Use --with-cairo to compile Emacs with Cairo drawing.
+Use --with-modules to build Emacs with support for loading dynamic
+modules.
+
Use --enable-gcc-warnings to enable compile-time checks that warn
about possibly-questionable C code. This is intended for developers
and is useful with GNU-compatible compilers. On a recent GNU system
there should be no warnings; on older and on non-GNU systems the
-generated warnings may still be useful, though you may prefer building
-with 'make WERROR_CFLAGS=' so that the warnings are not treated as
-errors.
+generated warnings may still be useful, though you may prefer
+configuring with --enable-gcc-warnings=warn-only so they are not
+treated as errors. The default is --enable-gcc-warnings=warn-only if
+it appears to be a developer build, and is --disable-gcc-warnings
+otherwise.
Use --disable-silent-rules to cause 'make' to give more details about
the commands it executes. This can be helpful when debugging a build