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When using `node-gyp` you might see an error like this when attempting to compile/install a node.js native addon:
```
$ npm install bcrypt
npm http GET https://registry.npmjs.org/bcrypt/0.7.5
npm http 304 https://registry.npmjs.org/bcrypt/0.7.5
npm http GET https://registry.npmjs.org/bindings/1.0.0
npm http 304 https://registry.npmjs.org/bindings/1.0.0
> bcrypt@0.7.5 install /home/ubuntu/public/song-swap/node_modules/bcrypt
> node-gyp rebuild
gyp ERR! configure error
gyp ERR! stack Error: "pre" versions of node cannot be installed, use the --nodedir flag instead
gyp ERR! stack at install (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/install.js:69:16)
gyp ERR! stack at Object.self.commands.(anonymous function) [as install] (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/node-gyp.js:56:37)
gyp ERR! stack at getNodeDir (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:219:20)
gyp ERR! stack at /usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:105:9
gyp ERR! stack at ChildProcess.exithandler (child_process.js:630:7)
gyp ERR! stack at ChildProcess.EventEmitter.emit (events.js:99:17)
gyp ERR! stack at maybeClose (child_process.js:730:16)
gyp ERR! stack at Process.ChildProcess._handle.onexit (child_process.js:797:5)
gyp ERR! System Linux 3.5.0-21-generic
gyp ERR! command "node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /home/ubuntu/public/song-swap/node_modules/bcrypt
gyp ERR! node -v v0.11.2-pre
gyp ERR! node-gyp -v v0.9.5
gyp ERR! not ok
npm ERR! bcrypt@0.7.5 install: `node-gyp rebuild`
npm ERR! `sh "-c" "node-gyp rebuild"` failed with 1
npm ERR!
npm ERR! Failed at the bcrypt@0.7.5 install script.
npm ERR! This is most likely a problem with the bcrypt package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node-gyp rebuild
npm ERR! You can get their info via:
npm ERR! npm owner ls bcrypt
npm ERR! There is likely additional logging output above.
npm ERR! System Linux 3.5.0-21-generic
npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "install" "bcrypt"
npm ERR! cwd /home/ubuntu/public/song-swap
npm ERR! node -v v0.11.2-pre
npm ERR! npm -v 1.2.18
npm ERR! code ELIFECYCLE
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /home/ubuntu/public/song-swap/npm-debug.log
npm ERR! not ok code 0
```
The main error here is:
```
Error: "pre" versions of node cannot be installed, use the --nodedir flag instead
```
This error is caused when you attempt to compile a native addon using a version of node.js with `-pre` at the end of the version number:
``` bash
$ node -v
v0.10.4-pre
```
## How to avoid (the short answer)
To avoid this error completely just use a stable release of node.js. i.e. `v0.10.4`, and __not__ `v0.10.4-pre`.
## How to fix (the long answer)
This error happens because `node-gyp` does not know what header files were used to compile your "pre" version of node, and therefore it needs you to specify the node source code directory path using the `--nodedir` flag.
For example, if I compiled my development ("pre") version of node.js using the source code in `/Users/nrajlich/node`, then I could invoke `node-gyp` like:
``` bash
$ node-gyp rebuild --nodedir=/Users/nrajlich/node
```
Or install an native addon through `npm` like:
``` bash
$ npm install bcrypt --nodedir=/Users/nrajlich/node
```
### Always use `--nodedir`
__Note:__ This is for advanced users who use `-pre` versions of node more often than tagged releases.
If you're invoking `node-gyp` through `npm`, then you can leverage `npm`'s configuration system and not have to specify the `--nodedir` flag all the time:
``` bash
$ npm config set nodedir /Users/nrajlich/node
```

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# Force npm to use global installed node-gyp
**Note: These instructions only work with npm 6 or older. For a solution that works with npm 8 (or older), see [Updating-npm-bundled-node-gyp.md](Updating-npm-bundled-node-gyp.md).**
[Many issues](https://github.com/nodejs/node-gyp/labels/ERR%21%20node-gyp%20-v%20%3C%3D%20v5.1.0) are opened by users who are
not running a [current version of node-gyp](https://github.com/nodejs/node-gyp/releases).
npm bundles its own, internal, copy of node-gyp located at `npm/node_modules`, within npm's private dependencies which are separate from *globally* accessible packages. Therefore this internal copy of node-gyp is independent from any globally installed copy of node-gyp that
may have been installed via `npm install -g node-gyp`.
So npm's internal copy of node-gyp **isn't** stored inside *global* `node_modules` and thus isn't available for use as a standalone package. npm uses it's *internal* copy of `node-gyp` to automatically build native addons.
