diff --git a/lib/clang/llvm.build.mk b/lib/clang/llvm.build.mk
index 3a712cde1703..5aff7081fb76 100644
--- a/lib/clang/llvm.build.mk
+++ b/lib/clang/llvm.build.mk
@@ -1,126 +1,126 @@
 # $FreeBSD$
 
 .include <src.opts.mk>
 
 .ifndef LLVM_BASE
 .error Please define LLVM_BASE before including this file
 .endif
 
 .ifndef LLVM_SRCS
 .error Please define LLVM_SRCS before including this file
 .endif
 
 .ifndef SRCDIR
 .error Please define SRCDIR before including this file
 .endif
 
 .PATH:		${LLVM_BASE}/${SRCDIR}
 
 CFLAGS+=	-I${SRCTOP}/lib/clang/include
 CFLAGS+=	-I${LLVM_SRCS}/include
 CFLAGS+=	-D__STDC_CONSTANT_MACROS
 CFLAGS+=	-D__STDC_FORMAT_MACROS
 CFLAGS+=	-D__STDC_LIMIT_MACROS
 CFLAGS+=	-DHAVE_VCS_VERSION_INC
 .if ${MK_LLVM_ASSERTIONS} == "no"
 CFLAGS+=	-DNDEBUG
 .endif
 
 TARGET_ARCH?=	${MACHINE_ARCH}
 BUILD_ARCH?=	${MACHINE_ARCH}
 
 # Armv6 and armv7 uses hard float abi, unless the CPUTYPE has soft in it.
 # arm (for armv4 and armv5 CPUs) always uses the soft float ABI.
 # For all other targets, we stick with 'unknown'.
 .if ${TARGET_ARCH:Marmv[67]*} && (!defined(CPUTYPE) || ${CPUTYPE:M*soft*} == "")
 TARGET_ABI=	-gnueabihf
 .elif ${TARGET_ARCH:Marm*}
 TARGET_ABI=	-gnueabi
 .else
 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}
 
 CFLAGS+=	-DLLVM_DEFAULT_TARGET_TRIPLE=\"${LLVM_TARGET_TRIPLE}\"
 CFLAGS+=	-DLLVM_HOST_TRIPLE=\"${LLVM_BUILD_TRIPLE}\"
 CFLAGS+=	-DDEFAULT_SYSROOT=\"${TOOLS_PREFIX}\"
 
 .if ${MK_LLVM_TARGET_AARCH64} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_AARCH64
 . if ${MACHINE_CPUARCH} == "aarch64"
 LLVM_NATIVE_ARCH=	AArch64
 . endif
 .endif
 .if ${MK_LLVM_TARGET_ARM} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_ARM
 . if ${MACHINE_CPUARCH} == "arm"
 LLVM_NATIVE_ARCH=	ARM
 . endif
 .endif
 .if ${MK_LLVM_TARGET_BPF} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_BPF
 .endif
 .if ${MK_LLVM_TARGET_MIPS} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_MIPS
 . if ${MACHINE_CPUARCH} == "mips"
 LLVM_NATIVE_ARCH=	Mips
 . endif
 .endif
 .if ${MK_LLVM_TARGET_POWERPC} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_POWERPC
 . if ${MACHINE_CPUARCH} == "powerpc"
 LLVM_NATIVE_ARCH=	PowerPC
 . endif
 .endif
 .if ${MK_LLVM_TARGET_RISCV} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_RISCV
 . if ${MACHINE_CPUARCH} == "riscv"
 LLVM_NATIVE_ARCH=	RISCV
 . endif
 .endif
 .if ${MK_LLVM_TARGET_X86} != "no"
 CFLAGS+=	-DLLVM_TARGET_ENABLE_X86
 . if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
 LLVM_NATIVE_ARCH=	X86
 . endif
 .endif
 
 .ifdef LLVM_NATIVE_ARCH
 CFLAGS+=	-DLLVM_NATIVE_ASMPARSER=LLVMInitialize${LLVM_NATIVE_ARCH}AsmParser
 CFLAGS+=	-DLLVM_NATIVE_ASMPRINTER=LLVMInitialize${LLVM_NATIVE_ARCH}AsmPrinter
 CFLAGS+=	-DLLVM_NATIVE_DISASSEMBLER=LLVMInitialize${LLVM_NATIVE_ARCH}Disassembler
 CFLAGS+=	-DLLVM_NATIVE_TARGET=LLVMInitialize${LLVM_NATIVE_ARCH}Target
 CFLAGS+=	-DLLVM_NATIVE_TARGETINFO=LLVMInitialize${LLVM_NATIVE_ARCH}TargetInfo
 CFLAGS+=	-DLLVM_NATIVE_TARGETMC=LLVMInitialize${LLVM_NATIVE_ARCH}TargetMC
 .endif
 
 CFLAGS+=	-ffunction-sections
 CFLAGS+=	-fdata-sections
 .include "bsd.linker.mk"
 .if ${LINKER_TYPE} == "mac"
 LDFLAGS+=	-Wl,-dead_strip
 .else
 LDFLAGS+=	-Wl,--gc-sections
 .endif
 
 CXXSTD?=	c++14
 CXXFLAGS+=	-fno-exceptions
 CXXFLAGS+=	-fno-rtti
 .if ${.MAKE.OS} == "FreeBSD" || !defined(BOOTSTRAPPING)
+CXXFLAGS.clang+= -stdlib=libc++
+.else
 # Building on macOS/Linux needs the real sysctl() not the bootstrap tools stub.
 CFLAGS+=	-DBOOTSTRAPPING_WANT_NATIVE_SYSCTL
-.else
-CXXFLAGS.clang+= -stdlib=libc++
 .endif
 .if defined(BOOTSTRAPPING) && ${.MAKE.OS} == "Linux"
 LIBADD+=	dl
 .endif
 
 .if ${MACHINE_ARCH:Mmips64}
 STATIC_CFLAGS+= -mxgot
 STATIC_CXXFLAGS+= -mxgot
 .endif