OpenJDK

OpenJDK Build README

Introduction

This README file contains build instructions for the OpenJDK. Building the source code for the OpenJDK requires a certain degree of technical expertise.

Contents

Minimum Build Environments

This file often describes specific requirements for what we call the "minimum build environments" (MBE) for this specific release of the JDK, Building with the MBE will generate the most compatible bits that install on, and run correctly on, the most variations of the same base OS and hardware architecture. These usually represent what is often called the least common denominator platforms. It is understood that most developers will NOT be using these specific platforms, and in fact creating these specific platforms may be difficult due to the age of some of this software.

The minimum OS and C/C++ compiler versions needed for building the OpenJDK:

Base OS and Architecture OS C/C++ Compiler
Linux X86 (32-bit) Fedora 9 gcc 4
Linux X64 (64-bit) Fedora 9 gcc 4
Solaris SPARC (32-bit) Solaris 10 + patches
See SunSolve for patch downloads. 		Sun Studio 12
Solaris SPARCV9 (64-bit) Solaris 10 + patches
See SunSolve for patch downloads. 		Sun Studio 12
Solaris X86 (32-bit) Solaris 10 + patches
See SunSolve for patch downloads. 		Sun Studio 12
Solaris X64 (64-bit) Solaris 10 + patches
See SunSolve for patch downloads. 		Sun Studio 12
Windows X86 (32-bit) Windows XP Microsoft Visual Studio C++ 2008 Standard Edition
Windows X64 (64-bit) Windows Server 2003 - Enterprise x64 Edition Microsoft Platform SDK - April 2005

These same sources do indeed build on many more systems than the above older generation systems, again the above is just a minimum.

Compilation problems with newer or different C/C++ compilers is a common problem. Similarly, compilation problems related to changes to the /usr/include or system header files is also a common problem with newer or unreleased OS versions. Please report these types of problems as bugs so that they can be dealt with accordingly.

Specific Developer Build Environments

We won't be listing all the possible environments, but we will try to provide what information we have available to us.

Fedora 9

After installing Fedora 9 you need to make sure you have the "Software Development" bundle installed, plus the following packages:

Always a good idea to do a complete Software Update/Refresh after you get all the packages installed.

CentOS 5.2

After installing CentOS 5.2 you need to make sure you have the following Development bundles installed:

Plus the following packages:

The freetype 2.3 packages don't seem to be available, but the freetype 2.3 sources can be downloaded, built, and installed easily enough from the freetype site. Build and install with something like:

./configure && make && sudo -u root make install

Mercurial packages could not be found easily, but a Google search should find ones, and they usually include Python if it's needed.

Ubuntu

In addition to needing the Bootstrap JDK and the Binary Plugs, when building on Ubuntu you will need to make sure certain packages are installed. In particular, certain X11 packages, make, m4, gawk, gcc 4, binutils, cups, freetype and alsa.

Ubuntu 6.06

The following list of packages for Ubuntu 6.06 is a working set that does appear to work.

Note that it's quite possible that some of these packages are not required, so anyone discovering that some of the packages listed below are NOT required, please let the OpenJDK team know.

All the packages below can be installed with the Synaptic Package manager provided with the base Ubuntu 6.06 release.

Ubuntu 7.04

Using the Synaptic Package Manager, download the following packages (double indented packages are automatically aquired due to package dependencies):

Source Directory Structure

The source code for the OpenJDK is delivered in a set of directories: hotspot, langtools, corba, jaxws, jaxp, and jdk. The hotspot directory contains the source code and make files for building the OpenJDK Hotspot Virtual Machine. The langtools directory contains the source code and make files for building the OpenJDK javac and language tools. The corba directory contains the source code and make files for building the OpenJDK Corba files. The jaxws directory contains the source code and make files for building the OpenJDK JAXWS files. The jaxp directory contains the source code and make files for building the OpenJDK JAXP files. The jdk directory contains the source code and make files for building the OpenJDK runtime libraries and misc files. The top level Makefile is used to build the entire OpenJDK.

