diff --git a/config/always-compiler-options.m4 b/config/always-compiler-options.m4
index 6383b12506ee..d2689ee56ae8 100644
--- a/config/always-compiler-options.m4
+++ b/config/always-compiler-options.m4
@@ -355,3 +355,23 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_KERNEL_CC_NO_IPA_SRA], [
 	CFLAGS="$saved_flags"
 	AC_SUBST([KERNEL_NO_IPA_SRA])
 ])
+
+dnl # Check if cc supports -finline-hint-functions
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_INLINE_HINT_FUNCTIONS], [
+	AC_MSG_CHECKING([whether $CC supports -finline-hint-functions])
+
+	saved_flags="$CFLAGS"
+	CFLAGS="$CFLAGS -Werror -finline-hint-functions"
+
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
+		INLINE_HINT_FUNCTIONS=-finline-hint-functions
+		AC_MSG_RESULT([yes])
+	], [
+		INLINE_HINT_FUNCTIONS=
+		AC_MSG_RESULT([no])
+	])
+
+	CFLAGS="$saved_flags"
+	AC_SUBST([INLINE_HINT_FUNCTIONS])
+])
diff --git a/config/always-system.m4 b/config/always-system.m4
index 3a3d4212f8b0..4bda7831e23d 100644
--- a/config/always-system.m4
+++ b/config/always-system.m4
@@ -16,6 +16,12 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_SYSTEM], [
 			ac_system="FreeBSD"
 			ac_system_l="freebsd"
 			;;
+		*darwin*)
+			AC_DEFINE([SYSTEM_MACOS], [1],
+				[True if ZFS is to be compiled for a macOS system])
+			ac_system="macOS"
+			ac_system_l="macos"
+			;;
 		*)
 			ac_system="unknown"
 			ac_system_l="unknown"
@@ -27,4 +33,5 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_SYSTEM], [
 
