1OPAM-INSTALL(1)                   Opam Manual                  OPAM-INSTALL(1)
2
3
4

NAME

6       opam-install - Install a list of packages.
7

SYNOPSIS

9       opam install [OPTION]... [PACKAGES]...
10

DESCRIPTION

12       This command installs one or more packages inside the currently
13       selected switch (see opam switch). Once installed, you can remove
14       packages with opam remove, upgrade them with opam upgrade, and list
15       them with opam list. See opam pin as well to manage package versions,
16       reroute existing packages or add packages that are not defined in the
17       repositories.
18
19       All required dependencies of the selected packages will be installed
20       first. Any already installed packages having dependencies, or optional
21       dependencies to the changed packages will be recompiled. The proposed
22       solution may also imply removing incompatible or conflicting packages.
23
24       If paths are provided as argument instead of packages, they are assumed
25       to point to either project source directories containing one or more
26       package definitions (opam files), or directly to opam files. Then the
27       corresponding packages will be pinned to their local directory and
28       installed (unless --deps-only was specified).
29

ARGUMENTS

31       PACKAGES
32           List of package names, with an optional version or constraint, e.g
33           `pkg', `pkg.1.0' or `pkg>=0.5' ; or files or directory names
34           containing package description, with explicit directory (e.g.
35           `./foo.opam' or `.')
36

OPTIONS

38       --assume-built
39           For use on locally-pinned packages: assume they have already been
40           correctly built, and only run their installation instructions,
41           directly from their source directory. This skips the build
42           instructions and can be useful to install packages that are being
43           worked on. Implies --inplace-build. No locally-pinned packages will
44           be skipped.
45
46       --check
47           Exit with 0 if all the dependencies of PACKAGES are already
48           installed. If not, output the names of the missing dependencies to
49           stdout, and exits with 1.
50
51       --depext-only
52           Resolves the package installation normally, but only installs the
53           required system dependencies, without affecting the opam switch
54           state or installing opam packages.
55
56       --deps-only
57           Install all its dependencies, but don't actually install the
58           package.
59
60       --destdir=DIR
61           Copy the files installed by the given package within the current
62           opam switch below the prefix DIR, respecting their hierarchy, after
63           installation. Caution, calling this can overwrite, but never remove
64           files, even if they were installed by a previous use of --destdir,
65           e.g. on a previous version of the same package. See opam remove
66           --destdir to revert.
67
68       --download-only
69           Fetch the sources of the packages, but don't build or install
70           anything.
71
72       --ignore-conflicts
73           Used with --deps-only, ignores conflicts of given package
74
75       -j JOBS, --jobs=JOBS
76           Set the maximal number of concurrent jobs to use. The default value
77           is calculated from the number of cores. You can also set it using
78           the $OPAMJOBS environment variable.
79
80       --no
81           Answer no to all opam yes/no questions without prompting. See also
82           --confirm-level. This is equivalent to setting $OPAMNO to "true".
83
84       --restore
85           Attempt to restore packages that were marked for installation but
86           have been removed due to errors
87
88       --set-root
89           Mark given packages as installed roots. This is the default for
90           newly manually-installed packages.
91
92       --unset-root
93           Mark given packages as "installed automatically".
94
95       -y, --yes
96           Answer yes to all opam yes/no questions without prompting. See also
97           --confirm-level. This is equivalent to setting $OPAMYES to "true".
98

PACKAGE BUILD OPTIONS

100       --assume-depexts
101           Skip the installation step for any missing system packages, and
102           attempt to proceed with compilation of the opam packages anyway. If
103           the installation is successful, opam won't prompt again about these
104           system packages. Only meaningful if external dependency handling is
105           enabled.
106
107       -b, --keep-build-dir
108           Keep the build directories after compiling packages. This is
109           equivalent to setting $OPAMKEEPBUILDDIR to "true".
110
111       --build-doc
112           Removed in 2.1, use --with-doc instead.
113
114       --build-test
115           Removed in 2.1, use --with-test instead.
116
117       -d, --with-doc
118           Build the package documentation. This only affects packages listed
119           on the command-line. This is equivalent to setting $OPAMWITHDOC (or
120           the deprecated $OPAMBUILDDOC) to "true".
121
122       --dry-run
123           Simulate the command, but don't actually perform any changes. This
124           also can be set with environment variable $OPAMDEBUG.
125
126       --fake
127           This option registers the actions into the opam database, without
128           actually performing them. WARNING: This option is dangerous and
129           likely to break your opam environment. You probably want --dry-run.
130           You've been warned.
131
132       --ignore-constraints-on[=PACKAGES] (default=)
133           Forces opam to ignore version constraints on all dependencies to
134           the listed packages. This can be used to test compatibility, but
135           expect builds to break when using this. Note that version
136           constraints on optional dependencies and conflicts are unaffected.
137           This is equivalent to setting $OPAMIGNORECONSTRAINTS.
138
139       --inplace-build
140           When compiling a package which has its source bound to a local
141           directory, process the build and install actions directly in that
142           directory, rather than in a clean copy handled by opam. This only
143           affects packages that are explicitly listed on the command-line.
144           This is equivalent to setting $OPAMINPLACEBUILD to "true".
145
146       --lock-suffix=SUFFIX (absent=locked)
147           Set locked files suffix to SUFFIX.
148
149       --locked
150           In commands that use opam files found from pinned sources, if a
151           variant of the file with an added .locked extension is found (e.g.
152           foo.opam.locked besides foo.opam), that will be used instead. This
153           is typically useful to offer a more specific set of dependencies
154           and reproduce similar build contexts, hence the name. The
155           lockoption can be used to generate such files, based on the
156           versions of the dependencies currently installed on the host. This
157           is equivalent to setting the $OPAMLOCKED environment variable. Note
158           that this option doesn't generally affect already pinned packages.
159
160       -m MAKE, --make=MAKE
161           Removed in 2.1, use opam config set[-global] make MAKE instead.
162
163       --no-checksums
164           Do not verify the checksum of downloaded archives.This is
165           equivalent to setting $OPAMNOCHECKSUMS to "true".
166
167       --no-depexts
168           Temporarily disables handling of external dependencies. This can be
169           used if a package is not available on your system package manager,
170           but you installed the required dependency by hand. Implies
171           --assume-depexts, and stores the exceptions upon success as well.
172
173       --require-checksums
174           Reject the installation of packages that don't provide a checksum
175           for the upstream archives. This is equivalent to setting
176           $OPAMREQUIRECHECKSUMS to "true".
177
178       --reuse-build-dir
179           Reuse existing build directories (kept by using --keep-build-dir),
180           instead of compiling from a fresh clone of the source. This can be
181           faster, but also lead to failures if the build systems of the
182           packages don't handle upgrades of dependencies well. This is
183           equivalent to setting $OPAMREUSEBUILDDIR to "true".
184
185       --show-actions
186           Call the solver and display the actions. Don't perform any changes.
187           This is equivalent to setting $OPAMSHOW.
188
189       --skip-updates
190           When running an install, upgrade or reinstall on source-pinned
191           packages, they are normally updated from their origin first. This
192           flag disables that behaviour and will keep them to their version in
193           cache. This is equivalent to setting $OPAMSKIPUPDATE.
194
195       -t, --with-test
196           Build and run the package unit-tests. This only affects packages
197           listed on the command-line. This is equivalent to setting
198           $OPAMWITHTEST (or the deprecated $OPAMBUILDTEST) to "true".
199
200       --unlock-base
201           Removed in 2.1, use --update-invariant instead.
202
203       --update-invariant
204           Allow changes to the packages set as switch base (typically, the
205           main compiler). Use with caution. This is equivalent to setting the
206           $OPAMUNLOCKBASE environment variable
207

