Sudo installation instructions ============================== Sudo uses a `configure' script to probe the capabilities and type of the system in question. In this release, `configure' takes many more options than it did before. Please read this document fully before configuring and building sudo. You may also wish to read the file INSTALL.configure which explains more about the `configure' script. System requirements =================== To build sudo from the source distribution you need a POSIX-compliant operating system (any modern version of BSD, Linux or Unix should work), an ANSI/ISO C compiler that supports the "long long" type, variadic macros (a C99 feature) as well as the ar, make and ranlib utilities. If you wish to modify the parser then you will need flex version 2.5.2 or later and either bison or byacc (sudo comes with a pre-generated parser). You'll also have to run configure with the --with-devel option or pass DEVEL=1 to make. You can get flex from http://flex.sourceforge.net/. You can get GNU bison from ftp://ftp.gnu.org/pub/gnu/bison/ or any GNU mirror. Simple sudo installation ======================== For most systems and configurations it is possible simply to: 0) If you are upgrading from a previous version of sudo please read the info in the UPGRADE file before proceeding. 1) Read the `OS dependent notes' section for any particular "gotchas" relating to your operating system. 2) `cd' to the source or build directory and type `./configure' to generate a Makefile and config.h file suitable for building sudo. Before you actually run configure you should read the `Available configure options' section to see if there are any special options you may want or need. 4) Type `make' to compile sudo. If you are building sudo in a separate build tree (apart from the sudo source) GNU make will probably be required. If `configure' did its job properly (and you have a supported configuration) there won't be any problems. If this doesn't work, take a look at the doc/TROUBLESHOOTING file for tips on what might have gone wrong. Please mail us if you have a fix or if you are unable to come up with a fix (address at EOF). 5) Type `make install' (as root) to install sudo, visudo, the man pages, and a skeleton sudoers file. Note that the install will not overwrite an existing sudoers file. You can also install various pieces the package via the install-binaries, install-doc, and install-sudoers make targets. 6) Edit the sudoers file with `visudo' as necessary for your site. You will probably want to refer the sample.sudoers file and sudoers man page included with the sudo package. 7) If you want to use syslogd(8) to do the logging, you'll need to update your /etc/syslog.conf file. See the sample.syslog.conf file included in the distribution for an example. Available configure options =========================== This section describes flags accepted by the sudo's `configure' script. Defaults are listed in brackets after the description. Configuration: --cache-file=FILE Cache test results in FILE --config-cache, -C Alias for `--cache-file=config.cache' --help, -h Print the usage/help info --no-create, -n Do not create output files --quiet, --silent, -q Do not print `checking...' messages --srcdir=DIR Find the sources in DIR [configure dir or `..'] Directory and file names: --prefix=PREFIX Install architecture-independent files in PREFIX. [/usr/local] --exec-prefix=EPREFIX Install architecture-dependent files in EPREFIX. This includes the executables and plugins. [same as PREFIX] --bindir=DIR Install `sudo', `sudoedit' and `sudoreplay' in DIR. [EPREFIX/bin] --sbindir=DIR Install `visudo' in DIR. [EPREFIX/sbin] --libexecdir=DIR Install plugins and helper programs in DIR/sudo [PREFIX/libexec/sudo] --sysconfdir=DIR Look for `sudo.conf' and `sudoers' files in DIR. [/etc] --includedir=DIR Install sudo_plugin.h include file in DIR [PREFIX/include] --datarootdir=DIR Root directory for platform-independent data files [PREFIX/share] --localedir=DIR Install sudo and sudoers locale files in DIR [DATAROOTDIR/locale] --mandir=DIR Install man pages in DIR [PREFIX/man] --docdir=DIR Install other sudo documentation in DIR [DATAROOTDIR/doc/sudo] --with-plugindir=PATH Set the directory that sudo looks in to find the policy and I/O logging plugins. Defaults to the LIBEXEC/sudo. --with-timedir=PATH Use PATH to store the sudo time stamp files. By default, the first existing directory in the following list is used: /var/db, /var/lib, /var/adm, /usr/adm. Compilation options: --disable-hardening Disable the use of compiler/linker exploit mitigation options which are enabled by default. This includes compiling with _FORTIFY_SOURCE defined to 2, building with -fstack-protector and linking with -zrelro, where supported. --enable-pie Build sudo and related programs as as a position independent executables (PIE). This improves the effectiveness of address space layout randomization (ASLR) on systems that support it. Sudo will create PIE binaries by default on Linux systems. --disable-pie Disable the creation of position independent executables (PIE), even if the compiler creates PIE binaries by default. This option may be needed on some Linux systems where PIE binaries are not fully supported. --disable-rpath By default, configure will use -Rpath in addition to -Lpath when passing library paths to the loader. This option will disable the use of -Rpath. --disable-shared Disable dynamic shared object support. By default, sudo is built with a plugin API capable of loading arbitrary policy and I/O logging plugins. If the --disable-shared option is specified, this support is disabled and the default sudoers policy and I/O plugins are embedded in the sudo binary itself. This will also disable the noexec option as it too relies on dynamic shared object support. --enable-zlib[=location] Enable the use of the zlib compress library when storing I/O log files. If specified, location is the base directory containing the zlib include and lib directories. The special values "system" and "builtin" can be used to indicate that the system version of zlib should be used or that the version of zlib shipped with sudo should be used instead. If this option is not specified, configure will use the system zlib if it is present. --with-incpath=DIR Adds the specified directory (or directories) to CPPFLAGS so configure and the compiler will look there for include files. Multiple directories may be specified as long as they are space separated. E.g. --with-incpath="/usr/local/include /opt/include" --with-libpath=DIR Adds the specified directory (or directories) to LDFLAGS so configure and the compiler will look there for libraries. Multiple directories may be specified as with --with-incpath. --with-libraries=LIBRARY Adds the specified library (or libraries) to SUDO_LIBS and and VISUDO_LIBS so sudo will link against them. If the library doesn't start with `-l' or end in `.a' or `.o' a `-l' will be pre-pended to it. Multiple libraries may be specified as long as they are space separated. --with-libtool=PATH By default, sudo will use the included version of libtool to build shared libraries. The --with-libtool option can be used to specify a different version of libtool to use. The special values "system" and "builtin" can be used in place of a path to denote the default system libtool (obtained via the user's PATH) and the default libtool that comes with sudo. Optional features: --disable-root-mailer By default sudo will run the mailer as root when tattling on a user so as to prevent that user from killing the mailer. With this option, sudo will run the mailer as the invoking user which some people consider to be safer. --enable-nls[=location] Enable natural language support using the gettext() family of functions. If specified, location is the base directory containing the libintl include and lib directories. If this option is not specified, configure will look for the gettext() family of functions in the standard C library first, then check for a standalone libintl (linking with libiconv as needed). --disable-nls Disable natural language support. By default, sudo will use the gettext() family of functions, if available, to implement messages in the invoking user's native language. Note that translations do not exist for all languages. --with-ldap[=DIR] Enable LDAP support. If specified, DIR is the base directory containing the LDAP include and lib directories. Please see README.LDAP for more information. --with-ldap-conf-file=PATH Path to LDAP configuration file. If specified, sudo reads this file instead of /etc/ldap.conf to locate the LDAP server. --with-ldap-secret-file=PATH Path to LDAP secret password file. If specified, sudo uses this file instead of /etc/ldap.secret to read the secret password when rootbinddn is specified in the ldap config file. --with-logincap This adds support for login classes specified in /etc/login.conf. It