diff --git a/configure/os/CONFIG.Common.RHEL9-x86_64 b/configure/os/CONFIG.Common.RHEL9-x86_64
new file mode 100644
index 000000000..5673dc729
--- /dev/null
+++ b/configure/os/CONFIG.Common.RHEL9-x86_64
@@ -0,0 +1,18 @@
+# Include definitions common to linux pentium targets
+include $(CONFIG)/os/CONFIG.Common.linux-x86_64
+
+TOOLSET_LOCATION = /opt/rh
+TOOLSET = gcc-toolset-12
+STD_CXXFLAGS = -std=c++20
+
+# Fix bug in gcc-toolset-11 calling the old assembler
+ifneq ($(filter %-11,$(TOOLSET)),)
+TARGET_CPPFLAGS += $(TOOLSET_DIR:%=-B$(SYSROOT)%/bin)
+TARGET_LDFLAGS  += $(TOOLSET_DIR:%=-B$(SYSROOT)%/bin)
+endif
+
+ifneq (($(TOOLSET)),)
+# Perl requests (native) annobin incompatible with the annobin from any TOOLSET
+# Disable Perl specific CFLAGS
+override Cap5_CFLAGS=
+endif
diff --git a/configure/os/CONFIG.Common.RHEL9-x86_64-clang b/configure/os/CONFIG.Common.RHEL9-x86_64-clang
new file mode 100644
index 000000000..b93ce65ff
--- /dev/null
+++ b/configure/os/CONFIG.Common.RHEL9-x86_64-clang
@@ -0,0 +1,3 @@
+include $(CONFIG)/os/CONFIG.Common.linux-clang
+
+STD_CXXFLAGS = -std=c++2a
diff --git a/configure/os/CONFIG.Linux.windows-x64 b/configure/os/CONFIG.Linux.windows-x64
index a03f930fe..f21e61176 100644
--- a/configure/os/CONFIG.Linux.windows-x64
+++ b/configure/os/CONFIG.Linux.windows-x64
@@ -3,5 +3,6 @@ include $(CONFIG)/os/CONFIG.windows-x64.windows-x64
 VALID_BUILDS = Ioc Command
 
 MSVC_VERSION ?= 2019
-PATH := /opt/wine-msvc-$(MSVC_VERSION)/bin/x64:$(PATH)
+PATH := /opt/gfa-wine/bin:/opt/wine-msvc-$(MSVC_VERSION)/bin/x64:$(PATH)
 export WINEPREFIX = $(HOME)/.wine-$(EPICS_HOST_ARCH)
+export WINE = wine64
diff --git a/configure/os/CONFIG.RHEL9-x86_64.Common b/configure/os/CONFIG.RHEL9-x86_64.Common
new file mode 100644
index 000000000..26c65b727
--- /dev/null
+++ b/configure/os/CONFIG.RHEL9-x86_64.Common
@@ -0,0 +1,3 @@
+#CONFIG.$(EPICS_HOST_ARCH).Common is required by build system
+#Include definitions common to linux hosts
+include $(CONFIG)/os/CONFIG.linux-x86_64.Common
diff --git a/configure/os/CONFIG.RHEL9-x86_64.RHEL7-x86_64 b/configure/os/CONFIG.RHEL9-x86_64.RHEL7-x86_64
new file mode 100644
index 000000000..47c5acfa0
--- /dev/null
+++ b/configure/os/CONFIG.RHEL9-x86_64.RHEL7-x86_64
@@ -0,0 +1,18 @@
+# Include common linux definitions
+include $(CONFIG)/os/CONFIG.linux-x86.linux-x86
+
+# "Cross compile" for RHEL7-x86_64
+# Expects RHEL7 RPMs c++ and readline-devel installed
+# in $(SYSROOT)
+# This can be installed on RHEL7 with:
+#    yum install --installroot=$(SYSROOT) <packages>
+# (Assuming $(SYSROOT) is on a shared network volume.)