COMMON OPTIONS

209       These options are common to all commands.
210
211       --best-effort
212           Don't fail if all requested packages can't be installed: try to
213           install as many as possible. Note that not all external solvers may
214           support this option (recent versions of aspcud or mccs should).
215           This is equivalent to setting $OPAMBESTEFFORT environment variable.
216
217       --cli=MAJOR.MINOR (absent=2.1)
218           Use the command-line interface syntax and semantics of MAJOR.MINOR.
219           Intended for any persistent use of opam (scripts, blog posts,
220           etc.), any version of opam in the same MAJOR series will behave as
221           for the specified MINOR release. The flag was not available in opam
222           2.0, so to select the 2.0 CLI, set the OPAMCLI environment variable
223           to 2.0 instead of using this parameter.
224
225       --color=WHEN
226           Colorize the output. WHEN must be one of `always', `never' or
227           `auto'.
228
229       --confirm-level=LEVEL
230           Confirmation level, LEVEL must be one of `ask', `no', `yes' or
231           `unsafe-yes'. Can be specified more than once. If --yes or --no are
232           also given, the value of the last --confirm-level is taken into
233           account. This is equivalent to setting  $OPAMCONFIRMLEVEL`.
234
235       --criteria=CRITERIA
236           Specify user preferences for dependency solving for this run.
237           Overrides both $OPAMCRITERIA and $OPAMUPGRADECRITERIA. For details
238           on the supported language, and the external solvers available, see
239           http://opam.ocaml.org/doc/External_solvers.html. A general guide to
240           using solver preferences can be found at
241           http://www.dicosmo.org/Articles/usercriteria.pdf.
242
243       --cudf=FILENAME
244           Debug option: Save the CUDF requests sent to the solver to
245           FILENAME-<n>.cudf.
246
247       --debug
248           Print debug message to stderr. This is equivalent to setting
249           $OPAMDEBUG to "true".
250
251       --debug-level=LEVEL
252           Like --debug, but allows specifying the debug level (--debug sets
253           it to 1). Equivalent to setting $OPAMDEBUG to a positive integer.
254
255       --git-version
256           Print the git version of opam, if set (i.e. you are using a
257           development version), and exit.
258
259       --help[=FMT] (default=auto)
260           Show this help in format FMT. The value FMT must be one of `auto',
261           `pager', `groff' or `plain'. With `auto', the format is `pager` or
262           `plain' whenever the TERM env var is `dumb' or undefined.
263
264       --ignore-pin-depends
265           Ignore extra pins required by packages that get pinned, either
266           manually through opam pin or through opam install DIR. This is
267           equivalent to setting IGNOREPINDEPENDS=true.
268
269       --json=FILENAME
270           Save the results of the opam run in a computer-readable file. If
271           the filename contains the character `%', it will be replaced by an
272           index that doesn't overwrite an existing file. Similar to setting
273           the $OPAMJSON variable.
274
275       --no-aspcud
276           Removed in 2.1.
277
278       --no-auto-upgrade
279           When configuring or updating a repository that is written for an
280           earlier opam version (1.2), opam internally converts it to the
281           current format. This disables this behaviour. Note that
282           repositories should define their format version in a 'repo' file at
283           their root, or they will be assumed to be in the older format. It
284           is, in any case, preferable to upgrade the repositories manually
285           using opam admin upgrade [--mirror URL] when possible.
286
287       --no-self-upgrade
288           Opam will replace itself with a newer binary found at OPAMROOT/opam
289           if present. This disables this behaviour.
290
291       -q, --quiet
292           Disables --verbose.
293
294       --root=ROOT
295           Use ROOT as the current root path. This is equivalent to setting
296           $OPAMROOT to ROOT.
297
298       --safe, --readonly
299           Make sure nothing will be automatically updated or rewritten.
300           Useful for calling from completion scripts, for example. Will fail
301           whenever such an operation is needed ; also avoids waiting for
302           locks, skips interactive questions and overrides the $OPAMDEBUG
303           variable. This is equivalent to set environment variable $OPAMSAFE.
304
305       --solver=CMD
306           Specify the CUDF solver to use for resolving package installation
307           problems. This is either a predefined solver (this version of opam
308           supports builtin-mccs+lp(), builtin-mccs+glpk,
309           builtin-dummy-z3-solver, builtin-dummy-0install-solver, aspcud,
310           mccs, aspcud-old, packup), or a custom command that should contain
311           the variables %{input}%, %{output}%, %{criteria}%, and optionally
312           %{timeout}%. This is equivalent to setting $OPAMEXTERNALSOLVER.
313
314       --strict
315           Fail whenever an error is found in a package definition or a
316           configuration file. The default is to continue silently if
317           possible.
318
319       --switch=SWITCH
320           Use SWITCH as the current compiler switch. This is equivalent to
321           setting $OPAMSWITCH to SWITCH.
322
323       --use-internal-solver
324           Disable any external solver, and use the built-in one (this
325           requires that opam has been compiled with a built-in solver). This
326           is equivalent to setting $OPAMNOASPCUD or $OPAMUSEINTERNALSOLVER.
327
328       -v, --verbose
329           Be more verbose. One -v shows all package commands, repeat to also
330           display commands called internally (e.g. tar, curl, patch etc.)
331           Repeating n times is equivalent to setting $OPAMVERBOSE to "n".
332
333       --version
334           Show version information.
335
336       -w, --working-dir
337           Whenever updating packages that are bound to a local,
338           version-controlled directory, update to the current working state
339           of their source instead of the last committed state, or the ref
340           they are pointing to. As source directory is copied as it is, if it
341           isn't clean it may result on a opam build failure.This only affects
342           packages explicitly listed on the command-line.It can also be set
343           with $OPAMWORKINGDIR.
344