 	AM_CONDITIONAL([BUILD_LINUX], [test "x$ac_system" = "xLinux"])
 	AM_CONDITIONAL([BUILD_FREEBSD], [test "x$ac_system" = "xFreeBSD"])
+	AM_CONDITIONAL([BUILD_MACOS], [test "x$ac_system" = "xmacOS"])
 ])
diff --git a/config/kernel-macos-headers.m4 b/config/kernel-macos-headers.m4
new file mode 100644
index 000000000000..0adbb9ba7133
--- /dev/null
+++ b/config/kernel-macos-headers.m4
@@ -0,0 +1,103 @@
+dnl #
+dnl # macOS - attempt to find kernel headers. This is expected to
+dnl # only run on mac platforms (using xcrun command) to iterate 
+dnl # through versions of xcode, and xnu kernel source locations
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_MACOS_HEADERS], [
+	AM_COND_IF([BUILD_MACOS], [
+		AC_MSG_CHECKING([macOS kernel source directory])
+		AS_IF([test -z "$kernelsrc"], [
+			system_major_version=`sw_vers -productVersion | $AWK -F '.' '{ print $[]1 "." $[]2 }'`
+			AS_IF([test -d "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX${system_major_version}.sdk/System/Library/Frameworks/Kernel.framework/Headers"], [
+				kernelsrc="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX${system_major_version}.sdk/System/Library/Frameworks/Kernel.framework"])
+		])
+		AS_IF([test -z "$kernelsrc"], [
+			AS_IF([test -d "/System/Library/Frameworks/Kernel.framework/Headers"], [
+				kernelsrc="/System/Library/Frameworks/Kernel.framework"])
+		])
+		AS_IF([test -z "$kernelsrc"], [
+			tmpdir=`xcrun --show-sdk-path`
+			AS_IF([test -d "$tmpdir/System/Library/Frameworks/Kernel.framework/Headers"], [
+				kernelsrc="$tmpdir/System/Library/Frameworks/Kernel.framework"])
+		])
+		AS_IF([test -z "$kernelsrc"], [
+			AS_IF([test -d "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/Kernel.framework"], [
+				kernelsrc="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/Kernel.framework"])
+		])
+		AS_IF([test -z "$kernelsrc"], [
+			AS_IF([test -d "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/Kernel.framework"], [
+				kernelsrc="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/Kernel.framework"])
+		])
+		AS_IF([test -z "$kernelsrc"], [
+			AS_IF([test -d "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Kernel.framework"], [
+				kernelsrc="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Kernel.framework"])
+		])
+
+		AC_MSG_RESULT([$kernelsrc])
+
+		AC_MSG_CHECKING([macOS kernel build directory])
+		AS_IF([test -z "$kernelbuild"], [
+				kernelbuild=${kernelsrc}
+			])
+		])
+		AC_MSG_RESULT([$kernelbuild])
+
+       AC_ARG_WITH([kernel-modprefix],
+                AS_HELP_STRING([--with-kernel-modprefix=PATH],
+                [Path to kernel module prefix]),
+                [KERNEL_MODPREFIX="$withval"])
+        AC_MSG_CHECKING([macOS kernel module prefix])
+        AS_IF([test -z "$KERNEL_MODPREFIX"], [
+                KERNEL_MODPREFIX="/Library/Extensions"
+        ])
+        AC_MSG_RESULT([$KERNEL_MODPREFIX])
+        AC_DEFINE_UNQUOTED([KERNEL_MODPREFIX],
+                ["$KERNEL_MODPREFIX"],
+                [Path where the kernel module is installed.]
+        )
+
+		AC_MSG_CHECKING([macOS kernel source version])
+		utsrelease1=$kernelbuild/Headers/libkern/version.h
+		AS_IF([test -r $utsrelease1 && fgrep -q OSRELEASE $utsrelease1], [
+			kernverfile=libkern/version.h ])
+
+		AS_IF([test "$kernverfile"], [
+			kernsrcver=`(echo "#include <$kernverfile>";
+				echo "kernsrcver=OSRELEASE") |
+				cpp -I$kernelbuild/Headers |
+				grep "^kernsrcver=" | cut -d \" -f 2`
+
+			AS_IF([test -z "$kernsrcver"], [
+				AC_MSG_RESULT([Not found])
+				AC_MSG_ERROR([*** Cannot determine kernel version.])
+			])
+		AC_MSG_RESULT([$kernsrcver])
+		])
+
+		AC_MSG_CHECKING([mach_kernel])
+		AS_IF([test -z "$machkernel"], [
+			AS_IF([test -e "/System/Library/Kernels/kernel"], [
+				machkernel="/System/Library/Kernels/kernel" ] )
+			AS_IF([test -e "/mach_kernel"], [
+				machkernel="/mach_kernel" ] )
+			AS_IF([test ! -f "$machkernel"], [
+				AC_MSG_ERROR([
+        *** mach_kernel file not found. For 10.9 and prior, this should be
+        *** '/mach_kernel' and for 10.10 and following, this should be
+        *** '/System/Library/Kernels/kernel'])
+			])
+		])
+		AC_MSG_RESULT($machkernel)
+
+
+dnl More Generic names:
+	MACH_KERNEL=${machkernel}
+	KERNEL_HEADERS=${kernelsrc}
+	KERNEL_VERSION=${kernsrcver}
+	AC_SUBST(KERNEL_HEADERS)
+	AC_SUBST(KERNEL_MODPREFIX)
+	AC_SUBST(KERNEL_VERSION)
+	AC_SUBST(MACH_KERNEL)
+	])
+])
+
diff --git a/config/kernel.m4 b/config/kernel.m4
index d25b65994f6f..2a2ab75cefb8 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -28,6 +28,10 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 
 		AC_SUBST(KERNEL_MAKE)
 	])
+	AM_COND_IF([BUILD_MACOS], [
+		ZFS_AC_KERNEL_SRC_MACOS_HEADERS
+		ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN
+	])
 ])
 
 dnl #
@@ -380,6 +384,7 @@ dnl #     and `/usr/src/linux-*` with the highest version number according
 dnl #     to `sort -V` is assumed to be both source and build directory.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL], [
+
 	AC_ARG_WITH([linux],
 		AS_HELP_STRING([--with-linux=PATH],
 		[Path to kernel source]),
@@ -390,6 +395,15 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 		[Path to kernel build objects]),
 		[kernelbuild="$withval"])
 