Build Information

Building the OpenJDK is done with a gmake command line and various environment or make variable settings that direct the make rules to where various components have been installed. Where possible the makefiles will attempt to located the various components in the default locations or any component specific variable settings. When the normal defaults fail or components cannot be found, the various ALT_* variables (alternates) can be used to help the makefiles locate components.

Refer to the bash/sh/ksh setup file jdk/make/jdk_generic_profile.sh if you need help in setting up your environment variables. A build could be as simple as: 


                bash
                . jdk/make/jdk_generic_profile.sh
                gmake sanity && gmake

Of course ksh or sh would work too. But some customization will probably be necessary. The sanity rule will make some basic checks on build dependencies and generate appropriate warning messages regarding missing, out of date, or newer than expected components found on your system.

GNU make (gmake)

The Makefiles in the OpenJDK are only valid when used with the GNU version of the utility command make (gmake). A few notes about using GNU make:

Information on GNU make, and access to ftp download sites, are available on the GNU make web site . The latest source to GNU make is available at ftp.gnu.org/pub/gnu/make/.

Basic Linux System Setup

i586 only: The minimum recommended hardware for building the Linux version is a Pentium class processor or better, at least 256 MB of RAM, and approximately 1.5 GB of free disk space.

X64 only: The minimum recommended hardware for building the Linux version is an AMD Opteron class processor, at least 512 MB of RAM, and approximately 4 GB of free disk space.

The build will use the tools contained in /bin and /usr/bin of a standard installation of the Linux operating environment. You should ensure that these directories are in your PATH.

Note that some Linux systems have a habit of pre-populating your environment variables for you, for example JAVA_HOME might get pre-defined for you to refer to the JDK installed on your Linux system. You will need to unset JAVA_HOME. It's a good idea to run env and verify the environment variables you are getting from the default system settings make sense for building the OpenJDK.

Basic Linux Check List

  1. Install the Bootstrap JDK, set ALT_BOOTDIR.
  2. Install the Binary Plugs, set ALT_BINARY_PLUGS_PATH.
  3. Optional Import JDK, set ALT_JDK_IMPORT_PATH.
  4. Install or upgrade the FreeType development package.
  5. Install Ant, make sure it is in your PATH.

Basic Solaris System Setup

The minimum recommended hardware for building the Solaris SPARC version is an UltraSPARC with 512 MB of RAM. For building the Solaris x86 version, a Pentium class processor or better and at least 512 MB of RAM are recommended. Approximately 1.4 GB of free disk space is needed for a 32-bit build.

If you are building the 64-bit version, you should run the command "isainfo -v" to verify that you have a 64-bit installation, it should say sparcv9 or amd64. An additional 7 GB of free disk space is needed for a 64-bit build.

The build uses the tools contained in /usr/ccs/bin and /usr/bin of a standard developer or full installation of the Solaris operating environment.

Solaris patches specific to the JDK can be downloaded from the SunSolve JDK Solaris patches download page. You should ensure that the latest patch cluster for your version of the Solaris operating environment has also been installed.

Basic Solaris Check List

  1. Install the Bootstrap JDK, set ALT_BOOTDIR.
  2. Install the Binary Plugs, set ALT_BINARY_PLUGS_PATH.
  3. Optional Import JDK, set ALT_JDK_IMPORT_PATH.
  4. Install the Sun Studio Compilers, set ALT_COMPILER_PATH.
  5. Install the CUPS Include files, set ALT_CUPS_HEADERS_PATH.
  6. Install Ant, make sure it is in your PATH.

Basic Windows System Setup

i586 only: The minimum recommended hardware for building the 32-bit or X86 Windows version is an Pentium class processor or better, at least 512 MB of RAM, and approximately 600 MB of free disk space. NOTE: The Windows build machines need to use the file system NTFS. Build machines formatted to FAT32 will not work because FAT32 doesn't support case-sensitivity in file names.

X64 only: The minimum recommended hardware for building the Windows X64 version is an AMD Opteron class processor, at least 1 GB of RAM, and approximately 10 GB of free disk space.

