Attempt to add the rest of the makefile for portmidi

Also, fix a broken(?) include in px_linux_alsa.c.  I don't know if it was actually broken, but it seems like that was wrong.

configure.ac

@@ -350,7 +350,7 @@ dnl Optional library support. Lots of things we could use, but
 dnl can do without if they aren't available.
 dnl-------------------------------------------------------------
 dnl GSTREAMER removed for 2.0.6 release
-LIBRARIES="EXPAT FFMPEG LAME LIBFLAC LIBID3TAG LIBMAD LIBNYQUIST LIBSBSMS LIBSNDFILE LIBSOUNDTOUCH LIBSOXR LIBTWOLAME LIBVAMP LIBVORBIS LV2 PORTAUDIO PORTSMF WIDGETEXTRA"
+LIBRARIES="EXPAT FFMPEG LAME LIBFLAC LIBID3TAG LIBMAD LIBNYQUIST LIBSBSMS LIBSNDFILE LIBSOUNDTOUCH LIBSOXR LIBTWOLAME LIBVAMP LIBVORBIS LV2 PORTAUDIO PORTSMF PORTMIDI WIDGETEXTRA"
 
 AC_MSG_NOTICE([Determining what libraries are available in this tree and on the system])
 
@@ -372,6 +372,7 @@ AUDACITY_CHECKLIB_LIBVORBIS
 AUDACITY_CHECKLIB_LV2
 AUDACITY_CHECKLIB_PORTAUDIO
 AUDACITY_CHECKLIB_PORTSMF
+AUDACITY_CHECKLIB_PORTMIDI
 AUDACITY_CHECKLIB_WIDGETEXTRA
 
 dnl Decide what libraries to build with, and whether to use system or local libraries
@@ -500,6 +501,7 @@ AUDACITY_CONFIG_LIBVORBIS
 AUDACITY_CONFIG_LV2
 AUDACITY_CONFIG_PORTAUDIO
 AUDACITY_CONFIG_PORTSMF
+AUDACITY_CONFIG_PORTMIDI
 AUDACITY_CONFIG_WIDGETEXTRA
 
 dnl--------------------------------------------------------------------------

lib-src/Makefile.am

@@ -163,6 +163,10 @@ if USE_LOCAL_PORTSMF
 SUBDIRS += portsmf
 endif
 
+if USE_LOCAL_PORTMIDI
+SUBDIRS += portmidi
+endif
+
 if USE_LOCAL_SBSMS
 SUBDIRS += sbsms
 endif

lib-src/portmixer/src/px_linux_alsa.c

@@ -41,7 +41,7 @@
 #include <alsa/asoundlib.h>
 
 #include "portaudio.h"
-#include "pa_unix_oss.h"
+#include "pa_linux_alsa.h"
 
 #include "portmixer.h"
 #include "px_mixer.h"

m4/audacity_checklib_portmidi.m4

@@ -0,0 +1,52 @@
+dnl I frankly don't know what's supposed to go there
+# audacity_checklib_portsmf.m4 serial 1
+
+AC_DEFUN([AUDACITY_CHECKLIB_PORTMIDI], [
+
+   AC_ARG_WITH(portmidi,
+               [AS_HELP_STRING([--with-portmidi],
+                               [use PortMIDI for MIDI playback support])],
+               PORTMIDI_ARGUMENT=$withval,
+               PORTMIDI_ARGUMENT="unspecified")
+
+   dnl see if libportsmf is installed on the system
+
+   PKG_CHECK_MODULES(PORTMIDI, portmidi,
+                     PORTMIDI_SYSTEM_AVAILABLE="yes",
+                     PORTMIDI_SYSTEM_AVAILABLE="no")
+
+   if test "$PORTMIDI_SYSTEM_AVAILABLE" = "yes"; then
+      AC_MSG_NOTICE([portmidi library is available as system library])
+   else
+      AC_MSG_NOTICE([portmidi library is NOT available as system library])
+   fi
+
+   AC_CHECK_FILE(${srcdir}/lib-src/portmidi/pm_common/portmidi.h,
+                 PORTMIDI_LOCAL_AVAILABLE="yes",
+                 PORTMIDI_LOCAL_AVAILABLE="no")
+
+   if test "$PORTMIDI_LOCAL_AVAILABLE" = "yes"; then
+      AC_MSG_NOTICE([portmidi library is available in the local tree])
+   else
+      AC_MSG_NOTICE([portmidi library is NOT available in the local tree])
+   fi
+])
+
+AC_DEFUN([AUDACITY_CONFIG_PORTMIDI], [
+   if test "$PORTMIDI_USE_LOCAL" = yes; then
+      PORTMIDI_CFLAGS='-I$(top_srcdir)/lib-src/portmidi'
+      PORTMIDI_LIBS='$(top_builddir)/lib-src/portmidi/libportmidi_s.a'
+      AC_CONFIG_SUBDIRS([lib-src/portmidi])
+   fi
+
+   AC_SUBST([PORTMIDI_CFLAGS])
+   AC_SUBST([PORTMIDI_LIBS])
+
+   AM_CONDITIONAL([USE_PORTMIDI], [test "$PORTMIDI_USE_LOCAL" = yes -o "$PORTMIDI_USE_SYSTEM" = yes])
+   AM_CONDITIONAL([USE_LOCAL_PORTMIDI], [test "$PORTMIDI_USE_LOCAL" = yes])
+
+   if test "$PORTMIDI_USE_LOCAL" = yes -o "$PORTMIDI_USE_SYSTEM" = yes; then
+      AC_DEFINE(USE_PORTMIDI, 1,
+                [Define if midi support should be enabled])
+   fi
+])

src/Makefile.am

@@ -791,6 +791,11 @@ audacity_SOURCES += \
 	$(NULL)
 endif
 
+if USE_PORTMIDI
+audacity_CPPFLAGS += $(PORTMIDI_CFLAGS)
+audacity_LDADD += $(PORTMIDI_LIBS)
+endif
+
 if USE_QUICKTIME
 audacity_CPPFLAGS += $(QUICKTIME_CFLAGS)
 audacity_LDADD += $(QUICKTIME_LIBS)