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Some software may be in the form of source code that you need to compile before you can install it. This is particularly true of programs designed for cross-platform implementations. Programs designed to run on various Unix systems, such as Sun, as well as on Linux, may be distributed as source code that is downloaded and compiled in those different systems. Compiling such software has been greatly simplified in recent years by the use of configuration scripts that automatically detect a given system s hardware and software configuration which then allows you to compile the program accordingly. For example, the name of the C compiler on a system could be gcc or cc. Configuration scripts detect which is present and select it for use in the program compilation. A configure script works by generating a customized Makefile, designed for that particular system. A Makefile contains detailed commands to compile a program, including any preprocessing, links to required libraries, and the compilation of program components in their proper order. Many Makefiles for complex applications may have to access several software subdirectories, each with separate components to compile. The use of configure and Makefile scripts vastly automates the compile process, reducing the procedure to a few simple steps.
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First, change to the directory where the software s source code has been extracted: # cd /usr/local/src/cdrchive-1.2.2 Before you compile software, read the README or INSTALL files included with it. These give you detailed instructions on how to compile and install this particular program. Most software can be compiled and installed in three simple steps. The first step is the ./configure command that generates your customized Makefile. The second step is the make command, which uses the Makefile in your working directory in this case, the Makefile you just generated with the ./configure command and uses it to compile your software. The final step also uses the make command, but this time with the install option. The Makefile generated by the ./configure command also contains instructions for installing the software on your system. Using the install option runs just those installation commands. To perform the installation, you have to be logged in as the root user, giving you the ability to add software files to system directories, as needed. If the software uses configuration scripts, compiling and installing usually involves only the following three simple commands: # ./configure # make # make install In the previous example, the./configure command performs configuration detection. The make command performs the actual compiling, using a makefile script generated by the ./configure operation. The make install command installs the program on your system, placing the executable program in a directory, such as /usr/local/bin, and any configuration files in /etc. Any shared libraries it created may go into /usr/local/lib. Once you have compiled and installed your application, and you have checked that it is working properly, you can remove the source code directory that was created when
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you extracted the software. You can keep the archive file (tar) in case you need to extract the software again. Use rm with the -rf options so all subdirectories will be deleted and you do not have to confirm each deletion: # rm -rf cdrchive.1.2.2
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before the configure command. ./ references a command 3 in the current working directory, rather than another Linux command.
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Certain software may have specific options set up for the ./configure operation. To find out what these are, you use the ./configure command with the --help option. # ./configure --help
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A useful common option is the -prefix option, which lets 3 you specify the install directory: # ./configure -prefix=/usr/bin
TIP Some older X applications use xmkmf directly instead of a configure script to generate the needed Makefile. In this case, enter the command xmkmf in place of ./configure. Be sure to consult the INSTALL and README files for the software.
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