@node ax_lib_upnp
@unnumberedsec ax_lib_upnp

@majorheading Synopsis

@smallexample
AX_LIB_UPNP([ACTION-IF-TRUE], [ACTION-IF-FALSE])
@end smallexample

@majorheading Description

This macro will check for the existence of libupnp
(http://upnp.sourceforge.net/). It does this by checking for the header
file upnp.h and the upnp library object file. A --with-libupnp option is
supported as well. The following output variables are set with AC_SUBST:

@smallexample
  UPNP_CPPFLAGS
  UPNP_LDFLAGS
  UPNP_LIBS
@end smallexample

You can use them like this in Makefile.am:

@smallexample
  AM_CPPFLAGS = $(UPNP_CPPFLAGS)
  AM_LDFLAGS = $(UPNP_LDFLAGS)
  program_LDADD = $(UPNP_LIBS)
@end smallexample

Additionally, the C preprocessor symbol HAVE_LIBUPNP will be defined
with AC_DEFINE if libupnp is available.

@majorheading Source Code

Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_lib_upnp.m4,latest
version of @file{ax_lib_upnp.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_lib_upnp.m4,the
macro's revision history}.

@majorheading License

@w{Copyright @copyright{} 2009 Oskar Liljeblad @email{oskar@@osk.mine.nu}}

Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice
and this notice are preserved. This file is offered as-is, without any
warranty.