alsa-tools/sb16_csp/configure.in

AC_INIT(cspctl.c)
AM_INIT_AUTOMAKE(cspctl, 0.2.0)
AC_PROG_CC
AC_PROG_INSTALL
AC_HEADER_STDC
AM_PATH_ALSA(1.0.0)

dnl kernel header files
AC_MSG_CHECKING(for kernel header files)
AC_ARG_WITH(kernel,
  [  --with-kernel=ver       specify kernel version (for example 2.5.5-pre1)],
  [kerneldir="$withval"], [kerneldir=""])
if test "$kerneldir" != "" -a -r "/lib/modules/$kerneldir/build/include/sound"; then
  kerneldir="/lib/modules/$kerneldir/build/include"
  AC_MSG_RESULT($kerneldir)
else
  if test -z "$kerneldir"; then
    AC_MSG_RESULT("not specified")
  else
    AC_MSG_RESULT("directory /lib/modules/$kerneldir/build/include/sound not found")
  fi
  kerneldir=""
fi

dnl path for sound/asound.h
AC_MSG_CHECKING(for directory with ALSA kernel headers)
AC_ARG_WITH(soundbase,
  [  --with-soundbase=dir    specify base directory with kernel sound headers (optional)],
  [soundbasedir="$withval"], [soundbasedir="$kerneldir"])
if test "$soundbasedir" != "" -a -r "$soundbasedir/sound" ; then
  ALSA_CFLAGS="$ALSA_CFLAGS -I$soundbasedir"
  CFLAGS="$CFLAGS -I$soundbasedir"
  AC_MSG_RESULT($ALSA_CFLAGS)
else
  if test "x$prefix" != xNONE; then
    aprefix=$prefix
  else
    aprefix=$ac_default_prefix
  fi
  if test -z "$soundbasedir" -a -r "$aprefix/include/sound"; then
    ALSA_CFLAGS="$ALSA_CFLAGS -I$aprefix/include"
    CFLAGS="$CFLAGS -I$aprefix/include"
    AC_MSG_RESULT($ALSA_CFLAGS)
  else
    AC_MSG_RESULT("not specified - using C compilator defaults")
  fi
fi

CFLAGS="$CFLAGS $ALSA_CFLAGS"
LDFLAGS="$LDFLAGS $ALSA_LIBS"

AC_OUTPUT(Makefile)