(autoconf.info)Compilers and Options

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10.2 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

Or on systems that have the 'env' program, you can do it like this:
     env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure