Index: Makefile.inc1
===================================================================
--- Makefile.inc1
+++ Makefile.inc1
@@ -676,7 +676,7 @@
 		MK_HTML=no NO_LINT=yes MK_MAN=no \
 		-DNO_PIC MK_PROFILE=no -DNO_SHARED \
 		-DNO_CPU_CFLAGS MK_WARNS=no MK_CTF=no \
-		MK_CLANG_EXTRAS=no MK_CLANG_FULL=no \
+		MK_CLANG_EXTRAS=no MK_CLANG_FORMAT=no MK_CLANG_FULL=no \
 		MK_LLDB=no MK_RETPOLINE=no MK_TESTS=no \
 		MK_INCLUDES=yes
 
@@ -697,7 +697,7 @@
 		SSP_CFLAGS= \
 		-DNO_LINT \
 		-DNO_CPU_CFLAGS MK_WARNS=no MK_CTF=no \
-		MK_CLANG_EXTRAS=no MK_CLANG_FULL=no \
+		MK_CLANG_EXTRAS=no MK_CLANG_FORMAT=no MK_CLANG_FULL=no \
 		MK_LLDB=no MK_RETPOLINE=no MK_TESTS=no
 
 # cross-tools stage
@@ -2577,6 +2577,7 @@
 	SSP_CFLAGS= \
 	MK_CASPER=no \
 	MK_CLANG_EXTRAS=no \
+	MK_CLANG_FORMAT=no \
 	MK_CLANG_FULL=no \
 	MK_CTF=no \
 	MK_DEBUG_FILES=no \
Index: lib/clang/libclang/Makefile
===================================================================
--- lib/clang/libclang/Makefile
+++ lib/clang/libclang/Makefile
@@ -22,7 +22,7 @@
 
 # Explanation of different SRCS variants below:
 # SRCS_MIN:	always required, even for bootstrap
-# SRCS_EXT:	required for MK_CLANG_EXTRAS
+# SRCS_EXT:	required for MK_CLANG_EXTRAS || MK_CLANG_FORMAT
 # SRCS_FUL:	required for MK_CLANG_FULL
 # SRCS_LDB:	required for MK_LLDB
 
@@ -686,7 +686,7 @@
 SRCS_MIN+=	Tooling/Tooling.cpp
 
 SRCS_ALL+=	${SRCS_MIN}
-.if ${MK_CLANG_EXTRAS} != "no"
+.if ${MK_CLANG_EXTRAS} != "no" || ${MK_CLANG_FORMAT} != "no"
 SRCS_ALL+=	${SRCS_EXT}
 .endif
 .if ${MK_CLANG_FULL} != "no"
Index: share/mk/src.opts.mk
===================================================================
--- share/mk/src.opts.mk
+++ share/mk/src.opts.mk
@@ -202,6 +202,7 @@
     BHYVE_SNAPSHOT \
     BSD_GREP \
     CLANG_EXTRAS \
+    CLANG_FORMAT \
     DTRACE_TESTS \
     EXPERIMENTAL \
     GNU_GREP_COMPAT \
@@ -482,6 +483,7 @@
 
 .if ${MK_CLANG} == "no"
 MK_CLANG_EXTRAS:= no
+MK_CLANG_FORMAT:= no
 MK_CLANG_FULL:= no
 MK_LLVM_COV:= no
 .endif
Index: targets/pseudo/bootstrap-tools/Makefile
===================================================================
--- targets/pseudo/bootstrap-tools/Makefile
+++ targets/pseudo/bootstrap-tools/Makefile
@@ -43,7 +43,7 @@
 		MK_HTML=no NO_LINT=yes MK_MAN=no \
 		-DNO_PIC MK_PROFILE=no -DNO_SHARED \
 		-DNO_CPU_CFLAGS MK_WARNS=no MK_CTF=no \
-		MK_CLANG_EXTRAS=no MK_CLANG_FULL=no \
+		MK_CLANG_EXTRAS=no MK_CLANG_FORMAT=no MK_CLANG_FULL=no \
 		MK_LLDB=no MK_TESTS=no \
 		MK_INCLUDES=yes
 
Index: targets/pseudo/clang/Makefile.depend
===================================================================
--- targets/pseudo/clang/Makefile.depend
+++ targets/pseudo/clang/Makefile.depend
@@ -42,7 +42,6 @@
 .if ${MK_CLANG_EXTRAS} == "yes"
 DIRDEPS+= \
 	usr.bin/clang/bugpoint \
-	usr.bin/clang/clang-format \
 	usr.bin/clang/llc \
 	usr.bin/clang/lli \
 	usr.bin/clang/llvm-ar \
@@ -71,6 +70,10 @@
 
 .endif
 
+.if ${MK_CLANG_EXTRAS} == "yes" || ${MK_CLANG_FORMAT} == "yes"
+DIRDEPS+=	usr.bin/clang/clang-format
+.endif
+
 .if ${MK_LLD} == "yes"
 DIRDEPS+=	usr.bin/clang/lld
 .endif
Index: tools/build/mk/OptionalObsoleteFiles.inc
===================================================================
--- tools/build/mk/OptionalObsoleteFiles.inc
+++ tools/build/mk/OptionalObsoleteFiles.inc
@@ -1481,7 +1481,6 @@
 
 .if ${MK_CLANG_EXTRAS} == no
 OLD_FILES+=usr/bin/bugpoint
-OLD_FILES+=usr/bin/clang-format
 OLD_FILES+=usr/bin/llc
 OLD_FILES+=usr/bin/lli
 OLD_FILES+=usr/bin/llvm-as
@@ -1517,6 +1516,10 @@
 OLD_FILES+=usr/share/man/man1/opt.1.gz
 .endif
 
+.if ${MK_CLANG_EXTRAS} == no && ${MK_CLANG_FORMAT} == no
+OLD_FILES+=usr/bin/clang-format
+.endif
+
 .if ${MK_CPP} == no
 OLD_FILES+=usr/bin/cpp
 OLD_FILES+=usr/share/man/man1/cpp.1.gz
Index: tools/build/options/WITH_CLANG_FORMAT
===================================================================
--- /dev/null
+++ tools/build/options/WITH_CLANG_FORMAT
@@ -0,0 +1,2 @@
+.\" $FreeBSD$
+Set to build clang-format.
Index: usr.bin/clang/Makefile
===================================================================
--- usr.bin/clang/Makefile
+++ usr.bin/clang/Makefile
@@ -18,7 +18,6 @@
 
 .if ${MK_CLANG_EXTRAS} != "no"
 SUBDIR+=	bugpoint
-SUBDIR+=	clang-format
 SUBDIR+=	llc
 SUBDIR+=	lli
 SUBDIR+=	llvm-as
@@ -42,6 +41,10 @@
 SUBDIR+=	opt
 .endif
 
+.if ${MK_CLANG_EXTRAS} != "no" || ${MK_CLANG_FORMAT} != "no"
+SUBDIR+=	clang-format
+.endif
+
 .if ${MK_LLD} != "no"
 SUBDIR+=	lld
 .endif