diff --git a/configure/os/CONFIG.Common.RHEL7-x86_64 b/configure/os/CONFIG.Common.RHEL7-x86_64
deleted file mode 100644
index 7960c4fa9..000000000
--- a/configure/os/CONFIG.Common.RHEL7-x86_64
+++ /dev/null
@@ -1,8 +0,0 @@
-# Include definitions common to linux pentium targets
-include $(CONFIG)/os/CONFIG.Common.linux-x86_64
-
-BUILD_CLASS = HOST
-
-TOOLSET_LOCATION = /opt/rh
-TOOLSET = devtoolset-12
-STD_CXXFLAGS = -std=c++20
diff --git a/configure/os/CONFIG.Common.RHEL7-x86_64-clang b/configure/os/CONFIG.Common.RHEL7-x86_64-clang
deleted file mode 100644
index 8653b569d..000000000
--- a/configure/os/CONFIG.Common.RHEL7-x86_64-clang
+++ /dev/null
@@ -1,3 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.linux-clang
-
-BUILD_CLASS = HOST
diff --git a/configure/os/CONFIG.Common.T2-ppc604 b/configure/os/CONFIG.Common.T2-ppc604
deleted file mode 100644
index 3f71a6d5f..000000000
--- a/configure/os/CONFIG.Common.T2-ppc604
+++ /dev/null
@@ -1,8 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc604_long
-VXWORKS_VERSION = 5.5.1
-WIND_BASE = /opt/VxWorks/Tornado2.2.1
-
-#there is a problem with our ccppc and optimization
-# -O0 works, -O and -O1 and higher are buggy
-OPT_CFLAGS_YES = -O0
-OPT_CXXFLAGS_YES = -O0
diff --git a/configure/os/CONFIG.Common.V62-ppc604 b/configure/os/CONFIG.Common.V62-ppc604
deleted file mode 100644
index cc789ca10..000000000
--- a/configure/os/CONFIG.Common.V62-ppc604
+++ /dev/null
@@ -1,2 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc604_long
-VXWORKS_VERSION = 6.2
diff --git a/configure/os/CONFIG.Common.V63-ppc603 b/configure/os/CONFIG.Common.V63-ppc603
deleted file mode 100644
index 910283dd2..000000000
--- a/configure/os/CONFIG.Common.V63-ppc603
+++ /dev/null
@@ -1,5 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc603_long
-VXWORKS_VERSION = 6.3
-
-# Buggy "uninitialized variable" warning produces many false positives
-ARCH_DEP_CXXFLAGS += -Wno-uninitialized
diff --git a/configure/os/CONFIG.Common.V63-ppc604 b/configure/os/CONFIG.Common.V63-ppc604
deleted file mode 100644
index 3315e8fe2..000000000
--- a/configure/os/CONFIG.Common.V63-ppc604
+++ /dev/null
@@ -1,5 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc604_long
-VXWORKS_VERSION = 6.3
-
-# Buggy "uninitialized variable" warning produces many false positives
-ARCH_DEP_CXXFLAGS += -Wno-uninitialized
diff --git a/configure/os/CONFIG.Common.V64-ppc604 b/configure/os/CONFIG.Common.V64-ppc604
deleted file mode 100644
index 684d3cbd9..000000000
--- a/configure/os/CONFIG.Common.V64-ppc604
+++ /dev/null
@@ -1,5 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc604_long
-VXWORKS_VERSION = 6.4
-
-# Buggy "uninitialized variable" warning produces many false positives
-ARCH_DEP_CXXFLAGS += -Wno-uninitialized
diff --git a/configure/os/CONFIG.Common.V66-ppc603 b/configure/os/CONFIG.Common.V66-ppc603
deleted file mode 100644
index 8bcdabf06..000000000
--- a/configure/os/CONFIG.Common.V66-ppc603
+++ /dev/null
@@ -1,2 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc603_long
-VXWORKS_VERSION = 6.6
diff --git a/configure/os/CONFIG.Common.V66-ppc604 b/configure/os/CONFIG.Common.V66-ppc604
deleted file mode 100644
index c450c7d71..000000000
--- a/configure/os/CONFIG.Common.V66-ppc604
+++ /dev/null
@@ -1,2 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc604_long
-VXWORKS_VERSION = 6.6
diff --git a/configure/os/CONFIG.Common.V67-ppc604 b/configure/os/CONFIG.Common.V67-ppc604
deleted file mode 100644
index 98c2b41c9..000000000
--- a/configure/os/CONFIG.Common.V67-ppc604
+++ /dev/null
@@ -1,8 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc604_long
-VXWORKS_VERSION = 6.7
-
-# needed when including memPartLib.h, e.g. through moduleLib.h or loadLib.h
-ARCH_DEP_CFLAGS += -D_VSB_CONFIG_FILE='<../lib/h/config/vsbConfig.h>'
-
-# compiler tries to access license server (even though no license isneeded)
-export LM_LICENSE_FILE=37000@lic-windriver.psi.ch
diff --git a/configure/os/CONFIG.Common.V69-ppc32 b/configure/os/CONFIG.Common.V69-ppc32
deleted file mode 100644
index a17c86c15..000000000
--- a/configure/os/CONFIG.Common.V69-ppc32
+++ /dev/null
@@ -1,3 +0,0 @@
-include $(CONFIG)/os/CONFIG.Common.vxWorks-ppc32
-VXWORKS_VERSION = 6.9
-#export LD_LIBRARY_PATH=$(LD_LIBRARY_PATH:%=%:)$(WIND_BASE)/lmapi-5.0/$(WIND_HOST_TYPE)/lib
diff --git a/configure/os/CONFIG.Common.eldk42-ppc4xxFP b/configure/os/CONFIG.Common.eldk42-ppc4xxFP
index 839ad3aa6..a6f320745 100644
--- a/configure/os/CONFIG.Common.eldk42-ppc4xxFP
+++ b/configure/os/CONFIG.Common.eldk42-ppc4xxFP
@@ -11,13 +11,6 @@ ELDK=/opt/eldk-4.2
 GNU_TARGET=ppc_4xxFP
 GNU_DIR=$(ELDK)/usr
 