is enabled by default on BSD/OS, Darwin, FreeBSD, OpenBSD and NetBSD (where available). By default, a login class is not applied unless the 'use_loginclass' option is defined in sudoers or the user specifies a class on the command line. --with-interfaces=no, --without-interfaces This option keeps sudo from trying to glean the ip address from each attached Ethernet interface. It is only useful on a machine where sudo's interface reading support does not work, which may be the case on some SysV-based OS's using STREAMS. --with-noexec[=PATH] Enable support for the "noexec" functionality which prevents a dynamically-linked program being run by sudo from executing another program (think shell escapes). Please see the "PREVENTING SHELL ESCAPES" section in the sudoers man page for details. If specified, PATH should be a fully qualified path name, e.g. /usr/local/libexec/sudo_noexec.so. If PATH is "no", noexec support will not be compiled in. The default is to compile noexec support if libtool supports building shared objects on your OS. --with-selinux Enable support for role based access control (RBAC) on systems that support SELinux. --with-sssd Enable support for using the System Security Services Daemon (SSSD) as a sudoers data source. For more information on SSD, see http://fedorahosted.org/sssd/ --with-sssd-lib=PATH Specify the path to the SSSD shared library, which is loaded at run-time. Operating system-specific options: --disable-setreuid Disable use of the setreuid() function for operating systems where it is broken. For instance, 4.4BSD has setreuid() that is not fully functional. --disable-setresuid Disable use of the setresuid() function for operating systems where it is broken (none currently known). --enable-admin-flag Enable the creation of an Ubuntu-style admin flag file the first time sudo is run. --with-bsm-audit Enable support for sudo BSM audit logs on systems that support it. This includes recent versions of FreeBSD, Mac OS X and Solaris. --with-linux-audit Enable audit support for Linux systems. Audits attempts to run a command as well as SELinux role changes. --with-man Use the "man" macros for manual pages. By default, mdoc versions of the manuals are installed if supported. This can be used to override configure's test for "nroff -mdoc" support. --with-mdoc Use the "mdoc" macros for manual pages. By default, mdoc versions of the manuals are installed if supported. This can be used to override configure's test for "nroff -mdoc" support. --with-netsvc[=PATH] Path to netsvc.conf or "no" to disable netsvc.conf support. If specified, sudo uses this file instead of /etc/netsvc.conf on AIX systems. If netsvc support is disabled but LDAP is enabled, sudo will check LDAP first, then the sudoers file. --with-nsswitch[=PATH] Path to nsswitch.conf or "no" to disable nsswitch support. If specified, sudo uses this file instead of /etc/nsswitch.conf. If nsswitch support is disabled but LDAP is enabled, sudo will check LDAP first, then the sudoers file. --with-project Enable support for Solaris project resource limits. This option is only available on Solaris 9 and above. Authentication options: --with-AFS Enable AFS support with Kerberos authentication. Should work under AFS 3.3. If your AFS doesn't have -laudit you should be able to link without it. --with-aixauth Enable support for the AIX 4.x general authentication function. This will use the authentication scheme specified for the user on the machine. It is on by default for AIX systems that support it. --with-bsdauth Enable support for BSD authentication. This is the default for BSD/OS and OpenBSD systems that support it. It is not possible to mix BSD authentication with other authentication methods (and there really should be no need to do so). Note that only the newer BSD authentication API is supported. If you don't have /usr/include/bsd_auth.h then you cannot use this. --with-DCE Enable DCE support for systems without PAM. Known to work on HP-UX 9.X, 10.X, and 11.0; other systems may require source code and/or `configure' changes. On systems with PAM support (such as HP-UX 11.0 and higher, Solaris, FreeBSD and Linux), the DCE PAM module (usually libpam_dce) should be used instead. --with-fwtk[=DIR] Enable TIS Firewall Toolkit (FWTK) 'authsrv' support. If specified, DIR is the base directory containing the compiled FWTK package (or at least the library and header files). --with-kerb5[=DIR] Enable Kerberos V support. If specified, DIR