diff --git a/platform/Makefile.am b/platform/Makefile.am
index 1b1a5a0..cae7428 100644
--- a/platform/Makefile.am
+++ b/platform/Makefile.am
@@ -3,27 +3,20 @@ noinst_LTLIBRARIES = libplatform.la
 INCLUDES = -I$(top_srcdir)
 
 if BUILD_BEOS
-BEOS_SRC = beos.cpp
-else
-BEOS_SRC =
-endif
-
-if BUILD_BEOS
-BEOS_EXTRADIST =
-else
-BEOS_EXTRADIST = beos.cpp
-endif
-
-
 libplatform_la_SOURCES =	\
 	unix.c                  \
 	posix.c                 \
-    $(BEOS_SRC)
+    beos.cpp
+else
+libplatform_la_SOURCES =	\
+	unix.c                  \
+	posix.c
+endif
 
 
 EXTRA_DIST =      \
 	skeleton.c    \
 	macclassic.c  \
 	win32.c       \
-    $(BEOS_EXTRADIST)
+    beos.cpp