configure.ac - platform/external/libvorbis - Git at Google

 dnl Process this file with autoconf to produce a configure script

 dnl ------------------------------------------------
 dnl Initialization and Versioning
 dnl ------------------------------------------------


 AC_INIT([libvorbis],[1.3.1],[vorbis-dev@xiph.org])

 AC_CONFIG_SRCDIR([lib/mdct.c])

 AC_CANONICAL_TARGET([])

 AM_INIT_AUTOMAKE($PACKAGE_NAME,$PACKAGE_VERSION)
 AM_MAINTAINER_MODE
 AM_CONFIG_HEADER([config.h])

 dnl Add parameters for aclocal
 AC_SUBST(ACLOCAL_AMFLAGS, "-I m4")

 dnl Library versioning
 dnl - library source changed -> increment REVISION
 dnl - interfaces added/removed/changed -> increment CURRENT, REVISION = 0
 dnl - interfaces added -> increment AGE
 dnl - interfaces removed -> AGE = 0

 V_LIB_CURRENT=4
 V_LIB_REVISION=4
 V_LIB_AGE=4

 VF_LIB_CURRENT=6
 VF_LIB_REVISION=2
 VF_LIB_AGE=3

 VE_LIB_CURRENT=2
 VE_LIB_REVISION=7
 VE_LIB_AGE=0

 AC_SUBST(V_LIB_CURRENT)
 AC_SUBST(V_LIB_REVISION)
 AC_SUBST(V_LIB_AGE)
 AC_SUBST(VF_LIB_CURRENT)
 AC_SUBST(VF_LIB_REVISION)
 AC_SUBST(VF_LIB_AGE)
 AC_SUBST(VE_LIB_CURRENT)
 AC_SUBST(VE_LIB_REVISION)
 AC_SUBST(VE_LIB_AGE)

 dnl --------------------------------------------------
 dnl Check for programs
 dnl --------------------------------------------------

 dnl save $CFLAGS since AC_PROG_CC likes to insert "-g -O2"
 dnl if $CFLAGS is blank
 cflags_save="$CFLAGS"
 AC_PROG_CC
 AC_PROG_CPP
 CFLAGS="$cflags_save"

 AC_C_INLINE

 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL
 AM_PROG_CC_C_O

 dnl Check for doxygen
 if test "x$enable_docs" = xyes; then
   AC_CHECK_PROG(HAVE_DOXYGEN, doxygen, true, false)
   if test $HAVE_DOXYGEN = "false"; then
     AC_MSG_WARN([*** doxygen not found, API documentation will not be built])
   fi
 else
   HAVE_DOXYGEN=false
 fi
 AM_CONDITIONAL(HAVE_DOXYGEN,$HAVE_DOXYGEN)

 dnl latex tools for the specification document
 AC_ARG_ENABLE(docs,
 	AC_HELP_STRING([--enable-docs], [build the documentation]))

 if test "x$enable_docs" = xyes; then
   AC_CHECK_PROGS([PDFLATEX], pdflatex, [/bin/false])
   AC_CHECK_PROGS([HTLATEX], htlatex, [/bin/false])
   if test "x$PDFLATEX" = x/bin/false || test "x$HTLATEX" = x/bin/false; then
     enable_docs=no
     AC_MSG_WARN([Documentation will not be built!])
   fi
 fi

 AM_CONDITIONAL(BUILD_DOCS, [test "x$enable_docs" = xyes])

 AC_ARG_ENABLE(examples,
   AS_HELP_STRING([--enable-examples], [build the examples]))

 AM_CONDITIONAL(BUILD_EXAMPLES, [test "x$enable_examples" = xyes])

 dnl --------------------------------------------------
 dnl Set build flags based on environment
 dnl --------------------------------------------------

 dnl Set some target options

 cflags_save="$CFLAGS"
 if test -z "$GCC"; then
 	case $host in
 	*-*-irix*)
 		dnl If we're on IRIX, we wanna use cc even if gcc
 		dnl is there (unless the user has overriden us)...
 		if test -z "$CC"; then
 			CC=cc
 		fi
 		DEBUG="-g -signed"
 		CFLAGS="-O2 -w -signed"
 		PROFILE="-p -g3 -O2 -signed" ;;
 	sparc-sun-solaris*)
 		DEBUG="-v -g"
 		CFLAGS="-xO4 -fast -w -fsimple -native -xcg92"
 		PROFILE="-v -xpg -g -xO4 -fast -native -fsimple -xcg92 -Dsuncc" ;;
 	*)
 		DEBUG="-g"
 		CFLAGS="-O"
 		PROFILE="-g -p" ;;
         esac
 else