+	AC_ARG_WITH([macos],
+		AS_HELP_STRING([--with-macos=PATH],
+		[Path to macOS source]),
+		[kernelsrc="$withval/sys"])
+	AC_ARG_WITH(macos-obj,
+		AS_HELP_STRING([--with-macos-obj=PATH],
+		[Path to macOS build objects]),
+		[kernelbuild="$withval/$kernelsrc"])
+
 	AC_MSG_CHECKING([kernel source and build directories])
 	AS_IF([test -n "$kernelsrc" && test -z "$kernelbuild"], [
 		kernelbuild="$kernelsrc"
@@ -453,7 +467,8 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 	*** Please make sure the kernel devel package for your distribution
 	*** is installed and then try again.  If that fails, you can specify the
 	*** location of the kernel source and build with the '--with-linux=PATH' and
-	*** '--with-linux-obj=PATH' options respectively.])
+	*** '--with-linux-obj=PATH' options respectively.
+	*** If you are configuring for macOS, use '--with-macos=PATH'.])
 	])
 
 	AC_MSG_CHECKING([kernel source version])
@@ -604,9 +619,9 @@ dnl # ZFS_LINUX_CONFTEST_H
 dnl #
 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
 test -d build/$2 || mkdir -p build/$2
-cat - <<_ACEOF >build/$2/$2.h
+cat - <<_ACEOF1 >build/$2/$2.h
 $1
-_ACEOF
+_ACEOF1
 ])
 
 dnl #
@@ -614,9 +629,9 @@ dnl # ZFS_LINUX_CONFTEST_C
 dnl #
 AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
 test -d build/$2 || mkdir -p build/$2
-cat confdefs.h - <<_ACEOF >build/$2/$2.c
+cat confdefs.h - <<_ACEOF2 >build/$2/$2.c
 $1
-_ACEOF
+_ACEOF2
 ])
 
 dnl #
@@ -633,12 +648,12 @@ AC_DEFUN([ZFS_LINUX_CONFTEST_MAKEFILE], [
 	file=build/$1/Makefile
 
 	dnl # Example command line to manually build source.
-	cat - <<_ACEOF >$file
+	cat - <<_ACEOF3 >$file
 # Example command line to manually build source
 # make modules -C $LINUX_OBJ $ARCH_UM M=$PWD/build/$1
 
