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+# detect-libc
+
+Node.js module to detect the C standard library (libc) implementation
+family and version in use on a given Linux system.
+
+Provides a value suitable for use with the `LIBC` option of
+[prebuild](https://www.npmjs.com/package/prebuild),
+[prebuild-ci](https://www.npmjs.com/package/prebuild-ci) and
+[prebuild-install](https://www.npmjs.com/package/prebuild-install),
+therefore allowing build and provision of pre-compiled binaries
+for musl-based Linux e.g. Alpine as well as glibc-based.
+
+Currently supports libc detection of `glibc` and `musl`.
+
+## Install
+
+```sh
+npm install detect-libc
+```
+
+## Usage
+
+### API
+
+```js
+const { GLIBC, MUSL, family, version, isNonGlibcLinux } = require('detect-libc');
+```
+
+* `GLIBC` is a String containing the value "glibc" for comparison with `family`.
+* `MUSL` is a String containing the value "musl" for comparison with `family`.
+* `family` is a String representing the system libc family.
+* `version` is a String representing the system libc version number.
+* `isNonGlibcLinux` is a Boolean representing whether the system is a non-glibc Linux, e.g. Alpine.
+
+### detect-libc command line tool
+
+When run on a Linux system with a non-glibc libc,
+the child command will be run with the `LIBC` environment variable
+set to the relevant value.
+
+On all other platforms will run the child command as-is.
+
+The command line feature requires `spawnSync` provided by Node v0.12+.
+
+```sh
+detect-libc child-command
+```
+
+## Integrating with prebuild
+
+```json
+  "scripts": {
+    "install": "detect-libc prebuild-install || node-gyp rebuild",
+    "test": "mocha && detect-libc prebuild-ci"
+  },
+  "dependencies": {
+    "detect-libc": "^1.0.2",
+    "prebuild-install": "^2.2.0"
+  },
+  "devDependencies": {
+    "prebuild": "^6.2.1",
+    "prebuild-ci": "^2.2.3"
+  }
+```
+
+## Licence
+
+Copyright 2017 Lovell Fuller
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at [http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0.html)
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.