ENVIRONMENT

346       Opam makes use of the environment variables listed here. Boolean
347       variables should be set to "0", "no", "false" or the empty string to
348       disable, "1", "yes" or "true" to enable.
349
350       OPAMALLPARENS surround all filters with parenthesis.
351
352       OPAMASSUMEDEPEXTS see option `--assume-depexts'.
353
354       OPAMAUTOREMOVE see remove option `--auto-remove'.
355
356       OPAMBESTEFFORT see option `--best-effort'.
357
358       OPAMBESTEFFORTPREFIXCRITERIA sets the string that must be prepended to
359       the criteria when the `--best-effort' option is set, and is expected to
360       maximise the `opam-query' property in the solution.
361
362       OPAMBUILDDOC Removed in 2.1.
363
364       OPAMBUILDTEST Removed in 2.1.
365
366       OPAMCLI see option `--cli'.
367
368       OPAMCOLOR when set to always or never, sets a default value for the
369       `--color' option.
370
371       OPAMCONFIRMLEVEL see option `--confirm-level`. OPAMCONFIRMLEVEL has
372       priority over OPAMYES and OPAMNO.
373
374       OPAMCRITERIA specifies user preferences for dependency solving. The
375       default value depends on the solver version, use `config report' to
376       know the current setting. See also option --criteria.
377
378       OPAMCUDFFILE save the cudf graph to file-actions-explicit.dot.
379
380       OPAMCUDFTRIM controls the filtering of unrelated packages during CUDF
381       preprocessing.
382
383       OPAMCURL can be used to select a given 'curl' program. See OPAMFETCH
384       for more options.
385
386       OPAMDEBUG see options `--debug' and `--debug-level'.
387
388       OPAMDEBUGSECTIONS if set, limits debug messages to the space-separated
389       list of sections. Sections can optionally have a specific debug level
390       (for example, CLIENT:2 or CLIENT CUDF:2), but otherwise use
391       `--debug-level'.
392
393       OPAMDIGDEPTH defines how aggressive the lookup for conflicts during
394       CUDF preprocessing is.
395
396       OPAMDOWNLOADJOBS sets the maximum number of simultaneous downloads.
397
398       OPAMDROPWORKINGDIR overrides packages previously updated with
399       --working-dir on update. Without this variable set, opam would keep
400       them unchanged unless explicitly named on the command-line.
401
402       OPAMDRYRUN see option `--dry-run'.
403
404       OPAMEDITOR sets the editor to use for opam file editing, overrides
405       $EDITOR and $VISUAL.
406
407       OPAMERRLOGLEN sets the number of log lines printed when a sub-process
408       fails. 0 to print all.
409
410       OPAMEXTERNALSOLVER see option `--solver'.
411
412       OPAMFAKE see option `--fake'.
413
414       OPAMFETCH specifies how to download files: either `wget', `curl' or a
415       custom command where variables %{url}%, %{out}%, %{retry}%,
416       %{compress}% and %{checksum}% will be replaced. Overrides the
417       'download-command' value from the main config file.
418
419       OPAMFIXUPCRITERIA same as OPAMUPGRADECRITERIA, but specific to fixup.
420
421       OPAMIGNORECONSTRAINTS see install option `--ignore-constraints-on'.
422
423       OPAMIGNOREPINDEPENDS see option `--ignore-pin-depends'.
424
425       OPAMINPLACEBUILD see option `--inplace-build'.
426
427       OPAMJOBS sets the maximum number of parallel workers to run.
428
429       OPAMJSON log json output to the given file (use character `%' to index
430       the files).
431
432       OPAMKEEPBUILDDIR see install option `--keep-build-dir'.
433
434       OPAMKEEPLOGS tells opam to not remove some temporary command logs and
435       some backups. This skips some finalisers and may also help to get more
436       reliable backtraces.
437
438       OPAMLOCKED combination of `--locked' and `--lock-suffix' options.
439
440       OPAMLOGS logdir sets log directory, default is a temporary directory in
441       /tmp
442
443       OPAMMAKECMD set the system make command to use.
444
445       OPAMMERGEOUT merge process outputs, stderr on stdout.
446
447       OPAMNO answer no to any question asked, see options `--no` and
448       `--confirm-level`. OPAMNO is ignored if either OPAMCONFIRMLEVEL or
449       OPAMYES is set.
450