Windows Paths

Windows: Note that GNU make is a historic utility and is based very heavily on shell scripting, so it does not tolerate the Windows habit of having spaces in pathnames or the use of the \characters in pathnames. Luckily on most Windows systems, you can use /instead of \, and there is always a 'short' pathname without spaces for any path that contains spaces. Unfortunately, this short pathname can be somewhat dynamic and the formula is difficult to explain. You can use cygpath utility to map pathnames with spaces or the \character into the C:/ style of pathname (called 'mixed'), e.g. cygpath -s -m "path".

The makefiles will try to translate any pathnames supplied to it into the C:/ style automatically.

Note that use of CYGWIN creates a unique problem with regards to setting PATH. Normally on Windows the PATH variable contains directories separated with the ";" character (Solaris and Linux uses ":"). With CYGWIN, it uses ":", but that means that paths like "C:/path" cannot be placed in the CYGWIN version of PATH and instead CYGWIN uses something like /cygdrive/c/path which CYGWIN understands, but only CYGWIN understands. So be careful with paths on Windows.

Basic Windows Check List

  1. Install the CYGWIN product.
  2. Install the Bootstrap JDK, set ALT_BOOTDIR.
  3. Install the Binary Plugs, set ALT_BINARY_PLUGS_PATH..
  4. Optional Import JDK, set ALT_JDK_IMPORT_PATH.
  5. Install the Microsoft Visual Studio Compilers (32-bit).
  6. Install the Microsoft Platform SDK.
  7. Setup all environment variables for compilers (see compilers).
  8. Install Microsoft DirectX SDK.
  9. Install Ant, make sure it is in your PATH and set ANT_HOME.

Build Dependencies

Depending on the platform, the OpenJDK build process has some basic dependencies on components not part of the OpenJDK sources. Some of these are specific to a platform, some even specific to an architecture. Each dependency will have a set of ALT variables that can be set to tell the makefiles where to locate the component. In most cases setting these ALT variables may not be necessary and the makefiles will find defaults on the system in standard install locations or through component specific variables.

Bootstrap JDK

All OpenJDK builds require access to the previously released JDK 6, this is often called a bootstrap JDK. The JDK 6 binaries can be downloaded from Sun's JDK 6 download site. For build performance reasons is very important that this bootstrap JDK be made available on the local disk of the machine doing the build. You should always set ALT_BOOTDIR to point to the location of the bootstrap JDK installation, this is the directory pathname that contains a bin, lib, and include It's also a good idea to also place its bin directory in the PATH environment variable, although it's not required.

Solaris: Some pre-installed JDK images may be available to you in the directory /usr/jdk/instances. If you don't set ALT_BOOTDIR the makefiles will look in that location for a JDK it can use.

Binary Plugs

Not all of the source code that makes up the JDK is available under an open-source license. This is a temporary situation and these binary plugs will be replaced with fully open source replacements as soon as possible. So currently, in order to build a complete OpenJDK image, you must first download and install the appropriate binary plug bundles for the OpenJDK, go to the OpenJDK site and select the "Bundles(7)" link and download the binaryplugs for your particular platform. The file downloaded is a jar file that must be extracted by running the jar file with: 
            java -jar jdk-7-ea-plug-bnn-os-arch-dd_month_year.jar
A prompt will be issued for acceptance of these binary plug files. During the OpenJDK build process these "binary plugs" for the encumbered components will be copied into your resulting OpenJDK binary build image. These binary plug files are only for the purpose of building an OpenJDK binary. Make sure you set ALT_BINARY_PLUGS_PATH to the root of this installation.

Optional Import JDK

The ALT_JDK_IMPORT_PATH setting is only needed if you are not building the entire JDK. For example, if you have built the entire JDK once, and wanted to avoid repeatedly building the Hotspot VM, you could set this to the location of the previous JDK install image and the build will copy the needed files from this import area.

Ant

All OpenJDK builds require access to least Ant 1.6.5. The Ant tool is available from the Ant download site. You should always make sure ant is in your PATH, and on Windows you may also need to set ANT_HOME to point to the location of the Ant installation, this is the directory pathname that contains a bin and lib.

