Zlib Is Missing Necessary For Building Libxml2 Macos

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Zlib Is Missing Necessary For Building Libxml2 Macos

Railsインストール時にzlib is missing; necessary for building libxml2. No zlib is missing; necessary for building libxml2. extconf.rb failed. Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file.

Nokogiri includes its own updated and patched copies of libxml2 andlibxslt libraries. By default, installation of Nokogiri will usethese copies. Alternatively, you may install using your operating system'sbuilt-in libraries or other custom versions of these libraries.

This document also helps with common problems we've heard. If you have anissue not discussed here, pleaseopen an issue.

For earlier versions of Nokogiri, find instructions inthe git history for this document.

For other platforms, please send pull requests to sparklemotion/nokogiri.org-tutorials.

Install with included libraries (RECOMMENDED)¶

Ubuntu / Debian¶

Install Nokogiri on a brand new Ubuntu system with these commands:

Note for RVM users: you may require libgmp, consider running sudo apt-get install libgmp-dev.

FreeBSD / OpenBSD >= 6.2¶

Install Nokogiri on a brand new FreeBSD system with these commands:

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OpenBSD < 6.2¶

Use gcc from ports in order to compile the included libraries:

Windows¶

Precompiled Gems¶

If you're using RubyInstaller to install Ruby, then you can install Nokogiri's pre-compiled gem to avoid having to install a compiler toolchain:

Note that gem will download and use a version of the gem appropriate for your system and architecture (e.g., x64-mingw32, x86-mingw32, etc.).

Compiling From Source¶

Nokogiri source gems can also be compiled and installed using RubyInstaller plus Devkit. This might be necessary if the binary gem doesn't work with your ruby version. (However, if a brand new Ruby version has just come out, give the maintainers a week or so to cut a compatible version of the gem!)

Install Nokogiri by compiling the vendored libxml/libxslt libraries:

Alternatively, install Nokogiri by linking to MSYS2 system libraries:

Fedora, Red Hat, and CentOS¶

Install Nokogiri on a brand new Fedora, Red Hat, or CentOS system with these commands:

Alternatively, you may install the appropriate epel-release and get theNokogiri package from EPEL using:

GNU Guix¶

Install on any Linux distribution using GNU Guix,a reproducible binary software package management and distribution system.

Use this command:

Note: source code is available here. A short description of how Nokogiri was packaged can be foundhere.

Ruby on Alpine Linux (Docker)¶

The official ruby-alpine Docker images arestripped of their development tools to minimize size. To install nokogiri (orother gems with native extensions) you'll need to install build tools again viathe build-base meta-package(which includes gcc and other necessities).

Zlib Is Missing Necessary For Building Libxml2 Macos 7

TermUX¶

Although TermUX isn't fully supported right now, some people have reported success getting Nokogiri installed on it by running these commands:

macOS¶

First, make sure you have the latest version of RubyGems and xcode commandline tools:

Agree to the Xcode license:

Then install nokogiri:

This is verified working on maxOS 10.9 w/ Xcode's clang compiler. (Many thanks to @allaire and others for helping!)

xcode-select errors with a 'network problem'¶

If, you see this dialog when you run the above commands:

Then run this command to turn off forced-authentication with Apple SoftwareUpdate:

Error Message About Undeclared Identifier LZMA_OK

A more recent error mentions an undeclared identifier LZMA_OK:

The solution for this is a little more subtle and can be fixed in a couple ofways.

  1. When using Homebrew, there are several libraries that use a formula called xz (including the_silver_searcher and imagemagick), which by default install a version of liblzma that is incompatible with most Ruby builds. (Homebrew installs only the 64-bit version of the library, but most Ruby builds are universal.) This can be fixed in a couple of ways:

    a. The most reliable way appears to be temporarily unlinking xz and relinking it during an install of nokogiri:

    b. The third way is to use a Homebrew-installed libxml2, as suggested in using your system libraries.

Unable to find libraries on macOS Mojave¶

Xcode 10 on macOS Mojave moves the system headers out of /usr/includeand so Nokogiri will fail to build. Instead you'll see an error similar to this:

A temporary workaround to allow previous releases of Nokogiri to build is toinstall the extra headers package mentioned in the Xcode 10 release notes:

You can also install the headers package from the command line (e.g. for a build script or a CI server):

Other macOS Tips¶

  • Make sure ruby is compiled with the latest clang compiler.
  • Binary gems and ruby should be compiled with the same compiler/environment.
  • If you have multiple versions of Xcode installed, make sure you use the right xcode-select.
  • Try installing with system libraries.