451       OPAMNOAGGREGATE with `opam admin check', don't aggregate packages.
452
453       OPAMNOASPCUD Deprecated.
454
455       OPAMNOAUTOUPGRADE disables automatic internal upgrade of repositories
456       in an earlier format to the current one, on 'update' or 'init'.
457
458       OPAMNOCHECKSUMS enables option --no-checksums when available.
459
460       OPAMNODEPEXTS disables system dependencies handling, see option
461       `--no-depexts'.
462
463       OPAMNOENVNOTICE Internal.
464
465       OPAMNOSELFUPGRADE see option `--no-self-upgrade'
466
467       OPAMPINKINDAUTO sets whether version control systems should be detected
468       when pinning to a local path. Enabled by default since 1.3.0.
469
470       OPAMPRECISETRACKING fine grain tracking of directories.
471
472       OPAMPREPRO set this to false to disable CUDF preprocessing. Less
473       efficient, but might help debugging solver issue.
474
475       OPAMREQUIRECHECKSUMS Enables option `--require-checksums' when
476       available (e.g. for `opam install').
477
478       OPAMRETRIES sets the number of tries before failing downloads.
479
480       OPAMREUSEBUILDDIR see option `--reuse-build-dir'.
481
482       OPAMROOT see option `--root'. This is automatically set by `opam env
483       --root=DIR --set-root'.
484
485       OPAMROOTISOK don't complain when running as root.
486
487       OPAMSAFE see option `--safe'.
488
489       OPAMSHOW see option `--show'.
490
491       OPAMSKIPUPDATE see option `--skip-updates'.
492
493       OPAMSKIPVERSIONCHECKS bypasses some version checks. Unsafe, for
494       compatibility testing only.
495
496       OPAMSOLVERALLOWSUBOPTIMAL (default `true') allows some solvers to still
497       return a solution when they reach timeout; while the solution remains
498       assured to be consistent, there is no guarantee in this case that it
499       fits the expected optimisation criteria. If `true', opam willcontinue
500       with a warning, if `false' a timeout is an error. Currently only the
501       builtin-z3 backend handles this degraded case.
502
503       OPAMSOLVERTIMEOUT change the time allowance of the solver. Default is
504       60.0, set to 0 for unlimited. Note that all solvers may not support
505       this option.
506
507       OPAMSTATS display stats at the end of command.
508
509       OPAMSTATUSLINE display a dynamic status line showing what's currently
510       going on on the terminal. (one of one of `always', `never' or `auto')
511
512       OPAMSTRICT fail on inconsistencies (file reading, switch import, etc.).
513
514       OPAMSWITCH see option `--switch'. Automatically set by `opam env
515       --switch=SWITCH --set-switch'.
516
517       OPAMUNLOCKBASE see install option `--unlock-base'.
518
519       OPAMUPGRADECRITERIA specifies user preferences for dependency solving
520       when performing an upgrade. Overrides OPAMCRITERIA in upgrades if both
521       are set. See also option --criteria.
522
523       OPAMUSEINTERNALSOLVER see option `--use-internal-solver'.
524
525       OPAMUSEOPENSSL force openssl use for hash computing.
526
527       OPAMUTF8 use UTF8 characters in output (one of one of `always', `never'
528       or `auto'). By default `auto', which is determined from the locale).
529
530       OPAMUTF8MSGS use extended UTF8 characters (camels) in opam messages.
531       Implies OPAMUTF8. This is set by default on OSX only.
532
533       OPAMVALIDATIONHOOK if set, uses the `%{hook%}' command to validate an
534       opam repository update.
535
536       OPAMVERBOSE see option `--verbose'.
537
538       OPAMVERSIONLAGPOWER do not use.
539
540       OPAMWITHDOC see install option `--with-doc'.
541
542       OPAMWITHTEST see install option `--with-test.
543
544       OPAMWORKINGDIR see option `--working-dir'.
545
546       OPAMYES see options `--yes' and `--confirm-level`. OPAMYES has has
547       priority over OPAMNO and is ignored if OPAMCONFIRMLEVEL is set.
548
549       OPAMVAR_var overrides the contents of the variable var when
550       substituting `%{var}%` strings in `opam` files.
551
552       OPAMVAR_package_var overrides the contents of the variable package:var
553       when substituting `%{package:var}%` strings in `opam` files.
554

