diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -729,7 +729,7 @@
 	config -m ${KERNSRCDIR}/${TARGET}/conf/${kernel} 2> /dev/null | \
 	grep -v WARNING: | cut -f 2
 .if empty(TARGET_ARCH_${kernel})
-.error "Target architecture for ${TARGET}/conf/${kernel} unknown.  config(8) likely too old."
+.error Target architecture for ${TARGET}/conf/${kernel} unknown.  config(8) likely too old.
 .endif
 universe_kernconfs_${TARGET_ARCH_${kernel}}: universe_kernconf_${TARGET}_${kernel}
 universe_kernconf_${TARGET}_${kernel}: .MAKE
diff --git a/Makefile.inc1 b/Makefile.inc1
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -49,7 +49,7 @@
 #		obj depend all install clean cleandepend cleanobj
 
 .if !defined(TARGET) || !defined(TARGET_ARCH)
-.error "Both TARGET and TARGET_ARCH must be defined."
+.error Both TARGET and TARGET_ARCH must be defined.
 .endif
 
 .if make(showconfig) || make(test-system-*)
@@ -167,7 +167,7 @@
 .if ${.MAKE.OS} != "FreeBSD"
 CROSSBUILD_HOST=${.MAKE.OS}
 .if ${.MAKE.OS} != "Linux" && ${.MAKE.OS} != "Darwin"
-.warning "Unsupported crossbuild system: ${.MAKE.OS}. Build will probably fail!"
+.warning Unsupported crossbuild system: ${.MAKE.OS}. Build will probably fail!
 .endif
 # We need to force NO_ROOT/DB_FROM_SRC builds when building on other operating
 # systems since the BSD.foo.dist specs contain users and groups that do not
diff --git a/lib/Makefile b/lib/Makefile
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -187,7 +187,7 @@
     ${MACHINE_CPUARCH} == "powerpc")
 _libclang_rt=	libclang_rt
 .elif (${MK_ASAN} != "no" || ${MK_UBSAN} != "no") && make(all)
-.error "Requested build with sanitizers but cannot build runtime libraries!"
+.error Requested build with sanitizers but cannot build runtime libraries!
 .endif
 
 .if ${MK_CXX} != "no"
diff --git a/lib/libc/tests/net/getaddrinfo/Makefile b/lib/libc/tests/net/getaddrinfo/Makefile
--- a/lib/libc/tests/net/getaddrinfo/Makefile
+++ b/lib/libc/tests/net/getaddrinfo/Makefile
@@ -8,7 +8,7 @@
 
 BINDIR=		${TESTSDIR}
 
-.error "This testcase needs to be ported to FreeBSD (the output from getaddrinfo_test differs from NetBSD)"
+.error This testcase needs to be ported to FreeBSD (the output from getaddrinfo_test differs from NetBSD)
 
 NETBSD_ATF_TESTS_SH=	getaddrinfo_test
 
diff --git a/lib/libc/tests/ssp/Makefile b/lib/libc/tests/ssp/Makefile
--- a/lib/libc/tests/ssp/Makefile
+++ b/lib/libc/tests/ssp/Makefile
@@ -38,7 +38,7 @@
 LDADD.h_raw+=	${SANITIZER_LDFLAGS}
 .else
 .if make(all)
-.info "Could not find runtime library ${_libclang_rt_ubsan}, skipping h_raw"
+.info Could not find runtime library ${_libclang_rt_ubsan}, skipping h_raw
 .endif
 .endif
 .endif
diff --git a/share/zoneinfo/Makefile b/share/zoneinfo/Makefile
--- a/share/zoneinfo/Makefile
+++ b/share/zoneinfo/Makefile
@@ -39,7 +39,7 @@
 .PATH:		${CONTRIBDIR}
 
 .if defined(LEAPSECONDS)
-.warning "Using backwards compatibility variable for LEAPSECONDS; please use WITH_ZONEINFO_LEAPSECONDS_SUPPORT instead"
+.warning Using backwards compatibility variable for LEAPSECONDS; please use WITH_ZONEINFO_LEAPSECONDS_SUPPORT instead
 MK_ZONEINFO_LEAPSECONDS_SUPPORT= yes
 .endif
 
diff --git a/stand/i386/Makefile.inc b/stand/i386/Makefile.inc
--- a/stand/i386/Makefile.inc
+++ b/stand/i386/Makefile.inc
@@ -35,7 +35,7 @@
 
 .if defined(LOADER_FIREWIRE_SUPPORT)
 MK_LOADER_FIREWIRE=yes
-.warning "LOADER_FIREWIRE_SUPPORT deprecated, please move to WITH_LOADER_FIREWIRE"
+.warning LOADER_FIREWIRE_SUPPORT deprecated, please move to WITH_LOADER_FIREWIRE
 .endif
 
 .include "../Makefile.inc"
diff --git a/tools/build/Makefile b/tools/build/Makefile
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -34,7 +34,7 @@
 .endif
 HOST_INCLUDE_ROOT=${_MACOS_SDK_DIR}/usr/include
 .if !exists(${HOST_INCLUDE_ROOT}/stdio.h)
-.error "You must install the macOS SDK (try xcode-select --install)"
+.error You must install the macOS SDK (try xcode-select --install)
 .endif
 .else
 HOST_INCLUDE_ROOT=/usr/include
diff --git a/tools/build/mk/Makefile.boot b/tools/build/mk/Makefile.boot
--- a/tools/build/mk/Makefile.boot
+++ b/tools/build/mk/Makefile.boot
@@ -65,7 +65,7 @@
 # MacOS ships /usr/lib/libarchive.dylib but doesn't provide the headers
 CFLAGS+=	-idirafter ${SRCTOP}/contrib/libarchive/libarchive
 .else
-.error "Unsupported build OS: ${.MAKE.OS}"
+.error Unsupported build OS: ${.MAKE.OS}
 .endif
 .endif # ${.MAKE.OS} != "FreeBSD"
 
diff --git a/usr.bin/mandoc/Makefile b/usr.bin/mandoc/Makefile
--- a/usr.bin/mandoc/Makefile
+++ b/usr.bin/mandoc/Makefile
@@ -15,7 +15,7 @@
 	${BINDIR}/mandoc ${BINDIR}/makewhatis \
 	${BINDIR}/mandoc ${BINDIR}/apropos
 .elif defined(BOOTSTRAPPING)
-.error "MK_MAN_UTILS should be set to yes when bootstrapping"
+.error MK_MAN_UTILS should be set to yes when bootstrapping
 .endif
 
 LIBMAN_SRCS=	man.c \