 	AC_MSG_CHECKING([GCC version])
 	GCC_VERSION=`$CC -dumpversion`
 	AC_MSG_RESULT([$GCC_VERSION])
 	case $host in
 	*86-*-linux*)
 		DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"
 		CFLAGS="-O20 -ffast-math -mno-ieee-fp -D_REENTRANT -fsigned-char"
 #              	PROFILE="-Wall -Wextra -pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char -fno-inline -static"
 		PROFILE="-Wall -Wextra -pg -g -O20 -ffast-math -mno-ieee-fp -D_REENTRANT -fsigned-char -fno-inline"

 		# glibc < 2.1.3 has a serious FP bug in the math inline header
 		# that will cripple Vorbis.  Look to see if the magic FP stack
 		# clobber is missing in the mathinline header, thus indicating
 		# the buggy version

 		AC_EGREP_CPP(log10.*fldlg2.*fxch,[
 				#define __LIBC_INTERNAL_MATH_INLINES 1
 			     	#define __OPTIMIZE__
 				#include <math.h>
 				],bad=maybe,bad=no)
 		if test ${bad} = "maybe" ;then
 		      AC_EGREP_CPP(log10.*fldlg2.*fxch.*st\([[0123456789]]*\),
 					[
 					#define __LIBC_INTERNAL_MATH_INLINES 1
 				     	#define __OPTIMIZE__
 					#include <math.h>
 					],bad=no,bad=yes)
 		fi
  		if test ${bad} = "yes" ;then
  AC_MSG_WARN([                                                        ])
  AC_MSG_WARN([********************************************************])
  AC_MSG_WARN([* The glibc headers on this machine have a serious bug *])
  AC_MSG_WARN([* in /usr/include/bits/mathinline.h  This bug affects  *])
  AC_MSG_WARN([* all floating point code, not just Ogg, built on this *])
  AC_MSG_WARN([* machine.  Upgrading to glibc 2.1.3 is strongly urged *])
  AC_MSG_WARN([* to correct the problem.  Note that upgrading glibc   *])
  AC_MSG_WARN([* will not fix any previously built programs; this is  *])
  AC_MSG_WARN([* a compile-time time bug.                             *])
  AC_MSG_WARN([* To work around the problem for this build of Ogg,    *])
  AC_MSG_WARN([* autoconf is disabling all math inlining.  This will  *])
  AC_MSG_WARN([* hurt Ogg performace but is necessary for an Ogg that *])
  AC_MSG_WARN([* will actually work.  Once glibc is upgraded, rerun   *])
  AC_MSG_WARN([* configure and make to build with inlining.           *])
  AC_MSG_WARN([********************************************************])
  AC_MSG_WARN([                                                        ])

