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(bashref.info)Compilers and Options

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Compilers and Options
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   Some systems require unusual options for compilation or linking that
the `configure' script does not know about.  You can give `configure'
initial values for variables by setting them in the environment.  Using
a Bourne-compatible shell, you can do that on the command line like
this:

     CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure

   On systems that have the `env' program, you can do it like this:

     env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure

   The configuration process uses GCC to build Bash if it is available.