-# This cross tool chain is installed in a somehow weired way
-# Without the following lines it does not work on RHEL7
-# but it worked on SL6
-ARCH_DEP_CXXFLAGS += -I $(ELDK)/$(GNU_TARGET)/usr/include/c++/4.2.2
-ARCH_DEP_CXXFLAGS += -I $(ELDK)/$(GNU_TARGET)/usr/include/c++/4.2.2/powerpc-linux
-ARCH_DEP_CXXFLAGS += -I $(ELDK)/$(GNU_TARGET)/usr/include/c++/4.2.2/backward
-
 ARCH_DEP_LDFLAGS += -Wl,-rpath-link,$(ELDK)/$(GNU_TARGET)/lib
 ARCH_DEP_LDFLAGS += -Wl,-rpath-link,$(ELDK)/$(GNU_TARGET)/usr/lib
 
diff --git a/configure/os/CONFIG.Common.fslqoriq20-e6500_64 b/configure/os/CONFIG.Common.fslqoriq20-e6500_64
deleted file mode 100644
index 2e23a3e99..000000000
--- a/configure/os/CONFIG.Common.fslqoriq20-e6500_64
+++ /dev/null
@@ -1,17 +0,0 @@
-# IOxOS IFC1211 with Freescale QorIQ 2.0 toolchain
-
-# Include definitions common to all Linux targets
-include $(CONFIG)/os/CONFIG.Common.linuxCommon
-
-ARCH_CLASS = ppc
-
-SDK = fslsdk
-SDK_DIR = /opt/fsl-qoriq/2.0
-SDK_HOST_ARCH = $(GNU_HOST_ARCH_64)-$(SDK)-$(GNU_HOST_OS)
-SDK_TARGET = ppc64e6500-fsl-linux
-GNU_TARGET = powerpc64-fsl-linux
-SYSROOT = $(SDK_DIR)/sysroots/$(SDK_TARGET)
-GNU_DIR = $(SDK_DIR)/sysroots/$(SDK_HOST_ARCH)/usr
-GNU_BIN = $(GNU_DIR)/bin/$(GNU_TARGET)
-
-ARCH_DEP_CFLAGS = -mcpu=e6500 -m64 -mhard-float
diff --git a/configure/os/CONFIG.Common.nilrt7-armv7a b/configure/os/CONFIG.Common.nilrt7-armv7a
index 11a005732..e35d1dbbf 100644
--- a/configure/os/CONFIG.Common.nilrt7-armv7a
+++ b/configure/os/CONFIG.Common.nilrt7-armv7a
@@ -9,10 +9,10 @@ ARCH_CLASS = arm
 GNU_TARGET = arm-linux-gnu
 