Certificate Authority File (cacert)

See http://en.wikipedia.org/wiki/Certificate_Authority for a better understanding of the Certificate Authority (CA). A certificates file named "cacerts" represents a system-wide keystore with CA certificates. In JDK and JRE binary bundles, the "cacerts" file contains root CA certificates from several public CAs (e.g., VeriSign, Thawte, and Baltimore). The source contain a cacerts file without CA root certificates. Formal JDK builders will need to secure permission from each public CA and include the certificates into their own custom cacerts file. Failure to provide a populated cacerts file will result in verification errors of a certificate chain during runtime. The variable ALT_CACERTS_FILE can be used to override the default location of the cacerts file that will get placed in your build. By default an empty cacerts file is provided and that should be fine for most JDK developers.

Compilers

Linux gcc/binutils
The GNU gcc compiler version should be 4 or newer. The compiler used should be the default compiler installed in /usr/bin.
Solaris: Sun Studio
At a minimum, the Sun Studio 12 Compilers (containing version 5.9 of the C and C++ compilers) is required, with patches from the SunSolve web site.

Set ALT_COMPILER_PATH to point to the location of the compiler binaries, and place this location in the PATH.

The Sun Studio Express compilers at: Sun Studio Express Download site are also an option, although these compilers have not been extensively used yet.

Windows i586: Microsoft Visual Studio Compilers
The 32-bit OpenJDK Windows build requires Microsoft Visual Studio C++ 2008 (VS2008) Standard Edition compiler. The compiler and other tools are expected to reside in the location defined by the variable VS90COMNTOOLS which is set by the Microsoft Visual Studio installer.

Once the compiler is installed, it is recommended that you run VCVARS32.BAT to set the compiler environment variables INCLUDE, LIB, and PATH prior to building the OpenJDK. The above environment variables MUST be set.

WARNING: Make sure you check out the CYGWIN link.exe WARNING. The path /usr/bin must be after the path to the Visual Studio product.

Windows: Microsoft Platform SDK
On X64, the Microsoft Platform Software Development Kit (SDK), April 2005 Edition compiler, is required for building the OpenJDK because it contains the C/C++ compiler. You will need to minimally install the Core SDK and the MDAC SDK features of this compiler.

Once the Platform SDK is installed, it is recommended that you run SetEnv.Cmd /X64 to set the compiler environment variables MSSDK, MSTOOLS, INCLUDE, LIB, and PATH prior to building the OpenJDK. The above environment variables MUST be set.

This Platform SDK compiler is only used on X64 builds but other parts of the Platform SDK may be used for the X86 builds.

Zip and Unzip

Version 2.2 (November 3rd 1997) or newer of the zip utility and version 5.12 or newer of the unzip utility is needed to build the JDK. With Solaris, Linux, and Windows CYGWIN, the zip and unzip utilities installed on the system should be fine. Information and the source code for ZIP.EXE and UNZIP.EXE is available on the info-zip web site.

Common UNIX Printing System (CUPS) Headers (Solaris & Linux)

Solaris: CUPS header files are required for building the OpenJDK on Solaris. The Solaris header files can be obtained by installing the package SFWcups from the Solaris Software Companion CD/DVD, these often will be installed into /opt/sfw/cups.

Linux: CUPS header files are required for building the OpenJDK on Linux. The Linux header files are usually available from a "cups" development package, it's recommended that you try and use the package provided by the particular version of Linux that you are using.

The CUPS header files can always be downloaded from www.cups.org. The variable ALT_CUPS_HEADERS_PATH can be used to override the default location of the CUPS Header files.

FreeType 2

Version 2.3 or newer of FreeType is required for building the OpenJDK. On Unix systems required files can be available as part of your distribution (while you still may need to upgrade them). Note that you need development version of package that includes both FreeType library and header files.

You can always download latest FreeType version from the FreeType website.

Makefiles will try to pick FreeType from /usr/lib and /usr/include. In case it is installed elsewhere you will need to set environment variables ALT_FREETYPE_LIB_PATH and ALT_FREETYPE_HEADERS_PATH to refer to place where library and header files are installed.

