Index: head/Mk/Scripts/do-users-groups.sh
===================================================================
--- head/Mk/Scripts/do-users-groups.sh
+++ head/Mk/Scripts/do-users-groups.sh
@@ -28,7 +28,7 @@
 rm -f "${dp_UG_INSTALL}" "${dp_UG_DEINSTALL}" || :
 
 # Before FreeBSD 10.2, PW did not have -R support.
-if [ "${dp_OPSYS}" = FreeBSD ] && [ "${dp_OSVERSION}" -ge 1002000 ]; then
+if [ "${dp_OPSYS}" = FreeBSD ] ; then
 	cat >> "${dp_UG_INSTALL}" <<-eot
 	if [ -n "\${PKG_ROOTDIR}" ] && [ "\${PKG_ROOTDIR}" != "/" ]; then
 	  PW="${dp_PW} -R \${PKG_ROOTDIR}"
Index: head/Mk/Uses/7z.mk
===================================================================
--- head/Mk/Uses/7z.mk
+++ head/Mk/Uses/7z.mk
@@ -23,11 +23,6 @@
 IGNORE=			USES=7z has invalid arguments: ${7z_ARGS:Np7zip:Npartial}
 .endif
 
-.if ! ${7z_ARGS:Mp7zip} && (${OPSYS} == FreeBSD && ${OSVERSION} < 1000009)
-# libarchive lacks 7zip reader, fallback to P7ZIP_CMD
-7z_ARGS+=		p7zip
-.endif
-
 .if ${7z_ARGS:Mp7zip}
 EXTRACT_DEPENDS+=	${P7ZIP_CMD}:archivers/p7zip
 .endif
Index: head/Mk/Uses/compiler.mk
===================================================================
--- head/Mk/Uses/compiler.mk
+++ head/Mk/Uses/compiler.mk
@@ -241,18 +241,12 @@
 USE_GCC=	yes
 CHOSEN_COMPILER_TYPE=	gcc
 .if ${COMPILER_FEATURES:Mlibc++}
-.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1001508
-LDFLAGS+=	-L${LOCALBASE}/lib/c++
-CXXFLAGS+=	-nostdinc++ -isystem ${LOCALBASE}/include/c++/v1
-BUILD_DEPENDS+=	${LOCALBASE}/lib/c++/libstdc++.so:devel/libc++
-.else
 CXXFLAGS+=	-nostdinc++ -isystem /usr/include/c++/v1
 LDFLAGS+=	-L${WRKDIR}
 
 _USES_configure+=	200:gcc-libc++-configure
 gcc-libc++-configure:
 	@${LN} -fs /usr/lib/libc++.so ${WRKDIR}/libstdc++.so
-.endif # OSVERSION < 1001508
 .endif
 .endif
 
Index: head/Mk/Uses/iconv.mk
===================================================================
--- head/Mk/Uses/iconv.mk
+++ head/Mk/Uses/iconv.mk
@@ -41,8 +41,8 @@
 ICONV_INCLUDE_PATH=	/usr/include
 ICONV_LIB_PATH=		/usr/lib/libc.so
 
