diff --git a/Makefile.inc1 b/Makefile.inc1
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -138,9 +138,9 @@
 .endif
 .endif
 MACHINE_ABI?=	unknown
-MACHINE_TRIPLE?=${MACHINE_ARCH:S/amd64/x86_64/:C/sf$//}-${MACHINE_ABI}-freebsd14.0
+MACHINE_TRIPLE?=${MACHINE_ARCH:S/amd64/x86_64/:C/sf$//}-${MACHINE_ABI}-freebsd${OS_REVISION}
 TARGET_ABI?=	unknown
-TARGET_TRIPLE?=	${TARGET_ARCH:S/amd64/x86_64/:C/sf$//}-${TARGET_ABI}-freebsd14.0
+TARGET_TRIPLE?=	${TARGET_ARCH:S/amd64/x86_64/:C/sf$//}-${TARGET_ABI}-freebsd${OS_REVISION}
 KNOWN_ARCHES?=	aarch64/arm64 \
 		amd64 \
 		armv6/arm \
diff --git a/lib/clang/llvm.build.mk b/lib/clang/llvm.build.mk
--- a/lib/clang/llvm.build.mk
+++ b/lib/clang/llvm.build.mk
@@ -14,6 +14,10 @@
 .error Please define SRCDIR before including this file
 .endif
 
+.ifndef OS_REVISION
+.error Please define OS_REVISION before including this file
+.endif
+
 .PATH:		${LLVM_BASE}/${SRCDIR}
 
 CFLAGS+=	-I${SRCTOP}/lib/clang/include
@@ -40,10 +44,9 @@
 TARGET_ABI=
 .endif
 VENDOR=		unknown
-OS_VERSION=	freebsd14.0
 
-LLVM_TARGET_TRIPLE?=	${TARGET_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-${OS_VERSION}${TARGET_ABI}
-LLVM_BUILD_TRIPLE?=	${BUILD_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-${OS_VERSION}
+LLVM_TARGET_TRIPLE?=	${TARGET_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-freebsd${OS_REVISION}${TARGET_ABI}
+LLVM_BUILD_TRIPLE?=	${BUILD_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-freebsd${OS_REVISION}
 
 CFLAGS+=	-DLLVM_DEFAULT_TARGET_TRIPLE=\"${LLVM_TARGET_TRIPLE}\"
 CFLAGS+=	-DLLVM_HOST_TRIPLE=\"${LLVM_BUILD_TRIPLE}\"
diff --git a/share/mk/bsd.compat.mk b/share/mk/bsd.compat.mk
--- a/share/mk/bsd.compat.mk
+++ b/share/mk/bsd.compat.mk
@@ -30,7 +30,7 @@
 .endif
 .if ${COMPAT_COMPILER_TYPE} == gcc
 .else
-LIB32CPUFLAGS+=	-target x86_64-unknown-freebsd14.0
+LIB32CPUFLAGS+=	-target x86_64-unknown-freebsd${OS_REVISION}
 .endif
 LIB32CPUFLAGS+=	-m32
 LIB32_MACHINE=	i386
@@ -51,7 +51,7 @@
 .if ${COMPAT_COMPILER_TYPE} == "gcc"
 LIB32CPUFLAGS+=	-m32
 .else
-LIB32CPUFLAGS+=	-target powerpc-unknown-freebsd14.0
+LIB32CPUFLAGS+=	-target powerpc-unknown-freebsd${OS_REVISION}
 .endif
 
 LIB32_MACHINE=	powerpc
diff --git a/share/mk/src.sys.env.mk b/share/mk/src.sys.env.mk
--- a/share/mk/src.sys.env.mk
+++ b/share/mk/src.sys.env.mk
@@ -23,6 +23,11 @@
 RELOBJTOP?=	${RELTOP}
 RELSRCTOP?=	${RELTOP}
 
+.if !defined(OS_REVISION)
+OS_REVISION!=eval `sh ${SRCTOP}/sys/conf/newvers.sh -V REVISION` && echo $$REVISION || echo
+.export OS_REVISION
+.endif
+
 # site customizations that do not depend on anything!
 
 # Save MAKEOBJDIRPREFIX and don't let src-env.conf modify it.