 SYSROOT = /opt/LabVIEW-RT-19.5.1/arm/sysroots/armv7a-vfp-neon-nilrt-linux-gnueabi
-GNU_BIN = /opt/RHEL7/bin
+GNU_DIR = /opt/RHEL7
 
 # Needed on RHEL9:
-export LD_LIBRARY_PATH := $(LD_LIBRARY_PATH:%=%:)/usr/$$LIB:/opt/RHEL7/$$LIB
+export LD_LIBRARY_PATH := $(LD_LIBRARY_PATH:%=%:)/usr/$$LIB:$(GNU_DIR)/$$LIB
 
 ARCH_DEP_CPPFLAGS += -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon
 ARCH_DEP_CXXFLAGS += -I=/usr/include/c++/4.7.2/arm-nilrt-linux-gnueabi
diff --git a/configure/os/CONFIG.Common.yocto21-aarch64 b/configure/os/CONFIG.Common.yocto21-aarch64
deleted file mode 100644
index 5220ed9bc..000000000
--- a/configure/os/CONFIG.Common.yocto21-aarch64
+++ /dev/null
@@ -1,15 +0,0 @@
-# XILINX Zynq with Yocto 2.1 / Petalinux toolchain
-
-# Include definitions common to all Linux targets
-include $(CONFIG)/os/CONFIG.Common.linuxCommon
-
-ARCH_CLASS = arm64
-
-SDK = petalinux
-SDK_DIR = /opt/petalinux-gfa/2018.1
-SDK_HOST_ARCH = $(GNU_HOST_ARCH_64)-$(SDK)-$(GNU_HOST_OS)
-SDK_TARGET = aarch64-xilinx-linux
-GNU_TARGET = $(SDK_TARGET)
-SYSROOT = $(SDK_DIR)/sysroots/$(SDK_TARGET)
-GNU_DIR = $(SDK_DIR)/sysroots/$(SDK_HOST_ARCH)/usr
-GNU_BIN = $(GNU_DIR)/bin/$(GNU_TARGET)
diff --git a/configure/os/CONFIG.RHEL7-x86_64.Common b/configure/os/CONFIG.RHEL7-x86_64.Common
deleted file mode 100644
index 26c65b727..000000000
--- a/configure/os/CONFIG.RHEL7-x86_64.Common
+++ /dev/null
@@ -1,3 +0,0 @@
-#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.RHEL7-x86_64.RHEL7-x86_64 b/configure/os/CONFIG.RHEL7-x86_64.RHEL7-x86_64
deleted file mode 100644
index 2bf7aace1..000000000
--- a/configure/os/CONFIG.RHEL7-x86_64.RHEL7-x86_64
+++ /dev/null
@@ -1,2 +0,0 @@
-# Include common linux definitions
-include $(CONFIG)/os/CONFIG.linux-x86.linux-x86
diff --git a/configure/os/CONFIG.RHEL7-x86_64.windows-x64 b/configure/os/CONFIG.RHEL7-x86_64.windows-x64
deleted file mode 100644
index 4774a65ac..000000000
--- a/configure/os/CONFIG.RHEL7-x86_64.windows-x64
+++ /dev/null
@@ -1,3 +0,0 @@
-# MSVC_VERSION 2019 in wine 4 for on RHEL7 would require winetricks
-MSVC_VERSION = 2017
-include $(CONFIG)/os/CONFIG.Linux.windows-x64
diff --git a/configure/os/CONFIG.RHEL8-x86_64.RHEL7-x86_64 b/configure/os/CONFIG.RHEL8-x86_64.RHEL7-x86_64
deleted file mode 100644
index 95ee5e5bd..000000000
--- a/configure/os/CONFIG.RHEL8-x86_64.RHEL7-x86_64
+++ /dev/null
@@ -1,28 +0,0 @@
-# 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
-export LD_LIBRARY_PATH := $(LD_LIBRARY_PATH:%=%:)$(TOOLSET_DIR:%=$(SYSROOT)%/usr/$$LIB)
-
-# The linker has problems to find indirectly referenced libraries
-ARCH_DEP_LDFLAGS+=-Wl,-rpath-link,$(INSTALL_LIB)
-
-# These programs have library problems when using them
-# from SYSROOT but without TOOLSET.
-# But provinding LD_LIBRARY PATH crashes other progams.
-# Our host versions work just fine.
-AR = ar -rc
-RANLIB = ranlib
-
-# Allow to run cross-tests which expect different lib versions