is the base directory containing the Kerberos V include and lib dirs. This uses Kerberos pass phrases for authentication but does not use the Kerberos cookie scheme. Will not work for Kerberos V older than version 1.1. --enable-kerb5-instance=string By default, the user name is used as the principal name when authenticating via Kerberos V. If this option is enabled, the specified instance string will be appended to the user name (separated by a slash) when creating the principal name. --with-opie[=DIR] Enable NRL OPIE OTP (One Time Password) support. If specified, DIR should contain include and lib directories with opie.h and libopie.a respectively. --with-otp-only This option is now just an alias for --without-passwd. --with-pam Enable PAM support. This is on by default for Darwin, FreeBSD, Linux, Solaris and HP-UX (version 11 and higher). NOTE: on RedHat Linux and Fedora you *must* have an /etc/pam.d/sudo file install. You may either use the sample.pam file included with sudo or use /etc/pam.d/su as a reference. The sample.pam file included with sudo may or may not work with other Linux distributions. On Solaris and HP-UX 11 systems you should check (and understand) the contents of /etc/pam.conf. Do a "man pam.conf" for more information and consider using the "debug" option, if available, with your PAM libraries in /etc/pam.conf to obtain syslog output for debugging purposes. --with-pam-login Enable a specific PAM session when sudo is given the -i option. This changes the PAM service name when sudo is run with the -i option from "sudo" to "sudo-i", allowing for a separate pam configuration for sudo's initial login mode. --disable-pam-session Disable sudo's PAM session support. This may be needed on older PAM implementations or on operating systems where opening a PAM session changes the utmp or wtmp files. If PAM session support is disabled, resource limits may not be updated for the command being run. --with-passwd=no, --without-passwd This option excludes authentication via the passwd (or shadow) file. It should only be used when another, alternative, authentication scheme is in use. --with-SecurID[=DIR] Enable SecurID support. If specified, DIR is directory containing libaceclnt.a, acexport.h, and sdacmvls.h. --with-skey[=DIR] Enable S/Key OTP (One Time Password) support. If specified, DIR should contain include and lib directories with skey.h and libskey.a respectively. --disable-sia Disable SIA support. This is the "Security Integration Architecture" on Digital UNIX. If you disable SIA sudo will use its own authentication routines. --disable-shadow Disable shadow password support. Normally, sudo will compile in shadow password support and use a shadow password if it exists. --enable-gss-krb5-ccache-name Use the gss_krb5_ccache_name() function to set the Kerberos V credential cache file name. By default, sudo will use the KRB5CCNAME environment variable to set this. While gss_krb5_ccache_name() provides a better API to do this it is not supported by all Kerberos V and SASL combinations. Development options: --enable-env-debug Enable debugging of the environment setting functions. This enables extra checks to make sure the environment does not become corrupted. --enable-warnings Enable compiler warnings when building sudo with gcc. --enable-werror Enable the -Werror compiler option when building sudo with gcc. --with-devel Configure development options. This will enable compiler warnings and set up the Makefile to be able to regenerate the sudoers parser as well as the manual pages. --with-efence Link with the "electric fence" debugging malloc. Options that set runtime-changeable default values: --disable-authentication By default, sudo requires the user to authenticate via a password or similar means. This options causes sudo to *not* require authentication. It is possible to turn authentication back on in sudoers via the PASSWD attribute. Sudoers option: !authenticate --disable-env-reset Disable environment resetting. This sets the default value of the "env_reset" Defaults option in sudoers to false. Sudoers option: !env_reset --disable-path-info Normally, sudo will tell the user when a command could not be found in their $PATH. Some sites may wish to disable this as it could be used to gather information on the location of executables that the normal user does not have access to. The disadvantage is that if the executable is simply not in the user's path, sudo will tell the user