CLI VERSION

556       All scripts and programmatic invocations of opam should use `--cli' in
557       order to ensure that they work seamlessly with future versions of the
558       opam client. Additionally, blog posts or other documentation can
559       benefit, as it prevents information from becoming stale.
560
561       Although opam only supports roots (~/.opam/) for the current version,
562       it does provide backwards compatibility for its command-line interface.
563
564       Since CLI version support was only added in opam 2.1, use OPAMCLI to
565       select 2.0 support (as opam 2.0 will just ignore it), and `--cli=2.1'
566       for 2.1 (or later) versions, since an environment variable controlling
567       the parsing of syntax is brittle. To this end, opam displays a warning
568       if OPAMCLI specifies a valid version other than 2.0, and also if
569       `--cli=2.0' is specified.
570
571       The command-line version is selected by using the `--cli' option or the
572       OPAMCLI environment variable. `--cli' may be specified morethan once,
573       where the last instance takes precedence. OPAMCLI is only inspected if
574       `--cli' is not given.
575

EXIT STATUS

577       As an exception to the following, the `exec' command returns 127 if the
578       command was not found or couldn't be executed, and the command's exit
579       value otherwise.
580
581       0   Success, or true for boolean queries.
582
583       1   False. Returned when a boolean return value is expected, e.g. when
584           running with --check, or for queries like opam lint.
585
586       2   Bad command-line arguments, or command-line arguments pointing to
587           an invalid context (e.g. file not following the expected format).
588
589       5   Not found. You requested something (package, version, repository,
590           etc.) that couldn't be found.
591
592       10  Aborted. The operation required confirmation, which wasn't given.
593
594       15  Could not acquire the locks required for the operation.
595
596       20  There is no solution to the user request. This can be caused by
597           asking to install two incompatible packages, for example.
598
599       30  Error in package definition, or other metadata files. Using
600           --strict raises this error more often.
601
602       31  Package script error. Some package operations were unsuccessful.
603           This may be an error in the packages or an incompatibility with
604           your system. This can be a partial error.
605
606       40  Sync error. Could not fetch some remotes from the network. This can
607           be a partial error.
608
609       50  Configuration error. Opam or system configuration doesn't allow
610           operation, and needs fixing.
611
612       60  Solver failure. The solver failed to return a sound answer. It can
613           be due to a broken external solver, or an error in solver
614           configuration.
615
616       99  Internal error. Something went wrong, likely due to a bug in opam
617           itself.
618
619       130 User interrupt. SIGINT was received, generally due to the user
620           pressing Ctrl-C.
621

FURTHER DOCUMENTATION

623       See https://opam.ocaml.org/doc.
624

AUTHORS

626       Vincent Bernardoff <vb@luminar.eu.org>
627       Raja Boujbel <raja.boujbel@ocamlpro.com>
628       Roberto Di Cosmo <roberto@dicosmo.org>
629       Thomas Gazagnaire <thomas@gazagnaire.org>
630       Louis Gesbert <louis.gesbert@ocamlpro.com>
631       Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr>
632       Anil Madhavapeddy <anil@recoil.org>
633       Guillem Rieu <guillem.rieu@ocamlpro.com>
634       Ralf Treinen <ralf.treinen@pps.jussieu.fr>
635       Frederic Tuong <tuong@users.gforge.inria.fr>
636

BUGS

638       Check bug reports at https://github.com/ocaml/opam/issues.
639
640
641
642Opam 2.1.1                                                     OPAM-INSTALL(1)
Impressum