public static final MacOs MAC_OS = new MacOs();
    public static final Solaris SOLARIS = new Solaris();
    public static final Linux LINUX = new Linux();
    public static final FreeBSD FREE_BSD = new FreeBSD();
    public static final Unix UNIX = new Unix();
    private static OperatingSystem currentOs;
    private final String toStringValue;
    private final String osName;
    private final String osVersion;

.Installing with a package manager
[%collapsible]
====

link:http://sdkman.io[SDKMAN!] is a tool for managing parallel versions of multiple Software Development Kits on most Unix-like systems (macOS, Linux, Cygwin, Solaris and FreeBSD).
Gradle is deployed and maintained by SDKMAN!:

----
❯ sdk install gradle
----

Other package managers are available, but the version of Gradle distributed by them is not controlled by Gradle, Inc.

			if i == issue34264Index && runtime.GOOS == "freebsd" && isEADDRINUSE(err) {
				// https://golang.org/issue/34264: FreeBSD through at least version 12.2
				// has been observed to fail with EADDRINUSE when dialing from an IPv6
				// local address to an IPv4 remote address.
				t.Logf("%s %v->%s: got %v; want %v", tt.network, tt.laddr, tt.raddr, err, tt.error)
				t.Logf("(spurious EADDRINUSE ignored on freebsd: see https://golang.org/issue/34264)")

	if kind == kindOpenFile {
		switch runtime.GOOS {
		case "darwin", "ios", "dragonfly", "freebsd", "netbsd", "openbsd":
			var st syscall.Stat_t
			err := ignoringEINTR(func() error {
				return syscall.Fstat(fd, &st)
			})
			typ := st.Mode & syscall.S_IFMT
			// Don't try to use kqueue with regular files on *BSDs.
			// On FreeBSD a regular file is always
			// reported as ready for writing.

// Copyright 2009,2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// FreeBSD system calls.
// This file is compiled as ordinary Go code,
// but it is also input to mksyscall,
// which parses the //sys lines and generates system call stubs.
// Note that sometimes we use a lowercase //sys name and wrap
// it in our own nicer implementation, either here or in

				{"foo.LOCAL.", "myhostname", hostLookupCgo},
				{"google.com", "myhostname", hostLookupFilesDNS},
			},
		},
		{
			name: "freebsdlinux_no_resolv_conf",
			c: &conf{
				goos: "freebsd",
			},
			resolv:    defaultResolvConf,
			nss:       nssStr(t, "foo: bar"),
			hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}},
		},
		// On OpenBSD, no resolv.conf means no DNS.

)

var trailingPort = regexp.MustCompile(`:([0-9]+)$`)

var osDefaultInheritEnv = func() []string {
	switch runtime.GOOS {
	case "darwin", "ios":
		return []string{"DYLD_LIBRARY_PATH"}
	case "android", "linux", "freebsd", "netbsd", "openbsd":
		return []string{"LD_LIBRARY_PATH"}
	case "hpux":
		return []string{"LD_LIBRARY_PATH", "SHLIB_PATH"}
	case "irix":
		return []string{"LD_LIBRARY_PATH", "LD_LIBRARYN32_PATH", "LD_LIBRARY64_PATH"}

		// Disable GDB tests on alpine until issue #54352 resolved.
		if strings.HasSuffix(testenv.Builder(), "-alpine") {
			t.Skip("skipping gdb tests on alpine; see https://golang.org/issue/54352")
		}
	case "freebsd":
		t.Skip("skipping gdb tests on FreeBSD; see https://golang.org/issue/29508")
	case "aix":
		if testing.Short() {
			t.Skip("skipping gdb tests on AIX; see https://golang.org/issue/35710")
		}
	case "plan9":

// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (darwin || dragonfly || freebsd || (linux && !android) || netbsd || openbsd) && cgo

// Note that this test does not work on Solaris: issue #22849.
// Don't run the test on Android because at least some versions of the
// C library do not define the posix_openpt function.

package signal_test

	if _, err := Lstat(path); err == nil {
		t.Fatalf("Lstat %q succeeded after RemoveAll", path)
	}
}

func TestRemoveAllLongPath(t *testing.T) {
	switch runtime.GOOS {
	case "aix", "darwin", "ios", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "illumos", "solaris":
		break
	default:
		t.Skip("skipping for not implemented platforms")
	}

	prevDir, err := Getwd()
	if err != nil {