Fix build with partially-installed alsa-lib

Fix build of alsa-utils package with a partially installed alsa-lib,
e.g. without ramwidi or sequencer support.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

Makefile.am

@@ -1,16 +1,25 @@
 INCLUDES=-I$(top_srcdir)/include
+
+SUBDIRS = include alsactl utils m4 po
 if ALSAMIXER
-ALSAMIXER_DIR=alsamixer
+SUBDIRS += alsamixer
-else
+endif
-ALSAMIXER_DIR=
+if HAVE_MIXER
+SUBDIRS += amixer
+endif
+if HAVE_RAWMIDI
+SUBDIRS += amidi
 endif
 if ALSACONF
-ALSACONF_DIR=alsaconf
+SUBDIRS += alsaconf
-else
-ALSACONF_DIR=
 endif
-SUBDIRS= include alsactl $(ALSACONF_DIR) $(ALSAMIXER_DIR) amidi amixer \
+if HAVE_PCM
-	 aplay iecset seq speaker-test utils m4 po
+SUBDIRS += aplay iecset speaker-test
+endif
+if HAVE_SEQ
+SUBDIRS += seq
+endif
+
 EXTRA_DIST= TODO gitcompile
 AUTOMAKE_OPTIONS=foreign
 ACLOCAL_AMFLAGS = -I m4

configure.in

@@ -29,10 +29,27 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AM_PATH_ALSA(1.0.16)
 
+dnl Check components
+AC_CHECK_HEADERS([alsa/pcm.h], [have_pcm="yes"], [have_pcm="no"],
+  [#include <alsa/asoundlib.h>])
+AC_CHECK_HEADERS([alsa/mixer.h], [have_mixer="yes"], [have_mixer="no"],
+  [#include <alsa/asoundlib.h>])
+AC_CHECK_HEADERS([alsa/rawmidi.h], [have_rawmidi="yes"], [have_rawmidi="no"],
+  [#include <alsa/asoundlib.h>])
+AC_CHECK_HEADERS([alsa/seq.h], [have_seq="yes"], [have_seq="no"],
+  [#include <alsa/asoundlib.h>])
+
+AM_CONDITIONAL(HAVE_PCM, test "$have_pcm" = "yes")
+AM_CONDITIONAL(HAVE_MIXER, test "$have_mixer" = "yes")
+AM_CONDITIONAL(HAVE_RAWMIDI, test "$have_rawmidi" = "yes")
+AM_CONDITIONAL(HAVE_SEQ, test "$have_seq" = "yes")
+
 dnl Disable alsamixer
 CURSESINC=""
 CURSESLIB=""
 CURSES_CFLAGS=""
+alsamixer=
+if test "$have_mixer" = "yes"; then
 AC_ARG_ENABLE(alsamixer,
      [  --disable-alsamixer     Disable alsamixer compilation],
      [case "${enableval}" in
@@ -40,6 +57,7 @@ AC_ARG_ENABLE(alsamixer,
        no)  alsamixer=false ;;
        *) AC_MSG_ERROR(bad value ${enableval} for --enable-alsamixer) ;;
      esac],[alsamixer=true])
+fi
 AM_CONDITIONAL(ALSAMIXER, test x$alsamixer = xtrue)
 
 dnl Disable alsaconf