When you install a _new_ version of node-gyp outside of npm, it'll go into your *global* `node_modules`, but not under the `npm/node_modules` (where internal copy of node-gyp is stored). So it will get into your `$PATH` and you will be able to use this globally installed version (**but not internal node-gyp of npm**) as any other globally installed package.
The catch is that npm **won't** use global version unless you tell it to, it'll keep on using the **internal one**. You need to instruct it to by setting the `node_gyp` config variable (which goes into your `~/.npmrc`). You do this by running the `npm config set` command as below. Then npm will use the command in the path you supply whenever it needs to build a native addon.
**Important**: You also need to remember to unset this when you upgrade npm with a newer version of node-gyp, or you have to manually keep your globally installed node-gyp to date. See "Undo" below.
## Linux and macOS
```
npm install --global node-gyp@latest
npm config set node_gyp $(npm prefix -g)/lib/node_modules/node-gyp/bin/node-gyp.js
```
`sudo` may be required for the first command if you get a permission error.
## Windows
### Windows Command Prompt
```
npm install --global node-gyp@latest
for /f "delims=" %P in ('npm prefix -g') do npm config set node_gyp "%P\node_modules\node-gyp\bin\node-gyp.js"
```
### Powershell
```
npm install --global node-gyp@latest
npm prefix -g | % {npm config set node_gyp "$_\node_modules\node-gyp\bin\node-gyp.js"}
```
## Undo
**Beware** if you don't unset the `node_gyp` config option, npm will continue to use the globally installed version of node-gyp rather than the one it ships with, which may end up being newer.
```
npm config delete node_gyp
npm uninstall --global node-gyp
```

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Welcome to the node-gyp wiki!
* [["binding.gyp" files out in the wild]]
* [[Linking to OpenSSL]]
* [[Common Issues]]
* [[Updating npm's bundled node-gyp]]
* [[Error: "pre" versions of node cannot be installed]]

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A handful of native addons require linking to OpenSSL in one way or another. This introduces a small challenge since node will sometimes bundle OpenSSL statically (the default for node >= v0.8.x), or sometimes dynamically link to the system OpenSSL (default for node <= v0.6.x).
Good native addons should account for both scenarios. It's recommended that you use the `binding.gyp` file provided below as a starting-point for any addon that needs to use OpenSSL:
``` python
{
'variables': {
# node v0.6.x doesn't give us its build variables,
# but on Unix it was only possible to use the system OpenSSL library,
# so default the variable to "true", v0.8.x node and up will overwrite it.
'node_shared_openssl%': 'true'
},
'targets': [
{
'target_name': 'binding',
'sources': [
'src/binding.cc'
],
'conditions': [
['node_shared_openssl=="false"', {
# so when "node_shared_openssl" is "false", then OpenSSL has been
# bundled into the node executable. So we need to include the same
# header files that were used when building node.
'include_dirs': [
'<(node_root_dir)/deps/openssl/openssl/include'
],
"conditions" : [
["target_arch=='ia32'", {
"include_dirs": [ "<(node_root_dir)/deps/openssl/config/piii" ]
}],
["target_arch=='x64'", {
"include_dirs": [ "<(node_root_dir)/deps/openssl/config/k8" ]
}],
["target_arch=='arm'", {
"include_dirs": [ "<(node_root_dir)/deps/openssl/config/arm" ]
}]
]
}]
]
}
]
}
```
This ensures that when OpenSSL is statically linked into `node` then, the bundled OpenSSL headers are included, but when the system OpenSSL is in use, then only those headers will be used.
## Windows?
As you can see this baseline `binding.gyp` file only accounts for the Unix scenario. Currently on Windows the situation is a little less ideal. On Windows, OpenSSL is _always_ statically compiled into the `node` executable, so ideally it would be possible to use that copy of OpenSSL when building native addons.
Unfortunately it doesn't seem like that is possible at the moment, as there would need to be tweaks made to the generated `node.lib` file to include the openssl glue functions, or a new `openssl.lib` file would need to be created during the node build. I'm not sure which is the easiest/most feasible.
In the meantime, one possible solution is using another copy of OpenSSL, which is what [`node-bcrypt`](https://github.com/ncb000gt/node.bcrypt.js) currently does. Adding something like this to your `binding.gyp` file's `"conditions"` block would enable this:
``` python
[ 'OS=="win"', {
'conditions': [
# "openssl_root" is the directory on Windows of the OpenSSL files.
# Check the "target_arch" variable to set good default values for
# both 64-bit and 32-bit builds of the module.
['target_arch=="x64"', {
'variables': {
'openssl_root%': 'C:/OpenSSL-Win64'
},
}, {
'variables': {
'openssl_root%': 'C:/OpenSSL-Win32'
},
}],
],
'libraries': [
'-l<(openssl_root)/lib/libeay32.lib',
],
'include_dirs': [
'<(openssl_root)/include',
],
}]
```
Now you can direct your users to install OpenSSL on Windows from here (be sure to tell them to install the 64-bit version if they're compiling against a 64-bit version of node): http://slproweb.com/products/Win32OpenSSL.html
Also note that both `node-gyp` and `npm` allow you to overwrite that default `openssl_root` variable on the command line:
``` bash
$ node-gyp rebuild --openssl-root="C:\Users\Nathan\Desktop\openssl"
```

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## Versions of `node-gyp` that are earlier than v9.x.x
Please look thru your error log for the string `gyp info using node-gyp@` and if that version number is less than the [current release of node-gyp](https://github.com/nodejs/node-gyp/releases) then __please upgrade__ using [these instructions](https://github.com/nodejs/node-gyp/blob/master/docs/Updating-npm-bundled-node-gyp.md) and then try your command again.
## `node-sass` is deprecated
Please be aware that the package [`node-sass` is deprecated](https://github.com/sass/node-sass#node-sass) so you should actively seek alternatives. Please avoid opening new `node-sass` issues on this repo. You can try `npm install --global node-sass@latest` but we [cannot help much](https://github.com/nodejs/node-gyp/issues?q=is%3Aissue+label%3A%22Node+Sass+--%3E+Dart+Sass%22+) here.
## Issues finding the installed Visual Studio
In cmd, [`npm config set msvs_version 20xx`](https://github.com/nodejs/node-gyp#on-windows) with ___xx___ matching your locally installed version of Visual Studio.

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# Updating the npm-bundled version of node-gyp
**Note: These instructions are (only) tested and known to work with npm 8 and older.**
**Note: These instructions will be undone if you reinstall or upgrade npm or node! For a more permanent (and simpler) solution, see [Force-npm-to-use-global-node-gyp.md](Force-npm-to-use-global-node-gyp.md). (npm 6 or older only!)**
[Many issues](https://github.com/nodejs/node-gyp/issues?q=label%3A"ERR!+node-gyp+-v+<%3D+v9.x.x") are opened by users who are
not running a [current version of node-gyp](https://github.com/nodejs/node-gyp/releases).
`npm` bundles its own, internal, copy of `node-gyp`. This internal copy is independent of any globally installed copy of node-gyp that
may have been installed via `npm install -g node-gyp`.
This means that while `node-gyp` doesn't get installed into your `$PATH` by default, npm still keeps its own copy to invoke when you
attempt to `npm install` a native add-on.
Sometimes, you may need to update npm's internal node-gyp to a newer version than what is installed. A simple `npm install -g node-gyp`
_won't_ do the trick since npm will still continue to use its internal copy over the global one.
So instead:
## Version of npm
We need to start by knowing your version of `npm`:
```bash
npm --version
```
## Linux, macOS, Solaris, etc.
Unix is easy. Just run the following command.
If your npm is version ___7 or 8___, do:
```bash
$ npm explore npm/node_modules/@npmcli/run-script -g -- npm_config_global=false npm install node-gyp@latest
```
Else if your npm is version ___less than 7___, do:
```bash
$ npm explore npm/node_modules/npm-lifecycle -g -- npm install node-gyp@latest
```
If the command fails with a permissions error, please try `sudo` and then the command.
## Windows
Windows is a bit trickier, since `npm` might be installed to the "Program Files" directory, which needs admin privileges in order to
modify on current Windows. Therefore, run the following commands __inside a `cmd.exe` started with "Run as Administrator"__:
First we need to find the location of `node`. If you don't already know the location that `node.exe` got installed to, then run:
```bash
$ where node
```
Now `cd` to the directory that `node.exe` is contained in e.g.:
```bash
$ cd "C:\Program Files\nodejs"
```
If your npm version is ___7 or 8___, do:
```bash
cd node_modules\npm\node_modules\@npmcli\run-script
```
Else if your npm version is ___less than 7___, do:
```bash
cd node_modules\npm\node_modules\npm-lifecycle
```
Finish by running:
```bash
$ npm install node-gyp@latest
```

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This page contains links to some examples of existing `binding.gyp` files that other node modules are using. Take a look at them for inspiration.