If reporting an issue about the macOS installation instructions, please mention @zenspider.

Install with system libraries¶

Nokogiri will refuse to build against certain versions of libxml2, libxsltsupplied with your operating system, and certain versions will cause mysteriousproblems. The compile scripts will warn you if you try to do this.

Step 1: Install pkg-config

On Debian/Ubuntu:

Zlib Is Missing Necessary For Building Libxml2 Macos 1

On FreeBSD:

Step 2: Build Nokogiri¶

Using gem:

Or, use Bundler:

Install with custom / non-standard libraries¶

If:

  • you've got libxml2 and/or libxslt installed in a nonstandard place,
  • and you don't have pkg-config installed

you can use command-line parameters to the gem install command tospecify build parameters. https://windowsomg.netlify.app/java-for-mac-yosemite-10105.html.

If you've got the proper config scripts:

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or, you can specify the installation root directory:

or, you can specify include and library directories separately:

Note: By default, libxslt header files are installed into theroot include directory, but libxml2 header files are installed into asubdirectory thereof named libxml2.

It's likely that you'll also need to specify the location of yourzlib and iconv (and possibly exslt) install directories aswell. In that case, you can add the options:

How to tell Bundler to use custom parameters¶

Do not attempt Bundler installation using Bundler versions before v1.8.3.See bundler/bundler#3053. But if you really want to,see earlier git history of this file, which includes a workaround.

Ruby on Alpine Linux (Docker)¶

To compile against Alpine's own XML libraries, add the necessarydevelopment tools and libraries to the image.

When optimizing the size of an Alpine image, the runtime librariesmust be permanently added. Additionally, adding and removingdevelopment tooling can be chained with gem installation to ensure asmall layer.

This approach nets an 12.1 MB layer (versus 18.1 MB without --use-system-libraries)and saves over 170 MB in build tools.

SmartOS (Nonstandard)¶

SmartOS installation requires building and usinglibxml2/libxslt/libiconv in a nonstandard location. Building on theprevious section, here's how to do it:

(Note: pkgsrc is included in JPC SmartOS instances)

See the previous section for guidance on how to instruct Bundler touse these options.

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Creating a zlib/libzip compression library for CNTK

We use the following installation paths in our instructions:

  • libzip sources: c:localsrclibzip-1.1.3
  • zlib sources: c:localsrczlibzlib-1.2.8
  • Build directory for zlib and libzip binaries: c:localzlib-vs15

You can use any paths you like, but note the remark on target folder for binaries below.

  • Install CMake. Include CMake binaries folder to your PATH
  • Download libzip source code and unpack to c:localsrclibzip-1.1.3
  • Download zlib source code and unpack it to c:localsrczlibzlib-1.2.8

There are two ways to build the lib/libzip compression library for CNTK, either through a batch file or manually.

Building through a batch file

In the directory ToolsdevInstallWindows you find the batch file buildZlibVS15.bat. This batch file takes three parameters to build the CNTK Protobuf library. The first parameter is the directory of the libzip source files you unpacked above, the second parameter is the directory of the zlib source files,the third parameter is the destination directory for the created library. In our case follow these steps from a standard Windows command prompt:

Set the environment variable ZLIB_PATH to the location of the created library (this is the third parameter in the command invocation above, not the sources location!

Manual build steps for a CNTK compression library

The following aspects are important:

  • Build commands for zlib and libzip should use the same target folder for binaries (specified via -DCMAKE_INSTALL_PREFIX parameter in cmake command below)
  • Build order is important. You should build zlib first because libzip is dependent on it

Command prompt environment for build

Launch a 64-bit Visual Studio 2015 development environment. The most convenient way is to execute the batch file vcvarsall.bat in the Visual Studio directory with the required parameters from a standard windows command shell:

If you can't find this batch file on your system, please revisit the installation of VS2015, and make sure you have the 'Common Tools for Visual C++ 2015' option selected.

Building zlib

Execute the following commands from VS2015 x64 Native Tools Command Prompt:

Building libzip

Nokogiri Zlib Is Missing Necessary For Building Libxml2

Execute the following commands from VS2015 x64 Native Tools Command Prompt:

MSBuild command above may generate some warnings. It is expected and may be ignored.

The last cmake command from the list above will generate the following error:

Zlib Is Missing Necessary For Building Libxml2 *** Extconf.rb Failed ***

It is expected and may be ignored - all required binaries (zip.dll and zlib.dll) should be already in c:localzlib-vs15

Zlib Is Missing Necessary For Building Libxml2 Ubuntu

Preparing the environment

Set the following environment variable: