
+# If readline is not installed comment the following line
+# to omit command-line editing and history support
+COMMANDLINE_LIBRARY = READLINE
+OP_SYS_CFLAGS += -g
diff --git a/configure/os/CONFIG_SITE.linux-x86_64-debug.linux-x86_64-debug b/configure/os/CONFIG_SITE.linux-x86_64-debug.linux-x86_64-debug
new file mode 100644
index 000000000..622d8da6d
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64-debug.linux-x86_64-debug
@@ -0,0 +1,15 @@
+# CONFIG_SITE.linux-x86_64-debug.linux-x86_64-debug
+#
+# $Id$
+#
+# Site specific override definitions for solaris-sparc host builds
+# Only the local epics system manager should modify this file
+
+
+
+#Prepares the object code to collect data for profiling with prof. 
+#PROFILE=YES
+
+#Compiles for profiling with the gprof profiler.
+#GPROF=YES
+
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.Common b/configure/os/CONFIG_SITE.linux-x86_64.Common
new file mode 100644
index 000000000..7beb16ec3
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64.Common
@@ -0,0 +1,12 @@
+# CONFIG_SITE.linux-x86_64.Common
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Site override definitions for linux-x86_64 host builds
+#-------------------------------------------------------
+
+#CROSS_COMPILER_TARGET_ARCHS = vxWorks-68040 solaris-sparc
+#CROSS_COMPILER_TARGET_ARCHS = vxWorks-68040
+#CROSS_COMPILER_TARGET_ARCHS = RTEMS-mvme2100
+
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64 b/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64
new file mode 100644
index 000000000..3b1bfe6bf
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64
@@ -0,0 +1,17 @@
+# CONFIG_SITE.linux-x86_64.linux-x86_64
+#
+# $Id$
+#
+# Site specific definitions for linux-x86_64 host - linux-x86_64 target builds
+#-------------------------------------------------------
+
+# -z defs causes problems for Linux
+#The -z defs option causes the linker to not ignore
+# unresolved references when building a shared library
+# Forces a fatal error if any undefined symbols remain 
+# at the end of the link
+# So we will override the definition of SHRLIB_LDFLAGS
+# in "CONFIG.linux-x86_64.linux-x86_64"
+
+SHRLIB_LDFLAGS= -shared
+
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-68040 b/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-68040
new file mode 100644
index 000000000..9357a472a
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-68040
@@ -0,0 +1,21 @@
+# CONFIG_SITE.linux-x86_64.vxWorks-68040
+#
+# $Id$
+#
+# Site specific definitions for linux-x86_64 host -  vxWorks-68040 target builds
+# Only the local epics system manager should modify this file
+#-------------------------------------------------------
+
+# JBA test override values
+#CMPLR_SUFFIX=
+#GNU_TARGET=m68k-wrs-vxworks
+#CMPLR_PREFIX=$(addsuffix -,$(GNU_TARGET))
+
+# ORNL SNS overrides for cross compilers
+#VX_DIR = /opt/tornado20/
+#VX_CONFIG_DIR_YES = $(VX_DIR)/target/config
+#VX_INCLUDE_YES = /usr/local/crossgcc/m68k/m68k-wrs-vxworks/sys-include
+#VX_GNU_YES = /usr/local/crossgcc/m68k/
+#VX_GNU_BIN_YES = $(VX_GNU)/bin
+#VX_GNU_LIB_YES = /usr/local/crossgcc/m68k/lib/gcc-lib/m68k-wrs-vxworks/2.95.2
+
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-ppc603 b/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-ppc603
new file mode 100644
index 000000000..e72288b56
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-ppc603
@@ -0,0 +1,17 @@
+# CONFIG_SITE.linux-x86_64.vxWorks-ppc603
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Site override definitions for linux-x86_64 host - vxWorks-ppc603 target builds
+#-------------------------------------------------------
+# This file contains overrides for Vx builds
+# ORNL SNS overrides for cross compilers
+
+# The custom cross compiler for VxWorks on Linux
+# has place in a directory structure like that of
+# the Solaris distribution.  So now the cross should
+# only need the following line.
+# cross-compiler from "Linux x86pc" host to a "ppc603" target
+VX_DIR_YES = /ade/vxWorks/t202/ppc
+
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-ppc603_long b/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-ppc603_long
new file mode 100644
index 000000000..0e699e75b
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64.vxWorks-ppc603_long
@@ -0,0 +1,17 @@
+# CONFIG_SITE.linux-x86_64.vxWorks-ppc603_long
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Site override definitions for linux-x86_64 host - vxWorks-ppc603 target builds
+#-------------------------------------------------------
+# This file contains overrides for Vx builds
+# ORNL SNS overrides for cross compilers
+
+# The custom cross compiler for VxWorks on Linux
+# has place in a directory structure like that of
+# the Solaris distribution.  So now the cross should
+# only need the following line.
+# cross-compiler from "Linux x86pc" host to a "ppc603" target
+VX_DIR_YES = /ade/vxWorks/t202/ppc
+
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.vxWorksCommon b/configure/os/CONFIG_SITE.linux-x86_64.vxWorksCommon
new file mode 100644
index 000000000..8468249d5
--- /dev/null
+++ b/configure/os/CONFIG_SITE.linux-x86_64.vxWorksCommon
@@ -0,0 +1,11 @@
+# CONFIG_SITE.linux-x86_64.vxWorksCommon
+#
+# $Id$
+# This file is maintained by the build community.
+#
+# Definitions for linux-x86_64 host - vxWorks target builds
+#-------------------------------------------------------
+ 
+# SNS override values
+WIND_HOST_TYPE = x86-linux_64
+