To add to this page, just add the link to the project's `binding.gyp` file below:
* [ons](https://github.com/XadillaX/aliyun-ons/blob/master/binding.gyp)
* [thmclrx](https://github.com/XadillaX/thmclrx/blob/master/binding.gyp)
* [libxmljs](https://github.com/polotek/libxmljs/blob/master/binding.gyp)
* [node-buffertools](https://github.com/bnoordhuis/node-buffertools/blob/master/binding.gyp)
* [node-canvas](https://github.com/LearnBoost/node-canvas/blob/master/binding.gyp)
* [node-ffi](https://github.com/rbranson/node-ffi/blob/master/binding.gyp) + [libffi](https://github.com/rbranson/node-ffi/blob/master/deps/libffi/libffi.gyp)
* [node-time](https://github.com/TooTallNate/node-time/blob/master/binding.gyp)
* [node-sass](https://github.com/sass/node-sass/blob/master/binding.gyp) + [libsass](https://github.com/sass/node-sass/blob/master/src/libsass.gyp)
* [node-serialport](https://github.com/voodootikigod/node-serialport/blob/master/binding.gyp)
* [node-weak](https://github.com/TooTallNate/node-weak/blob/master/binding.gyp)
* [pty.js](https://github.com/chjj/pty.js/blob/master/binding.gyp)
* [ref](https://github.com/TooTallNate/ref/blob/master/binding.gyp)
* [appjs](https://github.com/milani/appjs/blob/master/binding.gyp)
* [nwm](https://github.com/mixu/nwm/blob/master/binding.gyp)
* [bcrypt](https://github.com/ncb000gt/node.bcrypt.js/blob/master/binding.gyp)
* [nk-mysql](https://github.com/mmod/nodamysql/blob/master/binding.gyp)
* [nk-xrm-installer](https://github.com/mmod/nk-xrm-installer/blob/master/binding.gyp) + [includable.gypi](https://github.com/mmod/nk-xrm-installer/blob/master/includable.gypi) + [unpack.py](https://github.com/mmod/nk-xrm-installer/blob/master/unpack.py) + [disburse.py](https://github.com/mmod/nk-xrm-installer/blob/master/disburse.py)
<sub>.py files above provide complete reference for examples of fetching source via http, extracting, and moving files.</sub>
* [node-memwatch](https://github.com/lloyd/node-memwatch/blob/master/binding.gyp)
* [node-ip2location](https://github.com/bolgovr/node-ip2location/blob/master/binding.gyp)
* [node-midi](https://github.com/justinlatimer/node-midi/blob/master/binding.gyp)
* [node-sqlite3](https://github.com/developmentseed/node-sqlite3/blob/master/binding.gyp) + [libsqlite3](https://github.com/developmentseed/node-sqlite3/blob/master/deps/sqlite3.gyp)
* [node-zipfile](https://github.com/mapbox/node-zipfile/blob/master/binding.gyp)
* [node-mapnik](https://github.com/mapnik/node-mapnik/blob/master/binding.gyp)
* [node-inotify](https://github.com/c4milo/node-inotify/blob/master/binding.gyp)
* [v8-profiler](https://github.com/c4milo/v8-profiler/blob/master/binding.gyp)
* [airtunes](https://github.com/radioline/node_airtunes/blob/master/binding.gyp)
* [node-fann](https://github.com/c4milo/node-fann/blob/master/binding.gyp)
* [node-talib](https://github.com/oransel/node-talib/blob/master/binding.gyp)
* [node-leveldown](https://github.com/rvagg/node-leveldown/blob/master/binding.gyp) + [leveldb.gyp](https://github.com/rvagg/node-leveldown/blob/master/deps/leveldb/leveldb.gyp) + [snappy.gyp](https://github.com/rvagg/node-leveldown/blob/master/deps/snappy/snappy.gyp)
* [node-expat](https://github.com/astro/node-expat/blob/master/binding.gyp) + [libexpat](https://github.com/astro/node-expat/blob/master/deps/libexpat/libexpat.gyp)
* [node-openvg-canvas](https://github.com/luismreis/node-openvg-canvas/blob/master/binding.gyp) + [node-openvg](https://github.com/luismreis/node-openvg/blob/master/binding.gyp)
* [node-cryptopp](https://github.com/BatikhSouri/node-cryptopp/blob/master/binding.gyp)
* [topcube](https://github.com/creationix/topcube/blob/master/binding.gyp)
* [node-osmium](https://github.com/osmcode/node-osmium/blob/master/binding.gyp)
* [node-osrm](https://github.com/DennisOSRM/node-osrm)
* [node-oracle](https://github.com/joeferner/node-oracle/blob/master/binding.gyp)
* [node-process-list](https://github.com/ReklatsMasters/node-process-list/blob/master/binding.gyp)
* [node-nanomsg](https://github.com/nickdesaulniers/node-nanomsg/blob/master/binding.gyp)
* [Ghostscript4JS](https://github.com/NickNaso/ghostscript4js/blob/master/binding.gyp)
* [nodecv](https://github.com/xudafeng/nodecv/blob/master/binding.gyp)
* [magick-cli](https://github.com/NickNaso/magick-cli/blob/master/binding.gyp)
* [sharp](https://github.com/lovell/sharp/blob/master/binding.gyp)
* [krb5](https://github.com/adaltas/node-krb5/blob/master/binding.gyp)
* [node-heapdump](https://github.com/bnoordhuis/node-heapdump/blob/master/binding.gyp)