-export LD_PRELOAD=$(SYSROOT)/lib64/libreadline.so
diff --git a/configure/os/CONFIG.RHEL9-x86_64.RHEL7-x86_64 b/configure/os/CONFIG.RHEL9-x86_64.RHEL7-x86_64
deleted file mode 100644
index 3933e37fd..000000000
--- a/configure/os/CONFIG.RHEL9-x86_64.RHEL7-x86_64
+++ /dev/null
@@ -1,21 +0,0 @@
-# Include common linux definitions
-include $(CONFIG)/os/CONFIG.linux-x86.linux-x86
-
-# "Cross compile" for RHEL7-x86_64
-# Expects RHEL7 RPMs c++ and readline-devel installed
-# in $(SYSROOT)
-# This can be installed on RHEL7 with:
-#    yum install --installroot=$(SYSROOT) <packages>
-# (Assuming $(SYSROOT) is on a shared network volume.)
-# Optionally use a newer TOOLSET (installed on $(SYSROOT)).
-
-SYSROOT = /opt/RHEL7
-
-# "Cross" TOOLSET progs need to find their libraries
-export LD_LIBRARY_PATH := $(LD_LIBRARY_PATH:%=%:)$(TOOLSET_DIR:%=$(SYSROOT)%/usr/$$LIB:)/usr/$$LIB:$(SYSROOT)/usr/$$LIB
-
-# The linker has problems to find indirectly referenced libraries
-PROD_LDLIBS += $(LDLIBS)
-
-# Allow to run cross-tests which expect different lib versions
-export LD_PRELOAD=$(SYSROOT)/lib64/libreadline.so
diff --git a/configure/os/CONFIG_SITE.RHEL7-x86_64.Common b/configure/os/CONFIG_SITE.RHEL7-x86_64.Common
deleted file mode 100644
index 0c07a84e7..000000000
--- a/configure/os/CONFIG_SITE.RHEL7-x86_64.Common
+++ /dev/null
@@ -1,5 +0,0 @@
-include $(CONFIG)/os/CONFIG_SITE.linux-x86_64.Common
-
-# Improved error checking with clang
-CROSS_COMPILER_TARGET_ARCHS += RHEL7-x86_64-clang
-CROSS_COMPILER_RUNTEST_ARCHS += RHEL7-x86_64-clang
diff --git a/configure/os/CONFIG_SITE.RHEL8-x86_64.Common b/configure/os/CONFIG_SITE.RHEL8-x86_64.Common
index 638d48b1d..ecbfedf2c 100644
--- a/configure/os/CONFIG_SITE.RHEL8-x86_64.Common
+++ b/configure/os/CONFIG_SITE.RHEL8-x86_64.Common
@@ -3,7 +3,3 @@ include $(CONFIG)/os/CONFIG_SITE.linux-x86_64.Common
 # Improved error checking with clang
 CROSS_COMPILER_TARGET_ARCHS += RHEL8-x86_64-clang
 CROSS_COMPILER_RUNTEST_ARCHS += RHEL8-x86_64-clang
-
-# Build for old RHEL7 64 bit
-#CROSS_COMPILER_TARGET_ARCHS += RHEL7-x86_64
-#CROSS_COMPILER_RUNTEST_ARCHS += RHEL7-x86_64
diff --git a/configure/os/CONFIG_SITE.RHEL9-x86_64.Common b/configure/os/CONFIG_SITE.RHEL9-x86_64.Common
index e70b16936..d820656a2 100644
--- a/configure/os/CONFIG_SITE.RHEL9-x86_64.Common
+++ b/configure/os/CONFIG_SITE.RHEL9-x86_64.Common
@@ -7,7 +7,3 @@ CROSS_COMPILER_RUNTEST_ARCHS += RHEL9-x86_64-clang
 # Build for old RHEL8 64 bit
 CROSS_COMPILER_TARGET_ARCHS += RHEL8-x86_64
 CROSS_COMPILER_RUNTEST_ARCHS += RHEL8-x86_64
-
-# Build for even older RHEL7 64 bit
-#CROSS_COMPILER_TARGET_ARCHS += RHEL7-x86_64
-#CROSS_COMPILER_RUNTEST_ARCHS += RHEL7-x86_64
diff --git a/configure/os/CONFIG_SITE.linux-x86.Common b/configure/os/CONFIG_SITE.linux-x86.Common
index 7ffb448d5..859a4a575 100644
--- a/configure/os/CONFIG_SITE.linux-x86.Common
+++ b/configure/os/CONFIG_SITE.linux-x86.Common
@@ -12,13 +12,7 @@ GNU_HOST_ARCH=i686
 GNU_HOST_OS=linux
 