   		CFLAGS=${OPT}" -D__NO_MATH_INLINES"
   		PROFILE=${PROFILE}" -D__NO_MATH_INLINES"
   		fi;;
         powerpc-*-linux*spe)
  	        DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES"
  	        CFLAGS="-O3 -Wall -Wextra -ffast-math -mfused-madd -D_REENTRANT"
  	        PROFILE="-pg -g -O3 -ffast-math -mfused-madd -D_REENTRANT";;
 	powerpc-*-linux*)
 		DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES"
 		CFLAGS="-O3 -Wall -Wextra -ffast-math -mfused-madd -mcpu=750 -D_REENTRANT"
 		PROFILE="-pg -g -O3 -ffast-math -mfused-madd -mcpu=750 -D_REENTRANT";;
 	*-*-linux*)
 		DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"
 		CFLAGS="-O20 -Wall -Wextra -ffast-math -D_REENTRANT -fsigned-char"
 		PROFILE="-pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char";;
 	sparc-sun-*)
 		sparc_cpu=""
 		AC_MSG_CHECKING([if gcc supports -mv8])
 		old_cflags="$CFLAGS"
 		CFLAGS="$CFLAGS -mv8"
 		AC_TRY_COMPILE(, [return 0;], [
 			AC_MSG_RESULT([yes])
 			sparc_cpu="-mv8"
 		])
 		CFLAGS="$old_cflags"
 		DEBUG="-g -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
 		CFLAGS="-O20 -Wall -Wextra -ffast-math -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
 		PROFILE="-pg -g -O20 -D__NO_MATH_INLINES -fsigned-char $sparc_cpu" ;;
 	*-*-darwin*)
 		DEBUG="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O0 -fsigned-char"
 		CFLAGS="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O4 -ffast-math -fsigned-char"
 		PROFILE="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -pg -O4 -ffast-math -fsigned-char";;
 	*-*-os2*)
 		# Use -W instead of -Wextra because gcc on OS/2 is an old version.
 		DEBUG="-g -Wall -W -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"
 		CFLAGS="-O20 -Wall -W -ffast-math -D_REENTRANT -fsigned-char"
 		PROFILE="-pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char";;
  	*)
 		DEBUG="-g -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char"
 		CFLAGS="-O20 -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char"
 		PROFILE="-O20 -g -pg -D__NO_MATH_INLINES -fsigned-char" ;;
         esac

         AC_ADD_CFLAGS([-Wdeclaration-after-statement])
 fi
 CFLAGS="$CFLAGS $cflags_save"

 dnl --------------------------------------------------
 dnl Check for headers
 dnl --------------------------------------------------

 AC_CHECK_HEADER(memory.h,CFLAGS="$CFLAGS -DUSE_MEMORY_H",:)

 dnl --------------------------------------------------
 dnl Check for typedefs, structures, etc
 dnl --------------------------------------------------

 dnl none

 dnl --------------------------------------------------
 dnl Check for libraries
 dnl --------------------------------------------------

 AC_CHECK_LIB(m, cos, VORBIS_LIBS="-lm", VORBIS_LIBS="")
 AC_CHECK_LIB(pthread, pthread_create, pthread_lib="-lpthread", :)

 PKG_PROG_PKG_CONFIG

 HAVE_OGG=no
 if test "x$PKG_CONFIG" != "x"
 then
   PKG_CHECK_MODULES(OGG, ogg >= 1.0, HAVE_OGG=yes, HAVE_OGG=no)
 fi
 if test "x$HAVE_OGG" = "xno"
 then
   dnl fall back to the old school test
   XIPH_PATH_OGG(, AC_MSG_ERROR(must have Ogg installed!))
   libs_save=$LIBS
   LIBS="$OGG_LIBS $VORBIS_LIBS"
   AC_CHECK_FUNC(oggpack_writealign, , AC_MSG_ERROR(Ogg >= 1.0 required !))
   LIBS=$libs_save
 fi

 dnl --------------------------------------------------
 dnl Check for library functions
 dnl --------------------------------------------------

 AC_FUNC_ALLOCA
 AC_FUNC_MEMCMP

 dnl --------------------------------------------------
 dnl Do substitutions
 dnl --------------------------------------------------

 AC_SUBST(VORBIS_LIBS)
 AC_SUBST(DEBUG)
 AC_SUBST(PROFILE)
 AC_SUBST(pthread_lib)

 dnl The following line causes the libtool distributed with the source
 dnl to be replaced if the build system has a more recent version.
 AC_SUBST(LIBTOOL_DEPS)

 AC_OUTPUT([
 Makefile
 m4/Makefile
 lib/Makefile
 lib/modes/Makefile
 lib/books/Makefile
 lib/books/coupled/Makefile
 lib/books/uncoupled/Makefile
 lib/books/floor/Makefile
 doc/Makefile doc/vorbisfile/Makefile doc/vorbisenc/Makefile
 doc/Doxyfile
 include/Makefile include/vorbis/Makefile
 examples/Makefile
 test/Makefile
 vq/Makefile
 libvorbis.spec
 vorbis.pc
 vorbisenc.pc
 vorbisfile.pc
 vorbis-uninstalled.pc
 vorbisenc-uninstalled.pc
 vorbisfile-uninstalled.pc
 ])
	dnl Process this file with autoconf to produce a configure script

	dnl ------------------------------------------------
	dnl Initialization and Versioning
	dnl ------------------------------------------------