Building the freetype 2 libraries from scratch is also possible, however on Windows refer to the Windows FreeType DLL build instructions.

Note that by default FreeType is built with byte code hinting support disabled due to licensing restrictions. In this case, text appearance and metrics are expected to differ from Sun's official JDK build. See the SourceForge FreeType2 Home Page for more information.

Advanced Linux Sound Architecture (ALSA) (Linux only)

Linux only: Version 0.9.1 or newer of the ALSA files are required for building the OpenJDK on Linux. These Linux files are usually available from an "alsa" of "libasound" development package, it's highly recommended that you try and use the package provided by the particular version of Linux that you are using. The makefiles will check this emit a sanity error if it is missing or the wrong version.

In particular, older Linux systems will likely not have the right version of ALSA installed, for example Redhat AS 2.1 U2 and SuSE 8.1 do not include a sufficiently recent ALSA distribution. On rpm-based systems, you can see if ALSA is installed by running this command: 

                    rpm -qa | grep alsa
Both alsa and alsa-devel packages are needed.

If your distribution does not come with ALSA, and you can't find ALSA packages built for your particular system, you can try to install the pre-built ALSA rpm packages from www.freshrpms.net. Note that installing a newer ALSA could break sound output if an older version of ALSA was previously installed on the system, but it will enable JDK compilation.

Installation: execute as root
[i586]: rpm -Uv --force alsa-lib-devel-0.9.1-rh61.i386.rpm
[x64]: rpm -Uv --force alsa-lib-devel-0.9.8-amd64.x86_64.rpm
Uninstallation:
[i586]: rpm -ev alsa-lib-devel-0.9.1-rh61
[x64]:rpm -ev alsa-lib-devel-0.9.8-amd64
Make sure that you do not link to the static library (libasound.a), by verifying that the dynamic library (libasound.so) is correctly installed in /usr/lib.
As a last resort you can go to the Advanced Linux Sound Architecture Site and build it from source.
Download driver and library source tarballs from ALSA's homepage. As root, execute the following commands (you may need to adapt the version number): 
                        
                            $ tar xjf alsa-driver-0.9.1.tar.bz2
                            $ cd alsa-driver-0.9.1
                            $ ./configure
                            $ make install
                            $ cd ..
                            $ tar xjf alsa-lib-0.9.1.tar.bz2
                            $ cd alsa-lib-0.9.1
                            $ ./configure
                            $ make install
Should one of the above steps fail, refer to the documentation on ALSA's home page.
Note that this is a minimum install that enables building the JDK platform. To actually use ALSA sound drivers, more steps are necessary as outlined in the documentation on ALSA's homepage.

ALSA can be uninstalled by executing make uninstall first in the alsa-lib-0.9.1 directory and then in alsa-driver-0.9.1.

There are no ALT* variables to change the assumed locations of ALSA, the makefiles will expect to find the ALSA include files and library at: /usr/include/alsa and /usr/lib/libasound.so.

Windows Specific Dependencies

Unix Command Tools (CYGWIN)
The OpenJDK requires access to a set of unix command tools on Windows which can be supplied by CYGWIN.

The OpenJDK build requires CYGWIN version 1.5.12 or newer. Information about CYGWIN can be obtained from the CYGWIN website at www.cygwin.com.

By default CYGWIN doesn't install all the tools required for building the OpenJDK. Along with the default installation, you need to install the following tools.

Binary Name Category Package Description
ar.exe Devel binutils The GNU assembler, linker and binary utilities
make.exe Devel make The GNU version of the 'make' utility built for CYGWIN.
NOTE: See the GNU make section
m4.exe Interpreters m4 GNU implementation of the traditional Unix macro processor
cpio.exe Utils cpio A program to manage archives of files
gawk.exe Utils awk Pattern-directed scanning and processing language
file.exe Utils file Determines file type using 'magic' numbers
zip.exe Archive zip Package and compress (archive) files
unzip.exe Archive unzip Extract compressed files in a ZIP archive
free.exe System procps Display amount of free and used memory in the system

Note that the CYGWIN software can conflict with other non-CYGWIN software on your Windows system. CYGWIN provides a FAQ for known issues and problems, of particular interest is the section on BLODA (applications that interfere with CYGWIN).

