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Add description of RUBY_CFLAGS to README.

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Eloy Durán 2013-09-07 00:36:13 +02:00
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@ -113,6 +113,8 @@ You can set certain environment variables to control the build process.
* `RUBY_BUILD_SKIP_MIRROR`, if set, forces ruby-build to download packages from
their original source URLs instead of using a mirror.
* `CC` sets the path to the C compiler.
* `RUBY_CFLAGS` lets you pass additional options to the default `CFLAGS`. Use
this to override, for instance, the `-O3` option.
* `CONFIGURE_OPTS` lets you pass additional options to `./configure`.
* `MAKE` lets you override the command to use for `make`. Useful for specifying
GNU make (`gmake`) on some systems.