Index: head/share/mk/src.sys.env.mk
===================================================================
--- head/share/mk/src.sys.env.mk	(revision 356826)
+++ head/share/mk/src.sys.env.mk	(revision 356827)
@@ -1,88 +1,89 @@
 # $FreeBSD$
 
 # early setup only see also src.sys.mk
 
 # bmake-20170301 started taking '-C' "as is" for some cases, notably absolute
 # paths.  Some later comparisons will assume .CURDIR is resolved and matches
 # what we would get with 'cd'.  So just force resolve it now if it is an
 # absolute path.
 .if ${MAKE_VERSION} >= 20170301 && !empty(.CURDIR:M/*)
 .CURDIR:= ${.CURDIR:tA}
 .endif
 
 # make sure this is defined in a consistent manner
 SRCTOP:= ${.PARSEDIR:tA:H:H}
 
 .if ${.CURDIR} == ${SRCTOP}
 RELDIR= .
 RELTOP= .
 .elif ${.CURDIR:M${SRCTOP}/*}
 RELDIR:= ${.CURDIR:S,${SRCTOP}/,,}
 .endif
 RELTOP?= 	${RELDIR:C,[^/]+,..,g}
 RELOBJTOP?=	${RELTOP}
 RELSRCTOP?=	${RELTOP}
 
 # site customizations that do not depend on anything!
 
 # Save MAKEOBJDIRPREFIX and don't let src-env.conf modify it.
 # MAKEOBJDIRPREFIX is only needed in MAKELEVEL=0.  In sub-makes it will
 # either be read from environment or OBJDIR/MAKEOBJDIR according to
 # src.sys.obj.mk.
 .if !(${.MAKE.LEVEL} == 0 || empty(OBJROOT))
 .if defined(MAKEOBJDIRPREFIX)
 _saveMAKEOBJDIRPREFIX:=	${MAKEOBJDIRPREFIX}
 .else
 _undefMAKEOBJDIRPREFIX=	t
 .endif
 .endif
 
 SRC_ENV_CONF?= /etc/src-env.conf
 .if !empty(SRC_ENV_CONF) && !target(_src_env_conf_included_)
 .-include "${SRC_ENV_CONF}"
 _src_env_conf_included_:	.NOTMAIN
 .endif
 
 .if defined(_saveMAKEOBJDIRPREFIX) || defined(_undefMAKEOBJDIRPREFIX)
 .if defined(MAKEOBJDIRPREFIX) && ((defined(_saveMAKEOBJDIRPREFIX) && \
     ${_saveMAKEOBJDIRPREFIX} != ${MAKEOBJDIRPREFIX}) || \
     defined(_undefMAKEOBJDIRPREFIX))
 .warning ${SRC_ENV_CONF}: Ignoring MAKEOBJDIRPREFIX entry in sub-make.  Use '?=' to avoid this warning.
 .endif
 .if defined(_saveMAKEOBJDIRPREFIX)
 MAKEOBJDIRPREFIX:=	${_saveMAKEOBJDIRPREFIX}
 .undef _saveMAKEOBJDIRPREFIX
 .elif defined(_undefMAKEOBJDIRPREFIX)
 .undef MAKEOBJDIRPREFIX
 .undef _undefMAKEOBJDIRPREFIX
 .endif
 .endif
 
 .include <bsd.mkopt.mk>
 
 # Top-level installs should not use meta mode as it may prevent installing
-# based on cookies.
-.if make(*install*) && ${.MAKE.LEVEL} == 0
+# based on cookies. It's fine with filemon though.
+.if !empty(META_MODE:Mnofilemon) && \
+  make(*install*) && ${.MAKE.LEVEL} == 0
 META_MODE=	normal
 MK_META_MODE=	no
 .export MK_META_MODE
 .endif
 
 # If we were found via .../share/mk we need to replace that
 # with ${.PARSEDIR:tA} so that we can be found by
 # sub-makes launched from objdir.
 .if ${.MAKEFLAGS:M.../share/mk} != ""
 .MAKEFLAGS:= ${.MAKEFLAGS:S,.../share/mk,${.PARSEDIR:tA},}
 .endif
 .if ${MAKESYSPATH:Uno:M*.../*} != ""
 MAKESYSPATH:= ${MAKESYSPATH:S,.../share/mk,${.PARSEDIR:tA},}
 .export MAKESYSPATH
 .elif empty(MAKESYSPATH)
 MAKESYSPATH:=	${.PARSEDIR:tA}
 .export MAKESYSPATH
 .endif
 
 .if ${RELDIR:U} == "." && ${.MAKE.LEVEL} == 0
 .sinclude "${.CURDIR}/Makefile.sys.inc"
 .endif
 .include <src.sys.obj.mk>