WARNING: Be very careful with link.exe, it will conflict with the Visual Studio version. You need the Visual Studio version of link.exe, not the CYGWIN one. So it's important that the Visual Studio paths in PATH preceed the CYGWIN path /usr/bin.

Microsoft DirectX 9.0 SDK header files and libraries
Microsoft DirectX 9.0 SDK (Summer 2004) headers are required for building OpenJDK. This SDK can be downloaded from Microsoft DirectX 9.0 SDK (Summer 2004). If the link above becomes obsolete, the SDK can be found from the Microsoft Download Site (search with "DirectX 9.0 SDK Update Summer 2004"). The location of this SDK can be set with ALT_DXSDK_PATH but it's normally found via the DirectX environment variable DXSDK_DIR.
MSVCRT.DLL
i586 only: The OpenJDK 32-bit build requires access to a redistributable MSVCRT.DLL. If the MSVCRT.DLL is not installed in the system32 directory set the ALT_MSVCRT_DLL_PATH variable to the location of this file.

X64 only: The OpenJDK 64-bit build requires access to a redistributable MSVCRT.DLL, which is usually supplied by the Platform SDK. If it is not available from the Platform SDK, set the ALT_MSVCRT_DLL_PATH variable to the location of this file.

MSVCR90.DLL
i586 only: The OpenJDK build requires access to a redistributable MSVCR90.DLL which should be supplied by the Visual Studio product. If the MSVCR90.DLL is not available from the Visual Studio product set the ALT_MSVCR90_DLL_PATH variable to the location of this file.

Creating the Build

Once a machine is setup to build the OpenJDK, the steps to create the build are fairly simple. The various ALT settings can either be made into variables or can be supplied on the gmake command.
  1. Use the sanity rule to double check all the ALT settings:
    gmake sanity [ARCH_DATA_MODEL=32 or 64] [other "ALT_" overrides]
  2. Start the build with the command:
    gmake [ARCH_DATA_MODEL=32 or 64] [ALT_OUTPUTDIR=output_directory] [other "ALT_" overrides]

Solaris: Note that ARCH_DATA_MODEL is really only needed on Solaris to indicate you want to built the 64-bit version. And before the Solaris 64-bit binaries can be used, they must be merged with the binaries from a separate 32-bit build. The merged binaries may then be used in either 32-bit or 64-bit mode, with the selection occurring at runtime with the -d32 or -d64 options.

Testing the Build

When the build is completed, you should see the generated binaries and associated files in the j2sdk-image directory in the output directory. The default output directory is build/platform, where platform is one of In particular, the build/platform/j2sdk-image/bin directory should contain executables for the OpenJDK tools and utilities.

You can test that the build completed properly by using the build to run the various demos that you will find in the build/platform/j2sdk-image/demo directory.

The provided regression tests can be run with the jtreg utility from the jtreg site.

Environment/Make Variables

Some of the environment or make variables (just called variables in this document) that can impact the build are:

