These scripts are used to build the "official" libjpeg-turbo binaries, which work on any Linux platform with GLIBC 2.17 and later, as well as Windows XP and later and OS X/macOS 10.7 and later.
See BUILDING.md in the libjpeg-turbo source for basic build requirements. Additional build requirements for these scripts are listed below.
Recommended distro: Red Hat or CentOS Enterprise Linux 7 x86-64
Complete Linux build environment requirements are best understood by examining the official Docker recipe at https://github.com/libjpeg-turbo/docker.
macOS 10.15 (Catalina) or later required
CMake should be installed somewhere in the PATH. The version in MacPorts
(http://www.MacPorts.org) works, or just install the CMake application from
the DMG (http://www.cmake.org) and add
/Applications/CMake.app/Contents/bin to the PATH.
Xcode 12.0 or later (available at https://developer.apple.com/downloads -- Apple ID required.)
Oracle JDK or OpenJDK
Windows XP 64-bit or later required
CMake (the Windows native version, not the Cygwin version) should be installed
somewhere in the PATH.
Ninja should be installed somewhere in the PATH.
The directory containing the 64-bit Visual C++ compiler should be listed in the
PATH environment variable. The directory containing the 64-bit Windows SDK
libraries should be listed in the LIB environment variable. The directories
containing the Visual C++ and Windows SDK header files should be listed in the
INCLUDE environment variable. The easiest way to accomplish this is to use
the vcvars64.bat script provided by Visual C++, as described in the
libjpeg-turbo build instructions.
The official libjpeg-turbo binaries for Visual C++ are generated using Visual Studio 2015 Community Edition, but any reasonably modern version of Visual C++ and the Windows SDK should work. Note, however, that jpegXX.dll will depend on the C run-time DLLs from whichever version of Visual C++ was used to build it.
The Windows native builds (both Visual C++ and MinGW) must be conducted from
within an MSYS shell. The easiest way to do that is to install
MSYS2 and then use its built-in package manager
(pacman) to install the make package.
In order for the libjpeg-turbo static libraries to be compatible with a wide variety of MinGW distributions, it is necessary to build libjpeg-turbo using specific versions of the MinGW toolchain. Use the MinGW-builds installer to install the following toolchain versions into their default directories:
- Version 6.4.0 / x86_64 / POSIX threads / SEH exception handling / Rev. 0
- Version 6.4.0 / i686 / POSIX threads / DWARF exception handling / Rev. 0
Both 64-bit and 32-bit JDKs should be installed, but they do not need to be
added to the PATH. You do, however, need to create a symbolic link to the
32-bit JRE so that the build scripts can find it.
From an Administrator Command Prompt, type:
mklink /d %ProgramData%\Oracle\Java\Java32 {directory of 32-bit JRE}
Install all other software necessary to build a 32-bit and a 64-bit version of libjpeg-turbo (refer to BUILDING.md.)
Executing
buildljt [branch/tag]
(where branch/tag is, for instance, "1.4.x" and defaults to "main") will generate both a pristine source tarball and binaries for the platform on which the script is executed. These are placed under $HOME/src/ljt.nightly/YYYYMMDD/files, where YYYYMMDD is a build number based on today's date. If the build is successful, then a sym link will be created from $HOME/src/ljt.nightly/latest to $HOME/src/ljt.nightly/YYYYMMDD.
Once a full build is completed on one platform, then you can use the existing
source tarball to build binaries on other platforms by running buildljt -e
(assuming that $HOME/src is a shared directory.)
NOTE: On Windows, buildljt should be run from inside an MSYS shell. If you
are mounting your home directory as a drive letter (e.g. H:), then set the
HOME environment variable to the MinGW path for that drive (e.g. /h)
prior to running buildljt.
Run buildljt -h for usage information.
To sign the RPMs and DEBs using a GPG key, create a file called gpgsign in the same directory as buildljt, and include the following contents in the file:
GPG_KEY_NAME={full name of GPG key to use (as listed in 'gpg --list-keys')}
GPG_KEY_ID={key ID of GPG key to use (as listed in 'gpg --list-keys')}
GPG_KEY_PASS={password for GPG key}
debsigs must be installed and in the
PATH.
To sign the Mac installer package and DMG, create a file called macsign under setupscripts/, and include the following contents in the file:
MACOS_APP_CERT_NAME={full name of Mac Developer ID Application certficate (in the macOS keychain) used to sign the DMG}
MACOS_INST_CERT_NAME={full name of Mac Developer ID Installer certificate (in the macOS keychain) used to sign the installer package}
macOS 10.11 "El Capitan" or later is required in order to sign the Mac package/DMG.
To sign the Windows installers using a code signing certificate, create a file called mssign in the same directory as buildljt, and include the following contents in the file:
MS_KEY_FILE={full MinGW path to a .pfx file containing the code signing certificate}
MS_KEY_PASS={password for certificate}
signtool (available in the Windows SDK) must be in the PATH.