13.2 Compilers and Options

Some systems require unusual options for compilation or linking that the configure script does not know about. Run `./configure --help' for details on some of the pertinent environment variables.

You can give configure initial values for variables by setting them in the environment. You can do that on the command line like this:

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

See section 13.8 Defining Variables, for more details.