PATH
Typically you want to set the PATH to include:
  • The location of the GNU make binary
  • The location of the Bootstrap JDK java (see Bootstrap JDK)
  • The location of the C/C++ compilers (see compilers)
  • The location or locations for the Unix command utilities (e.g. /usr/bin)
MILESTONE
The milestone name for the build (e.g."beta"). The default value is "internal".
BUILD_NUMBER
The build number for the build (e.g. "b27"). The default value is "b00".
ARCH_DATA_MODEL
The ARCH_DATA_MODEL variable is used to specify whether the build is to generate 32-bit or 64-bit binaries. The Solaris build supports either 32-bit or 64-bit builds, but Windows and Linux will support only one, depending on the specific OS being used. Normally, setting this variable is only necessary on Solaris. Set ARCH_DATA_MODEL to 32 for generating 32-bit binaries, or to 64 for generating 64-bit binaries.
ALT_BOOTDIR
The location of the bootstrap JDK installation. See Bootstrap JDK for more information. You should always install your own local Bootstrap JDK and always set ALT_BOOTDIR explicitly.
ALT_BINARY_PLUGS_PATH
The location of the binary plugs installation. See Binary Plugs for more information. You should always have a local copy of a recent Binary Plugs install image and set this variable to that location.
ALT_JDK_IMPORT_PATH
The location of a previously built JDK installation. See Optional Import JDK for more information.
ALT_OUTPUTDIR
An override for specifying the (absolute) path of where the build output is to go. The default output directory will be build/platform.
ALT_COMPILER_PATH
The location of the C/C++ compiler. The default varies depending on the platform.
ALT_CACERTS_FILE
The location of the cacerts file. The default will refer to jdk/src/share/lib/security/cacerts.
ALT_CUPS_HEADERS_PATH
The location of the CUPS header files. See CUPS information for more information. If this path does not exist the fallback path is /usr/include.
ALT_FREETYPE_LIB_PATH
The location of the FreeType shared library. See FreeType information for details.
ALT_FREETYPE_HEADERS_PATH
The location of the FreeType header files. See FreeType information for details.
ALT_JDK_DEVTOOLS_PATH
The default root location of the devtools. The default value is $(ALT_SLASH_JAVA)/devtools.
ALT_DEVTOOLS_PATH
The location of tools like the zip and unzip binaries, but might also contain the GNU make utility (gmake). So this area is a bit of a grab bag, especially on Windows. The default value depends on the platform and Unix Commands being used. On Linux the default will be $(ALT_JDK_DEVTOOLS_PATH)/linux/bin, on Solaris $(ALT_JDK_DEVTOOLS_PATH)/{sparc,i386}/bin, and on Windows with CYGWIN /usr/bin.
ALT_UNIXCCS_PATH
Solaris only: An override for specifying where the Unix CCS command set are located. The default location is /usr/ccs/bin
ALT_SLASH_JAVA
The default root location for many of the ALT path locations of the following ALT variables. The default value is "/java" on Solaris and Linux, "J:" on Windows.
ALT_BUILD_JDK_IMPORT_PATH
These are useful in managing builds on multiple platforms. The default network location for all of the import JDK images for all platforms. If ALT_JDK_IMPORT_PATH is not set, this directory will be used and should contain the following directories: solaris-sparc, solaris-i586, solaris-sparcv9, solaris-amd64, linux-i586, linux-amd64, windows-i586, and windows-amd64. Where each of these directories contain the import JDK image for that platform.
ALT_BUILD_BINARY_PLUGS_PATH
These are useful in managing builds on multiple platforms. The default network location for all of the binary plug images for all platforms. If ALT_BINARY_PLUGS_PATH is not set, this directory will be used and should contain the following directories: solaris-sparc, solaris-i586, solaris-sparcv9, solaris-amd64, linux-i586, linux-amd64, windows-i586, and windows-amd64. Where each of these directories contain the binary plugs image for that platform.
Windows specific:
ALT_MSDEVTOOLS_PATH
The location of the Microsoft Visual Studio tools 'bin' directory. The default is usually derived from ALT_COMPILER_PATH.
ALT_DXSDK_PATH
The location of the Microsoft DirectX 9 SDK. The default will be to try and use the DirectX environment variable DXSDK_DIR, failing that, look in C:/DXSDK.
ALT_MSVCRT_DLL_PATH
The location of the MSVCRT.DLL.
ALT_MSVCR90_DLL_PATH
i586 only: The location of the MSVCR90.DLL.

Troubleshooting

A build can fail for any number of reasons. Most failures are a result of trying to build in an environment in which all the pre-build requirements have not been met. The first step in troubleshooting a build failure is to recheck that you have satisfied all the pre-build requirements for your platform. Look for the check list of the platform you are building on in the Table of Contents.

You can validate your build environment by using the sanity target. Any errors listed will stop the build from starting, and any warnings may result in a flawed product build. We strongly encourage you to evaluate every sanity check warning and fix it if required, before you proceed further with your build.

Some of the more common problems with builds are briefly described below, with suggestions for remedies.