that they are not allowed to run it, which can be confusing. Sudoers option: path_info --disable-root-sudo Don't let root run sudo. This can be used to prevent people from "chaining" sudo commands to get a root shell by doing something like "sudo sudo /bin/sh". Sudoers option: !root_sudo --disable-zlib Disable the use of the zlib compress library when storing I/O log files. Sudoers option: !compress_io --enable-log-host Log the hostname in the log file. Sudoers option: log_host --enable-noargs-shell If sudo is invoked with no arguments it acts as if the "-s" flag had been given. That is, it runs a shell as root (the shell is determined by the SHELL environment variable, falling back on the shell listed in the invoking user's /etc/passwd entry). Sudoers option: shell_noargs --enable-shell-sets-home If sudo is invoked with the "-s" flag the HOME environment variable will be set to the home directory of the target user (which is root unless the "-u" option is used). This option effectively makes the "-s" flag imply "-H". Sudoers option: set_home --with-all-insults Include all the insult sets listed below. You must either specify --with-insults or enable insults in the sudoers file for this to have any effect. --with-askpass=PATH Set PATH as the "askpass" program to use when no tty is available. Typically, this is a graphical password prompter, similar to the one used by ssh. The program must take a prompt as an argument and print the received password to the standard output. This value may overridden at run-time in the sudo.conf file. --with-badpass-message="BAD PASSWORD MESSAGE" Message that is displayed if a user enters an incorrect password. The default is "Sorry, try again." unless insults are turned on. Sudoers option: badpass_message --with-badpri=PRIORITY Determines which syslog priority to log unauthenticated commands and errors. The following priorities are supported: alert, crit, debug, emerg, err, info, notice, and warning. Sudoers option: syslog_badpri --with-classic-insults Uses insults from sudo "classic." If you just specify --with-insults you will get the classic and CSOps insults. This is on by default if --with-insults is given. --with-csops-insults Insults the user with an extra set of insults (some quotes, some original) from a sysadmin group at CU (CSOps). You must specify --with-insults as well for this to have any effect. This is on by default if --with-insults is given. --with-editor=PATH Specify the default editor path for use by visudo. This may be a single path name or a colon-separated list of editors. In the latter case, visudo will choose the editor that matches the user's VISUAL or EDITOR environment variables or the first editor in the list that exists. The default is the path to vi on your system. Sudoers option: editor --with-env-editor Makes visudo consult the VISUAL and EDITOR environment variables before falling back on the default editor list (as specified by --with-editor). Note that this may create a security hole as it allows the user to run any arbitrary command as root without logging. A safer alternative is to use a colon-separated list of editors with the --with-editor option. visudo will then only use the VISUAL or EDITOR variables if they match a value specified via --with-editor. Sudoers option: env_editor --with-exempt=GROUP Users in the specified group don't need to enter a password when running sudo. This may be useful for sites that don't want their "core" sysadmins to have to enter a password but where Jr. sysadmins need to. You should probably use NOPASSWD in sudoers instead. Sudoers option: exempt_group --with-fqdn Define this if you want to put fully qualified host names in the sudoers file. Ie: instead of myhost you would use myhost.mydomain.edu. You may still use the short form if you wish (and even mix the two). Beware that turning FQDN on requires sudo to make DNS lookups which may make sudo unusable if your DNS is totally hosed. Also note that you must use the host's official name as DNS knows it. That is, you may not use a host alias (CNAME entry) due to performance issues and the fact that there is no way to get all aliases from DNS. Sudoers option: fqdn --with-goodpri=PRIORITY Determines which syslog priority to log successfully authenticated commands. The following priorities are supported: alert, crit, debug, emerg, err, info, notice, and warning. Sudoers option: syslog_goodpri --with-goons-insults Insults the user with lines from the "Goon Show" when an incorrect password is entered. You must either specify --with-insults or enable insults in the sudoers file for this to have any effect. --with-hal-insults Uses 2001-like insults when an incorrect password is entered. You must either specify --with-insults or enable insults in the sudoers file for this to have any effect. --with-ignore-dot If set, sudo will ignore '.' or '' (current dir) in $PATH. The $PATH itself is not modified. Sudoers option: ignore_dot --with-insults Define this if you want to be insulted for typing an incorrect password just like the original sudo(8). This is off by default. Sudoers option: insults --with-insults=disabled Include support for insults but disable them unless explicitly enabled in sudoers. Sudoers option: !insults --with-iologdir[=DIR] By default, sudo stores I/O log files in either /var/log/sudo-io, /var/adm/sudo-io, or /usr/log/sudo-io. If this option is specified, I/O logs will be stored in the indicated directory instead. Sudoers option: iolog_dir --with-lecture=no, --without-lecture Don't print the lecture the first time a user runs sudo. Sudoers option: !lecture --with-logfac=FACILITY Determines which syslog facility to log to. This requires a 4.3BSD or later version of syslog. You can still set this for ancient syslogs but it will have no effect. The following facilities are supported: authpriv (if your OS supports it), auth, daemon, user, local0, local1, local2, local3, local4, local5, local6, and local7. Sudoers option: syslog --with-logging=TYPE How you want to do your logging. You may choose "syslog", "file", or "both". Setting this to "syslog" is nice because you can keep all of your sudo logs in one place (see the sample.syslog.conf file). The default is "syslog". Sudoers options: syslog and logfile --with-loglen=NUMBER Number of characters per line for the file log. This is only used if you are to "file" or "both". This value is used to decide when to wrap lines for nicer log files. The default is 80. Setting this to 0 will disable the wrapping. Sudoers options: loglinelen --with-logpath=PATH Override the default location of the sudo log file and use "path" instead. By default will use /var/log/sudo.log if there is a /var/log dir, falling back to /var/adm/sudo.log or /usr/adm/sudo.log if not. Sudoers option: logfile --with-long-otp-prompt When validating with a One Time Password scheme (S/Key or OPIE), a two-line prompt is used to make it easier to cut and paste the challenge to a local window. It's not as pretty as the default but some people find it more convenient. Sudoers option: long_otp_prompt --with-mail-if-no-user=no, --without-mail-if-no-user Normally, sudo will mail to the "alertmail" user if the user invoking sudo is not in the sudoers file. This option disables that behavior. Sudoers option: mail_no_user --with-mail-if-no-host Send mail to the "alermail" user if the user exists in the sudoers file, but is not allowed to run commands on the current host. Sudoers option: mail_no_host --with-mail-if-noperms Send mail to the "alermail" user if the user is allowed to use sudo but the command they are trying is not listed in their sudoers file entry. Sudoers option: mail_no_perms --with-mailsubject="SUBJECT OF MAIL" Subject of the mail sent to the "mailto" user. The token "%h" will expand to the hostname of the machine. Default is "*** SECURITY information for %h ***". Sudoers option: mailsub --with-mailto=USER|MAIL_ALIAS User (or mail alias) that mail from sudo is sent to. This should go to a sysadmin at your site. The default is "root". Sudoers option: mailto --with-passprompt="PASSWORD PROMPT" Default prompt to use when asking for a password; can be overridden via the -p option and the SUDO_PROMPT environment variable. Supports the "%H", "%h", "%U" and "%u" escapes as documented in the sudo manual page. The default value is "Password:". Sudoers option: passprompt --with-password-timeout=NUMBER Number of minutes before the sudo password prompt times out. The default is 5, set this to 0 for no password timeout. Sudoers option: passwd_timeout --with-passwd-tries=NUMBER Number of tries a user gets to enter his/her password before sudo logs the failure and exits. The default is 3. Sudoers option: passwd_tries --with-pc-insults Replace politically incorrect insults with less objectionable ones. --with-runas-default=USER The default user to run commands as if the -u flag is not specified on the command line. This