 # vxWorks for MVxxxx boards
-#CROSS_COMPILER_TARGET_ARCHS += T2-ppc604
-#CROSS_COMPILER_TARGET_ARCHS += V67-ppc604
 CROSS_COMPILER_TARGET_ARCHS += V69-ppc604
-#CROSS_COMPILER_TARGET_ARCHS += V69-ppc32
-
-# NI compact RIO
-#CROSS_COMPILER_TARGET_ARCHS += V63-ppc603
 
 # MOXA montavista linux (No PVA because of missing boost support)
 CROSS_COMPILER_TARGET_ARCHS += mvl40-xscale_be
@@ -36,14 +30,6 @@ CROSS_COMPILER_TARGET_ARCHS += eldk52-e500v2
 CROSS_COMPILER_TARGET_ARCHS += eldk42-ppc4xxFP
 CROSS_COMPILER_TARGET_ARCHS += eldk53-ppc4xxFP
 
-# Test other vxWorks versions
-#CROSS_COMPILER_TARGET_ARCHS += V66-ppc603
-#CROSS_COMPILER_TARGET_ARCHS += V66-ppc604
-#CROSS_COMPILER_TARGET_ARCHS += V63-ppc604
-#CROSS_COMPILER_TARGET_ARCHS += V64-ppc604
-# (No PVA because of old compiler)
-#CROSS_COMPILER_TARGET_ARCHS += V62-ppc604
-
 # RTEMS (Can only have 1 RTEMS major version in 1 EPICS installation
 # because they overwrite their header files.)
 #CROSS_COMPILER_TARGET_ARCHS += RTEMS49-pc386
diff --git a/configure/os/CONFIG_SITE.linux-x86.win32-x86-mingw b/configure/os/CONFIG_SITE.linux-x86.win32-x86-mingw
index 363664f26..20bc57197 100644
--- a/configure/os/CONFIG_SITE.linux-x86.win32-x86-mingw
+++ b/configure/os/CONFIG_SITE.linux-x86.win32-x86-mingw
@@ -14,7 +14,7 @@
 #GNU_DIR = /usr/local
 
 # Different distribution cross-build packages use different prefixes:
-# Ubuntu, RHEL7:
+# Ubuntu, RHEL:
 CMPLR_PREFIX = i686-w64-mingw32-
 # RHEL6:
 #CMPLR_PREFIX = i686-pc-mingw32-
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.Common b/configure/os/CONFIG_SITE.linux-x86_64.Common
index 8e10806a0..89c80479f 100644
--- a/configure/os/CONFIG_SITE.linux-x86_64.Common
+++ b/configure/os/CONFIG_SITE.linux-x86_64.Common
@@ -19,11 +19,7 @@ CROSS_COMPILER_RUNTEST_ARCHS += windows-x64
 CROSS_COMPILER_TARGET_ARCHS += windows-x64-mingw
 CROSS_COMPILER_RUNTEST_ARCHS += windows-x64-mingw
 
-# IOxOS IFC1211
-#CROSS_COMPILER_TARGET_ARCHS += fslqoriq20-e6500_64
-
 # Zynq
-#CROSS_COMPILER_TARGET_ARCHS += yocto21-aarch64
 CROSS_COMPILER_TARGET_ARCHS += yocto40-aarch64
 
 # Debian