	AC_INIT([libvorbis],[1.3.1],[vorbis-dev@xiph.org])

	AC_CONFIG_SRCDIR([lib/mdct.c])

	AC_CANONICAL_TARGET([])

	AM_INIT_AUTOMAKE($PACKAGE_NAME,$PACKAGE_VERSION)
	AM_MAINTAINER_MODE
	AM_CONFIG_HEADER([config.h])

	dnl Add parameters for aclocal
	AC_SUBST(ACLOCAL_AMFLAGS, "-I m4")

	dnl Library versioning
	dnl - library source changed -> increment REVISION
	dnl - interfaces added/removed/changed -> increment CURRENT, REVISION = 0
	dnl - interfaces added -> increment AGE
	dnl - interfaces removed -> AGE = 0

	V_LIB_CURRENT=4
	V_LIB_REVISION=4
	V_LIB_AGE=4

	VF_LIB_CURRENT=6
	VF_LIB_REVISION=2
	VF_LIB_AGE=3

	VE_LIB_CURRENT=2
	VE_LIB_REVISION=7
	VE_LIB_AGE=0

	AC_SUBST(V_LIB_CURRENT)
	AC_SUBST(V_LIB_REVISION)
	AC_SUBST(V_LIB_AGE)
	AC_SUBST(VF_LIB_CURRENT)
	AC_SUBST(VF_LIB_REVISION)
	AC_SUBST(VF_LIB_AGE)
	AC_SUBST(VE_LIB_CURRENT)
	AC_SUBST(VE_LIB_REVISION)
	AC_SUBST(VE_LIB_AGE)

	dnl --------------------------------------------------
	dnl Check for programs
	dnl --------------------------------------------------

	dnl save $CFLAGS since AC_PROG_CC likes to insert "-g -O2"
	dnl if $CFLAGS is blank
	cflags_save="$CFLAGS"
	AC_PROG_CC
	AC_PROG_CPP
	CFLAGS="$cflags_save"

	AC_C_INLINE

	AC_LIBTOOL_WIN32_DLL
	AC_PROG_LIBTOOL
	AM_PROG_CC_C_O

	dnl Check for doxygen
	if test "x$enable_docs" = xyes; then
	AC_CHECK_PROG(HAVE_DOXYGEN, doxygen, true, false)
	if test $HAVE_DOXYGEN = "false"; then
	AC_MSG_WARN([*** doxygen not found, API documentation will not be built])
	fi
	else
	HAVE_DOXYGEN=false
	fi
	AM_CONDITIONAL(HAVE_DOXYGEN,$HAVE_DOXYGEN)

	dnl latex tools for the specification document
	AC_ARG_ENABLE(docs,
	AC_HELP_STRING([--enable-docs], [build the documentation]))

	if test "x$enable_docs" = xyes; then
	AC_CHECK_PROGS([PDFLATEX], pdflatex, [/bin/false])
	AC_CHECK_PROGS([HTLATEX], htlatex, [/bin/false])
	if test "x$PDFLATEX" = x/bin/false \|\| test "x$HTLATEX" = x/bin/false; then
	enable_docs=no
	AC_MSG_WARN([Documentation will not be built!])
	fi
	fi

	AM_CONDITIONAL(BUILD_DOCS, [test "x$enable_docs" = xyes])

	AC_ARG_ENABLE(examples,
	AS_HELP_STRING([--enable-examples], [build the examples]))

	AM_CONDITIONAL(BUILD_EXAMPLES, [test "x$enable_examples" = xyes])

	dnl --------------------------------------------------
	dnl Set build flags based on environment
	dnl --------------------------------------------------

	dnl Set some target options

	cflags_save="$CFLAGS"
	if test -z "$GCC"; then
	case $host in
	--irix*)
	dnl If we're on IRIX, we wanna use cc even if gcc
	dnl is there (unless the user has overriden us)...
	if test -z "$CC"; then
	CC=cc
	fi
	DEBUG="-g -signed"
	CFLAGS="-O2 -w -signed"
	PROFILE="-p -g3 -O2 -signed" ;;
	sparc-sun-solaris*)
	DEBUG="-v -g"
	CFLAGS="-xO4 -fast -w -fsimple -native -xcg92"
	PROFILE="-v -xpg -g -xO4 -fast -native -fsimple -xcg92 -Dsuncc" ;;
	*)
	DEBUG="-g"
	CFLAGS="-O"
	PROFILE="-g -p" ;;
	esac
	else

