This patch is taken from the Arch Linux User Repository, see:
https://aur.archlinux.org/packages/sdl_sound-patched-hg/

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>

diff -ru SDL_sound.orig/playsound/physfsrwops.h SDL_sound/playsound/physfsrwops.h
--- SDL_sound.orig/playsound/physfsrwops.h	2014-01-11 06:28:35.494936000 +0100
+++ SDL_sound/playsound/physfsrwops.h	2014-01-11 06:31:38.315675483 +0100
@@ -29,6 +29,11 @@
 extern "C" {
 #endif
 
+/* renamed in physfs dev, add alias */
+#ifdef PHYSFS_DECL
+#define __EXPORT__ PHYSFS_DECL
+#endif
+
 /**
  * Open a platform-independent filename for reading, and make it accessible
  *  via an SDL_RWops structure. The file will be closed in PhysicsFS when the
@@ -77,6 +82,11 @@
  */
 __EXPORT__ SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle);
 
+/* renamed in physfs dev, remove alias */
+#ifdef PHYSFS_DECL
+#undef __EXPORT__
+#endif
+
 #ifdef __cplusplus
 }
 #endif