defaults to "root". Sudoers option: runas_default --with-secure-path[=PATH] Path used for every command run from sudo(8). If you don't trust the people running sudo to have a sane PATH environment variable you may want to use this. Another use is if you want to have the "root path" be separate from the "user path." You will need to customize the path for your site. NOTE: this is not applied to users in the group specified by --with-exemptgroup. If you do not specify a path, "/bin:/usr/ucb:/usr/bin:/usr/sbin:/sbin:/usr/etc:/etc" is used. Sudoers option: secure_path --with-sendmail=PATH Override configure's guess as to the location of sendmail. Sudoers option: mailerpath --with-sendmail=no, --without-sendmail Do not use sendmail to mail messages to the "mailto" user. Use only if you don't run sendmail or the equivalent. Sudoers options: !mailerpath or !mailto --with-sudoers-mode=MODE File mode for the sudoers file (octal). Note that if you wish to NFS-mount the sudoers file this must be group readable. This value may overridden at run-time in the sudo.conf file. The default mode is 0440. --with-sudoers-uid=UID User id that "owns" the sudoers file. Note that this is the numeric id, *not* the symbolic name. This value may overridden at run-time in the sudo.conf file. The default is 0. --with-sudoers-gid=GID Group id that "owns" the sudoers file. Note that this is the numeric id, *not* the symbolic name. This value may overridden at run-time in the sudo.conf file. The default is 0. --with-timeout=NUMBER Number of minutes that can elapse before sudo will ask for a passwd again. The default is 5, set this to 0 to always prompt for a password. Sudoers option: timestamp_timeout --with-tty-tickets=no, --without-tty-tickets By default, sudo uses a different ticket file for each user/tty combo. With this option disabled, a single ticket will be used for all of a user's login sessions. Sudoers option: tty_tickets --with-umask=MASK Umask to use when running the root command. The default is 0022. Sudoers option: umask --with-umask=no, --without-umask Preserves the umask of the user invoking sudo. Sudoers option: !umask --with-umask-override Use the umask specified in sudoers even if it is less restrictive than the user's. The default is to use the intersection of the user's umask and the umask specified in sudoers. Sudoers option: umask_override OS dependent notes ================== HP-UX: The default C compiler shipped with HP-UX is not an ANSI compiler. You must use either the HP ANSI C compiler or gcc to build sudo. Binary packages of gcc are available from http://hpux.connect.org.uk/. To prevent PAM from overriding the value of umask on HP-UX 11, you will need to add a line like the following to /etc/pam.conf: sudo session required libpam_hpsec.so.1 bypass_umask If every command run via sudo displays information about the last successful login and the last authentication failure you should make use an /etc/pam.conf line like: sudo session required libpam_hpsec.so.1 bypass_umask bypass_last_login Linux: PAM and LDAP headers are not installed by default on most Linux systems. You will need to install the "pam-dev" package if /usr/include/security/pam_appl.h is not present on your system. If you wish to build with LDAP support you will also need the openldap-devel package. Mac OS X: The pseudo-tty support in the Mac OS X kernel has bugs related to its handling of the SIGTSTP, SIGTTIN and SIGTTOU signals. It does not restart reads and writes when those signals are delivered. This may cause problems for some commands when I/O logging is enabled. The issue has been reported to Apple and is bug id #7952709. Solaris: You need to have a C compiler in order to build sudo. Since Solaris does not come with one by default this means that you either need to either install the Solaris Studio compiler suite, available for free from www.oracle.com, or install the GNU C compiler (gcc) which is can be installed via the pkg utility on Solaris 11 and higher and is distributed on the Solaris Companion CD for older Solaris releases. You can also download gcc packages from http://www.opencsw.org/packages/CSWgcc4core/ SunOS 4.x: SunOS does not ship with an ANSI C compiler. You will need to install an ANSI compiler such as gcc to build sudo. The /bin/sh shipped with SunOS blows up while running configure. You can work around this by installing bash or zsh. If you have bash or zsh in your path, configure will use it automatically.