	AC_MSG_CHECKING([GCC version])
	GCC_VERSION=`$CC -dumpversion`
	AC_MSG_RESULT([$GCC_VERSION])
	case $host in
	86--linux*)
	DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"
	CFLAGS="-O20 -ffast-math -mno-ieee-fp -D_REENTRANT -fsigned-char"
	# PROFILE="-Wall -Wextra -pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char -fno-inline -static"
	PROFILE="-Wall -Wextra -pg -g -O20 -ffast-math -mno-ieee-fp -D_REENTRANT -fsigned-char -fno-inline"

	# glibc < 2.1.3 has a serious FP bug in the math inline header
	# that will cripple Vorbis. Look to see if the magic FP stack
	# clobber is missing in the mathinline header, thus indicating
	# the buggy version

	AC_EGREP_CPP(log10.fldlg2.fxch,[
	#define __LIBC_INTERNAL_MATH_INLINES 1
	#define __OPTIMIZE__
	#include <math.h>
	],bad=maybe,bad=no)
	if test ${bad} = "maybe" ;then
	AC_EGREP_CPP(log10.fldlg2.fxch.st\([[0123456789]]\),
	[
	#define __LIBC_INTERNAL_MATH_INLINES 1
	#define __OPTIMIZE__
	#include <math.h>
	],bad=no,bad=yes)
	fi
	if test ${bad} = "yes" ;then
	AC_MSG_WARN([ ])
	AC_MSG_WARN([********************************************************])
	AC_MSG_WARN([* The glibc headers on this machine have a serious bug *])
	AC_MSG_WARN([* in /usr/include/bits/mathinline.h This bug affects *])
	AC_MSG_WARN([* all floating point code, not just Ogg, built on this *])
	AC_MSG_WARN([* machine. Upgrading to glibc 2.1.3 is strongly urged *])
	AC_MSG_WARN([* to correct the problem. Note that upgrading glibc *])
	AC_MSG_WARN([* will not fix any previously built programs; this is *])
	AC_MSG_WARN([* a compile-time time bug. *])
	AC_MSG_WARN([* To work around the problem for this build of Ogg, *])
	AC_MSG_WARN([* autoconf is disabling all math inlining. This will *])
	AC_MSG_WARN([* hurt Ogg performace but is necessary for an Ogg that *])
	AC_MSG_WARN([* will actually work. Once glibc is upgraded, rerun *])
	AC_MSG_WARN([* configure and make to build with inlining. *])
	AC_MSG_WARN([********************************************************])
	AC_MSG_WARN([ ])