+# Optionally use a newer TOOLSET (installed on $(SYSROOT)).
+
+SYSROOT = /opt/RHEL7
+
+# "Cross" TOOLSET progs need to find their libraries
+LD_LIBRARY_PATH = $(TOOLSET_DIR:%=$(SYSROOT)%/usr/$$LIB:)/usr/$$LIB:$(SYSROOT)/usr/$$LIB
+
+# The linker has problems to find indirectly referenced libraries
+PROD_LDLIBS += $(LDLIBS)
diff --git a/configure/os/CONFIG.RHEL9-x86_64.RHEL8-x86_64 b/configure/os/CONFIG.RHEL9-x86_64.RHEL8-x86_64
new file mode 100644
index 000000000..8fc6cec5b
--- /dev/null
+++ b/configure/os/CONFIG.RHEL9-x86_64.RHEL8-x86_64
@@ -0,0 +1,23 @@
+# Include common linux definitions
+include $(CONFIG)/os/CONFIG.linux-x86.linux-x86
+
+# "Cross compile" for RHEL8-x86_64
+# Expects RHEL8 RPMs gcc-toolset-12-gcc-c++ and readline-devel
+# to be installed in $(SYSROOT)
+# These can be installed on RHEL8 with:
+#    yum install --installroot=$(SYSROOT) <packages>
+# (Assuming $(SYSROOT) is on a shared network volume.)
+
+SYSROOT = /opt/RHEL8
+
+# "Cross" TOOLSET progs need to find their libraries.
+# But linker gets confused with LD_LIBRARY_PATH.
+# Thus only wrap the compiler.
+WRAPPER = -wrapper env,LD_LIBRARY_PATH=$(TOOLSET_DIR:%=$(SYSROOT)%/usr/lib64:)/usr/lib64:$(SYSROOT)/usr/lib64
+TARGET_CPPFLAGS += $(WRAPPER)
+TARGET_PROD_LDFLAGS += $(WRAPPER)
+
+# These programs as cross tools would also need LD_LIBRARY_PATH.
+# But but our host versions work just fine.
+AR = ar -rc
+RANLIB = ranlib
diff --git a/configure/os/CONFIG.RHEL9-x86_64.RHEL9-x86_64 b/configure/os/CONFIG.RHEL9-x86_64.RHEL9-x86_64
new file mode 100644
index 000000000..2bf7aace1
--- /dev/null
+++ b/configure/os/CONFIG.RHEL9-x86_64.RHEL9-x86_64
@@ -0,0 +1,2 @@
+# Include common linux definitions
+include $(CONFIG)/os/CONFIG.linux-x86.linux-x86
diff --git a/configure/os/CONFIG.RHEL9-x86_64.windows-x64 b/configure/os/CONFIG.RHEL9-x86_64.windows-x64
new file mode 100644
index 000000000..f79e7a452
--- /dev/null
+++ b/configure/os/CONFIG.RHEL9-x86_64.windows-x64
@@ -0,0 +1 @@
+include $(CONFIG)/os/CONFIG.Linux.windows-x64
diff --git a/configure/os/CONFIG_SITE.RHEL9-x86_64.Common b/configure/os/CONFIG_SITE.RHEL9-x86_64.Common
new file mode 100644
index 000000000..ad5296dfc
--- /dev/null
+++ b/configure/os/CONFIG_SITE.RHEL9-x86_64.Common
@@ -0,0 +1,10 @@
+include $(CONFIG)/os/CONFIG_SITE.linux-x86_64.Common
+
+# Improved error checking with clang
+CROSS_COMPILER_TARGET_ARCHS += RHEL9-x86_64-clang
+
+# Build for old RHEL8 64 bit
+CROSS_COMPILER_TARGET_ARCHS += RHEL8-x86_64
+
+# Build for old RHEL7 64 bit
+CROSS_COMPILER_TARGET_ARCHS += RHEL7-x86_64