 ccflags-y := -Werror $FRAME_LARGER_THAN
-_ACEOF
+_ACEOF3
 
 	dnl # Additional custom CFLAGS as requested.
 	m4_ifval($3, [echo "ccflags-y += $3" >>$file], [])
diff --git a/config/macos.m4 b/config/macos.m4
new file mode 100644
index 000000000000..30e8ebf2ec46
--- /dev/null
+++ b/config/macos.m4
@@ -0,0 +1,11 @@
+
+
+AC_DEFUN([ZFS_AC_MACOS_IMPURE_ENABLE], [
+	AC_ARG_ENABLE(macos_impure,
+		AS_HELP_STRING([--enable-macos-impure],
+		[Use XNU Private.exports [[default: no]]]),
+		[CPPFLAGS="$CPPFLAGS -DMACOS_IMPURE"],
+		[])
+])
+
+
diff --git a/config/user-libfetch.m4 b/config/user-libfetch.m4
index d961c6ca77a1..0b727e43dd66 100644
--- a/config/user-libfetch.m4
+++ b/config/user-libfetch.m4
@@ -45,8 +45,14 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_LIBFETCH], [
 			LIBFETCH_IS_LIBCURL=1
 			if test "$(curl-config --built-shared)" = "yes"; then
 				LIBFETCH_DYNAMIC=1
-				LIBFETCH_SONAME="libcurl.so.4"
-				LIBFETCH_LIBS="-ldl"
+				dnl # why are we hardcoding libnames?
+				AM_COND_IF([BUILD_MACOS], [
+					LIBFETCH_SONAME="libcurl.4.dylib"
+					LIBFETCH_LIBS=""
+				], [
+					LIBFETCH_SONAME="libcurl.so.4"
+					LIBFETCH_LIBS="-ldl"
+				])
 				AC_MSG_RESULT([libcurl])
 			else
 				LIBFETCH_LIBS="$(curl-config --libs)"
diff --git a/config/user.m4 b/config/user.m4
index 87df8c7ccabd..5cb47026b61c 100644
--- a/config/user.m4
+++ b/config/user.m4
@@ -24,8 +24,11 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
 	ZFS_AC_CONFIG_USER_LIBATOMIC
 	ZFS_AC_CONFIG_USER_LIBFETCH
 	ZFS_AC_CONFIG_USER_AIO_H
-	ZFS_AC_CONFIG_USER_CLOCK_GETTIME
-	ZFS_AC_CONFIG_USER_PAM
+	AM_COND_IF([BUILD_MACOS], [
+		ZFS_AC_MACOS_IMPURE_ENABLE], [
+		ZFS_AC_CONFIG_USER_CLOCK_GETTIME
+		ZFS_AC_CONFIG_USER_PAM
+	])
 	ZFS_AC_CONFIG_USER_RUNSTATEDIR
 	ZFS_AC_CONFIG_USER_MAKEDEV_IN_SYSMACROS
 	ZFS_AC_CONFIG_USER_MAKEDEV_IN_MKDEV
diff --git a/config/zfs-build.m4 b/config/zfs-build.m4
index 5f36569fe25b..155c7dbf6bd0 100644
--- a/config/zfs-build.m4
+++ b/config/zfs-build.m4
@@ -538,6 +538,8 @@ AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
 			VENDOR=freebsd ;
 		elif test -f /etc/openEuler-release ; then
 			VENDOR=openeuler ;
+		elif test -f /usr/bin/sw_vers ; then
+			VENDOR=apple ;
 		else
 			VENDOR= ;
 		fi],
@@ -563,6 +565,7 @@ AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
 		debian)     DEFAULT_PACKAGE=deb  ;;
 		freebsd)    DEFAULT_PACKAGE=pkg  ;;
 		openeuler)  DEFAULT_PACKAGE=rpm  ;;
+		apple)      DEFAULT_PACKAGE=pkg  ;;
 		*)          DEFAULT_PACKAGE=rpm  ;;
 	esac
 	AC_MSG_RESULT([$DEFAULT_PACKAGE])
@@ -606,6 +609,7 @@ AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
 		ubuntu)     initconfdir=/etc/default   ;;
 		debian)     initconfdir=/etc/default   ;;
 		freebsd)    initconfdir=$sysconfdir/rc.conf.d;;
+		apple)      initconfdir=${prefix}/etc/launchd/launchd.d/ ;;
 		*)          initconfdir=/etc/default   ;;
 	esac
 	AC_MSG_RESULT([$initconfdir])
@@ -639,7 +643,7 @@ dnl # Default ZFS package configuration
 dnl #
 AC_DEFUN([ZFS_AC_PACKAGE], [
 	ZFS_AC_DEFAULT_PACKAGE
-	AS_IF([test x$VENDOR != xfreebsd], [
+	AS_IF([test x$VENDOR != xfreebsd -a x$VENDOR != xapple], [
 		ZFS_AC_RPM
 		ZFS_AC_DPKG
 		ZFS_AC_ALIEN