12.5. Writing Something After bsd.port.mk

12.5. Writing Something After `bsd.port.mk`
前一頁	章 12. Dos and Don'ts	下一頁

12.5. Writing Something After `bsd.port.mk`

Do not write anything after the .include <bsd.port.mk> line. It usually can be avoided by including bsd.port.pre.mk somewhere in the middle of the Makefile and bsd.port.post.mk at the end.

重要:

Include either the bsd.port.pre.mk/bsd.port.post.mk pair or bsd.port.mk only; do not mix these two usages.

bsd.port.pre.mk only defines a few variables, which can be used in tests in the Makefile, bsd.port.post.mk defines the rest.

Here are some important variables defined in bsd.port.pre.mk (this is not the complete list, please read bsd.port.mk for the complete list).

Variable	描述
`ARCH`	The architecture as returned by `uname -m` (for example, `i386`)
`OPSYS`	The operating system type, as returned by `uname -s` (for example, `FreeBSD`)
`OSREL`	The release version of the operating system (for example, `2.1.5` or `2.2.7`)
`OSVERSION`	The numeric version of the operating system; the same as `__FreeBSD_version`.
`LOCALBASE`	The base of the “local” tree (for example, `/usr/local`)
`PREFIX`	Where the port installs itself (see more on `PREFIX`).

注意:

When MASTERDIR is needed, always define it before including bsd.port.pre.mk.

Here are some examples of things that can be added after bsd.port.pre.mk:

# no need to compile lang/perl5 if perl5 is already in system
.if ${OSVERSION} > 300003
BROKEN=	perl is in system
.endif

Always use tab instead of spaces after BROKEN=.

前一頁	上一層	下一頁
12.4. Differentiating Operating Systems and OS Versions	起始頁	12.6. 在 Wrapper Scripts 中使用 `exec`　敘述句