	CFLAGS=${OPT}" -D__NO_MATH_INLINES"
	PROFILE=${PROFILE}" -D__NO_MATH_INLINES"
	fi;;
	powerpc--linuxspe)
	DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES"
	CFLAGS="-O3 -Wall -Wextra -ffast-math -mfused-madd -D_REENTRANT"
	PROFILE="-pg -g -O3 -ffast-math -mfused-madd -D_REENTRANT";;
	powerpc--linux)
	DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES"
	CFLAGS="-O3 -Wall -Wextra -ffast-math -mfused-madd -mcpu=750 -D_REENTRANT"
	PROFILE="-pg -g -O3 -ffast-math -mfused-madd -mcpu=750 -D_REENTRANT";;
	--linux*)
	DEBUG="-g -Wall -Wextra -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"
	CFLAGS="-O20 -Wall -Wextra -ffast-math -D_REENTRANT -fsigned-char"
	PROFILE="-pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char";;
	sparc-sun-*)
	sparc_cpu=""
	AC_MSG_CHECKING([if gcc supports -mv8])
	old_cflags="$CFLAGS"
	CFLAGS="$CFLAGS -mv8"
	AC_TRY_COMPILE(, [return 0;], [
	AC_MSG_RESULT([yes])
	sparc_cpu="-mv8"
	])
	CFLAGS="$old_cflags"
	DEBUG="-g -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
	CFLAGS="-O20 -Wall -Wextra -ffast-math -D__NO_MATH_INLINES -fsigned-char $sparc_cpu"
	PROFILE="-pg -g -O20 -D__NO_MATH_INLINES -fsigned-char $sparc_cpu" ;;
	--darwin*)
	DEBUG="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O0 -fsigned-char"
	CFLAGS="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -O4 -ffast-math -fsigned-char"
	PROFILE="-DDARWIN -fno-common -force_cpusubtype_ALL -Wall -g -pg -O4 -ffast-math -fsigned-char";;
	--os2*)
	# Use -W instead of -Wextra because gcc on OS/2 is an old version.
	DEBUG="-g -Wall -W -D_REENTRANT -D__NO_MATH_INLINES -fsigned-char"
	CFLAGS="-O20 -Wall -W -ffast-math -D_REENTRANT -fsigned-char"
	PROFILE="-pg -g -O20 -ffast-math -D_REENTRANT -fsigned-char";;
	*)
	DEBUG="-g -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char"
	CFLAGS="-O20 -Wall -Wextra -D__NO_MATH_INLINES -fsigned-char"
	PROFILE="-O20 -g -pg -D__NO_MATH_INLINES -fsigned-char" ;;
	esac

	AC_ADD_CFLAGS([-Wdeclaration-after-statement])
	fi
	CFLAGS="$CFLAGS $cflags_save"

	dnl --------------------------------------------------
	dnl Check for headers
	dnl --------------------------------------------------

	AC_CHECK_HEADER(memory.h,CFLAGS="$CFLAGS -DUSE_MEMORY_H",:)

	dnl --------------------------------------------------
	dnl Check for typedefs, structures, etc
	dnl --------------------------------------------------

	dnl none

	dnl --------------------------------------------------
	dnl Check for libraries
	dnl --------------------------------------------------

	AC_CHECK_LIB(m, cos, VORBIS_LIBS="-lm", VORBIS_LIBS="")
	AC_CHECK_LIB(pthread, pthread_create, pthread_lib="-lpthread", :)

	PKG_PROG_PKG_CONFIG

	HAVE_OGG=no
	if test "x$PKG_CONFIG" != "x"
	then
	PKG_CHECK_MODULES(OGG, ogg >= 1.0, HAVE_OGG=yes, HAVE_OGG=no)
	fi
	if test "x$HAVE_OGG" = "xno"
	then
	dnl fall back to the old school test
	XIPH_PATH_OGG(, AC_MSG_ERROR(must have Ogg installed!))
	libs_save=$LIBS
	LIBS="$OGG_LIBS $VORBIS_LIBS"
	AC_CHECK_FUNC(oggpack_writealign, , AC_MSG_ERROR(Ogg >= 1.0 required !))
	LIBS=$libs_save
	fi

	dnl --------------------------------------------------
	dnl Check for library functions
	dnl --------------------------------------------------

	AC_FUNC_ALLOCA
	AC_FUNC_MEMCMP

	dnl --------------------------------------------------
	dnl Do substitutions
	dnl --------------------------------------------------

	AC_SUBST(VORBIS_LIBS)
	AC_SUBST(DEBUG)
	AC_SUBST(PROFILE)
	AC_SUBST(pthread_lib)

	dnl The following line causes the libtool distributed with the source
	dnl to be replaced if the build system has a more recent version.
	AC_SUBST(LIBTOOL_DEPS)

	AC_OUTPUT([
	Makefile
	m4/Makefile
	lib/Makefile
	lib/modes/Makefile
	lib/books/Makefile
	lib/books/coupled/Makefile
	lib/books/uncoupled/Makefile
	lib/books/floor/Makefile
	doc/Makefile doc/vorbisfile/Makefile doc/vorbisenc/Makefile
	doc/Doxyfile
	include/Makefile include/vorbis/Makefile
	examples/Makefile
	test/Makefile
	vq/Makefile
	libvorbis.spec
	vorbis.pc
	vorbisenc.pc
	vorbisfile.pc
	vorbis-uninstalled.pc
	vorbisenc-uninstalled.pc
	vorbisfile-uninstalled.pc
	])