https://bugs.gentoo.org/372413
Based on debian patch by: Barry deFreese <bdefreese@debian.org>

While adding pkg-config for portaudio, also use it for the rest
and remove unused X libraries.
--- a/Transcend/Makefile.GnuLinuxX86
+++ b/Transcend/Makefile.GnuLinuxX86
@@ -20,3 +20,3 @@
 
-PLATFORM_COMPILE_FLAGS = -DLINUX
+PLATFORM_COMPILE_FLAGS = $(shell $(PKG_CONFIG) --cflags gl glut glu portaudio-2.0)
 
@@ -24,3 +24,3 @@
 # also need portaudio library (which in turn needs pthreads)
-PLATFORM_LINK_FLAGS = -L/usr/X11R6/lib -lGL -lglut -lGLU -lX11 -lXi -lXext -lXmu ${ROOT_PATH}/Transcend/portaudio/lib/libportaudio.a -lpthread
+PLATFORM_LINK_FLAGS = $(shell $(PKG_CONFIG) --libs gl glut glu portaudio-2.0)
 
--- a/Transcend/game/SoundPlayer.cpp
+++ b/Transcend/game/SoundPlayer.cpp
@@ -49,5 +49,7 @@
 // callback passed into portaudio
-static int portaudioCallback( void *inputBuffer, void *outputBuffer,
+int portaudioCallback( const void *inputBuffer, void *outputBuffer,
                               unsigned long framesPerBuffer,
-                              PaTimestamp outTime, void *userData ) {
+                              const PaStreamCallbackTimeInfo *outTime,
+                              PaStreamCallbackFlags statusFlags,
+                              void *userData ) {
 
@@ -149,17 +151,9 @@
     
-        error = Pa_OpenStream(
+        error = Pa_OpenDefaultStream(
             &mAudioStream,
-            paNoDevice,// default input device 
             0,              // no input 
-            paFloat32,  // 32 bit floating point input 
-            NULL,
-            Pa_GetDefaultOutputDeviceID(),
             2,          // stereo output 
             paFloat32,      // 32 bit floating point output 
-            NULL,
             mSampleRate,
             1024,   // frames per buffer
-            0,    // number of buffers, if zero then use default minimum 
-            paClipOff, // we won't output out of range samples so
-                       // don't bother clipping them 
             portaudioCallback,
--- a/Transcend/game/SoundPlayer.h
+++ b/Transcend/game/SoundPlayer.h
@@ -48,4 +48,3 @@
 
-#include "Transcend/portaudio/pa_common/portaudio.h"
-#include "Transcend/portaudio/pablio/pablio.h"
+#include <portaudio.h>
 
@@ -207,3 +206,3 @@
         
-        PortAudioStream *mAudioStream;
+        PaStream *mAudioStream;
 
--- a/Transcend/game/SoundPlayerActive.h
+++ b/Transcend/game/SoundPlayerActive.h
@@ -18,4 +18,3 @@
 
-#include "Transcend/portaudio/pa_common/portaudio.h"
-#include "Transcend/portaudio/pablio/pablio.h"
+#include <portaudio.h>