explorer: Build on Darwin versions prior to 8.0.

configure.ac

@@ -1016,8 +1016,12 @@ case $host_os in
     dnl declare needed frameworks
     AC_SUBST(COREFOUNDATIONLIB,"-framework CoreFoundation")
     AC_SUBST(IOKITLIB,"-framework IOKit -framework CoreFoundation")
-    AC_SUBST(DISKARBITRATIONLIB,"-framework DiskArbitration -framework CoreFoundation")
     AC_SUBST(LDEXECFLAGS,["-image_base 0x7bf00000 -Wl,-segaddr,WINE_DOS,0x00000000,-segaddr,WINE_SHARED_HEAP,0x7f000000"])
+    if test "$ac_cv_header_DiskArbitration_DiskArbitration_h" = "yes"
+    then
+        dnl DiskArbitration API is not public on Darwin < 8.0, use it only if header found
+        AC_SUBST(DISKARBITRATIONLIB,"-framework DiskArbitration -framework CoreFoundation")
+    fi
     if test "$ac_cv_header_CoreAudio_CoreAudio_h" = "yes" -a "$ac_cv_header_AudioUnit_AudioUnit_h" = "yes"
     then
         dnl CoreServices needed by AudioUnit

programs/explorer/diskarb.c

@@ -37,7 +37,7 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(explorer);
 
-#ifdef __APPLE__
+#ifdef HAVE_DISKARBITRATION_DISKARBITRATION_H
 
 #include <DiskArbitration/DiskArbitration.h>
 
@@ -133,11 +133,11 @@ void initialize_diskarbitration(void)
     CloseHandle( handle );
 }
 
-#else  /* __APPLE__ */
+#else  /*  HAVE_DISKARBITRATION_DISKARBITRATION_H */
 
 void initialize_diskarbitration(void)
 {
-    WINE_TRACE( "Skipping on non-Apple platform\n" );
+    WINE_TRACE( "Skipping, Disk Arbitration support not compiled in\n" );
 }
 
-#endif  /* __APPLE__ */
+#endif  /* HAVE_DISKARBITRATION_DISKARBITRATION_H */