h2xs [OPTIONS ... ] [headerfile [extra_libraries]]
version: 1.23
OPTIONS:
    -A, --omit-autoload   Omit all autoloading facilities (implies -c).
    -B, --beta-version    Use beta $VERSION of 0.00_01 (ignored if -v).
    -C, --omit-changes    Omit creating the Changes file, add HISTORY heading
                          to stub POD.
    -F, --cpp-flags       Additional flags for C preprocessor/compile.
    -M, --func-mask       Mask to select C functions/macros
                          (default is select all).
    -O, --overwrite-ok    Allow overwriting of a pre-existing extension directory.
    -P, --omit-pod        Omit the stub POD section.
    -X, --omit-XS         Omit the XS portion (implies both -c and -f).
    -a, --gen-accessors   Generate get/set accessors for struct and union members
                          (used with -x).
    -b, --compat-version  Specify a perl version to be backwards compatible with.
    -c, --omit-constant   Omit the constant() function and specialised AUTOLOAD
                          from the XS file.
    -d, --debugging       Turn on debugging messages.
    -e, --omit-enums      Omit constants from enums in the constant() function.
                          If a pattern is given, only the matching enums are
                          ignored.
    -f, --force           Force creation of the extension even if the C header
                          does not exist.
    -g, --global          Include code for safely storing static data in the .xs file.
    -h, -?, --help        Display this help message.
    -k, --omit-const-func Omit 'const' attribute on function arguments
                          (used with -x).
    -m, --gen-tied-var    Generate tied variables for access to declared
                          variables.
    -n, --name            Specify a name to use for the extension (recommended).
    -o, --opaque-re       Regular expression for "opaque" types.
    -p, --remove-prefix   Specify a prefix which should be removed from the
                          Perl function names.
    -s, --const-subs      Create subroutines for specified macros.
    -t, --default-type    Default type for autoloaded constants (default is IV).
        --use-new-tests   Use Test::More in backward compatible modules.
        --use-old-tests   Use the module Test rather than Test::More.
        --skip-exporter   Do not export symbols.
        --skip-ppport     Do not use portability layer.
        --skip-autoloader Do not use the module C<AutoLoader>.
        --skip-strict     Do not use the pragma C<strict>.
        --skip-warnings   Do not use the pragma C<warnings>.
    -v, --version         Specify a version number for this extension.
    -x, --autogen-xsubs   Autogenerate XSUBs using C::Scan.
        --use-xsloader    Use XSLoader in backward compatible modules (ignored
                          when used with -X).

extra_libraries
         are any libraries that might be needed for loading the
         extension, e.g. -lm would try to link in the math library.