-.if (${OPSYS} == FreeBSD && (${OSVERSION} < 1001514 \
- || (${OSVERSION} >= 1100000 && ${OSVERSION} < 1100069))) \
+.if (${OPSYS} == FreeBSD && \
+ (${OSVERSION} >= 1100000 && ${OSVERSION} < 1100069)) \
  || exists(${LOCALBASE}/include/iconv.h)
 BUILD_DEPENDS+=	libiconv>=1.14_9:converters/libiconv
 ICONV_INCLUDE_PATH=	${LOCALBASE}/include
Index: head/Mk/Uses/linux.mk
===================================================================
--- head/Mk/Uses/linux.mk
+++ head/Mk/Uses/linux.mk
@@ -40,9 +40,9 @@
 .if ${LINUX_DEFAULT:M*_64}
 LINUX_ARCH=		x86_64
 LINUX_ARCH32=		i386
-.if ${ARCH} != amd64 || ${OPSYS} != FreeBSD || ${OSVERSION} < 1002507 \
+.if ${ARCH} != amd64 || ${OPSYS} != FreeBSD \
  || ( ${OSVERSION} >= 1100000 && ${OSVERSION} < 1100105 )
-IGNORE=			Linux ${LINUX_DEFAULT} is only supported on FreeBSD/amd64 10.3 or higher
+IGNORE=			Linux ${LINUX_DEFAULT} is unsupported on pre-release versions of FreeBSD 11. Update to 11.0-RELEASE or higher.
 .endif
 .else
 LINUX_ARCH=		i386
Index: head/Mk/bsd.gecko.mk
===================================================================
--- head/Mk/bsd.gecko.mk
+++ head/Mk/bsd.gecko.mk
@@ -144,7 +144,7 @@
 .if ${OPSYS} != DragonFly # XXX xpcshell crash during install
 # use jemalloc 3.0.0 (4.0 for firefox 43+) API for stats/tuning
 MOZ_EXPORT+=	MOZ_JEMALLOC3=1 MOZ_JEMALLOC4=1
-.if ${OPSYS} != FreeBSD || ${OSVERSION} < 1000012 || ${MOZILLA_VER:R:R} >= 37
+.if ${OPSYS} != FreeBSD || ${MOZILLA_VER:R:R} >= 37
 . if ${MOZILLA_VER:R:R} >= 48
 MOZ_OPTIONS+=	--enable-jemalloc=4
 .else
Index: head/Mk/bsd.port.mk
===================================================================
--- head/Mk/bsd.port.mk
+++ head/Mk/bsd.port.mk
@@ -1633,9 +1633,7 @@
 # We prefer to pass MK_*=no but it was only supported after a certain
 # revision.  Passing WITHOUT_* may conflict with a make.conf or src.conf's
 # WITH_* value.  Note that ports *do* pull in src.conf.
-.if (${OSVERSION} >= 903510 && ${OSVERSION} < 1000000) || \
-    (${OSVERSION} >= 1003503 && ${OSVERSION} < 1100000) || \
-    ${OSVERSION} >= 1100000
+.if ${OSVERSION} >= 1003503
 # We will control debug files.  Don't let builds that use /usr/share/mk
 # split out debug symbols since the plist won't know to expect it.
 MAKE_ENV+=	MK_DEBUG_FILES=no
@@ -3150,7 +3148,7 @@
 .if !target(run-autotools-fixup)
 run-autotools-fixup:
 # Work around an issue where FreeBSD 10.0 is detected as FreeBSD 1.x.
-.if ${OSVERSION} >= 1000000 && !defined(WITHOUT_FBSD10_FIX)
+.if !defined(WITHOUT_FBSD10_FIX)
 	-@for f in `${FIND} ${WRKDIR} -type f \( -name config.libpath -o \
 		-name config.rpath -o -name configure -o -name libtool.m4 -o \
 		-name ltconfig -o -name libtool -o -name aclocal.m4 -o \
Index: head/Mk/bsd.ssp.mk
===================================================================
--- head/Mk/bsd.ssp.mk
+++ head/Mk/bsd.ssp.mk
@@ -3,19 +3,6 @@
 
 SSP_Include_MAINTAINER=	portmgr@FreeBSD.org
 
-# See: http://svnweb.freebsd.org/base/head/lib/libc/libc.ldscript?revision=251668&view=markup
-.if ${OSVERSION} < 1000036 && ${ARCH} == i386
-
-# Disabled on i386 for now on releases without the ldscript as too many ports
-# do not respect LDFLAGS and fail to build due to not adding in -lssp_nonshared when needed
-# despite dependencies working fine, which breaks a lot. Can enable once LDFLAGS is more
-# supported. XXX
-SSP_UNSAFE=		yes
-
-# i386 needs -lssp_nonshared, see svn link above for more information
-SSP_NEED_NONSHARED=	yes
-.endif
-
 .if !defined(SSP_UNSAFE) && \
     (${ARCH} == i386 || ${ARCH} == amd64)
 # Overridable as a user may want to use -fstack-protector-all