Installation Names (Bash Reference Manual)
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10.4 Installation Names
By default, ‘make install’ will install into /usr/local/bin, /usr/local/man, etc. You can specify an installation prefix other than /usr/local by giving configure the option --prefix=PATH, or by specifying a value for the DESTDIR ‘make’ variable when running ‘make install’.
You can specify separate installation prefixes for architecture-specific files and architecture-independent files. If you give configure the option --exec-prefix=PATH, ‘make install’ will use PATH as the prefix for installing programs and libraries. Documentation and other data files will still use the regular prefix.