6.3. Building mechanisms
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## 6.3. Building mechanisms

### 6.3.1. `make`, `gmake`, and `imake`

If your port uses GNU make, set `USE_GMAKE=yes`.

表格 6.1. Variables for ports related to gmake

Variable | Means
--- | ---
`USE_GMAKE` | The port requires `gmake` to build.
`GMAKE` | The full path for `gmake` if it is not in the `PATH`.

If your port is an X application that creates `Makefile` files from `Imakefile` files using imake, then set `USE_IMAKE=yes`. This will cause the configure stage to automatically do an `xmkmf -a`. If the `-a` flag is a problem for your port, set `XMKMF=xmkmf`. If the port uses imake but does not understand the `install.man` target, `NO_INSTALL_MANPAGES=yes` should be set.

If your port's source `Makefile` has something else than `all` as the main build target, set `ALL_TARGET` accordingly. Same goes for `install` and `INSTALL_TARGET`.

### 6.3.2. `configure` script

If your port uses the `configure` script to generate `Makefile` files from `Makefile.in` files, set `GNU_CONFIGURE=yes`. If you want to give extra arguments to the `configure` script (the default argument is `--prefix=${PREFIX} --infodir=${PREFIX}/${INFO_PATH} --mandir=${MANPREFIX}/man --build=${CONFIGURE_TARGET}`), set those extra arguments in `CONFIGURE_ARGS`. Extra environment variables can be passed using `CONFIGURE_ENV` variable.

表格 6.2. Variables for ports that use configure

Variable | Means
--- | ---
`GNU_CONFIGURE` | The port uses `configure` script to prepare build.
`HAS_CONFIGURE` | Same as `GNU_CONFIGURE`, except default configure target is not added to `CONFIGURE_ARGS`.
`CONFIGURE_ARGS` | Additional arguments passed to `configure` script.
`CONFIGURE_ENV` | Additional environment variables to be set for `configure` script run.
`CONFIGURE_TARGET` | Override default configure target. Default value is `${MACHINE_ARCH}-portbld-freebsd${OSREL}`.

### 6.3.3. Using `scons`

If your port uses SCons, define `USE_SCONS=yes`.

表格 6.3. Variables for ports that use `scons`

Variable | Means
--- | ---
`SCONS_ARGS` | Port specific SCons flags passed to the SCons environment.
`SCONS_BUILDENV` | Variables to be set in system environment.
`SCONS_ENV` | Variables to be set in SCons environment.
`SCONS_TARGET` | Last argument passed to SCons, similar to `MAKE_TARGET`.

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