diff --git a/checkin_notes b/checkin_notes
index 04060946e9..d3ab583178 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -12365,3 +12365,10 @@ Rom    29 Sept 2005
     clientgui/wizards/
         AccountInfoPage.cpp
         ProjectProcessingPage.cpp
+
+Reinhard 	29 Sept 2005
+    - added forgotten Mac-sources 'mac_backtrace.[Ch]' to build
+
+    lib/
+       Makefile.am
+
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 0c98b1d268..a5f4bd6d5f 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -33,6 +33,14 @@ lib_LIBRARIES = libboinc.a
 
 EXTRA_DIST = *.h *.C
 
+if OS_DARWIN
+mac_sources = 			\
+	mac_backtrace.C 	\
+	mac_backtrace.h 
+else
+mac_sources = 
+endif
+
 libboinc_a_SOURCES = \
     app_ipc.C \
     base64.C \
@@ -56,7 +64,10 @@ libboinc_a_SOURCES = \
     prefs.C \
     proxy_info.C \
     shmem.C \
-    util.C
+    util.C	\
+	$(mac_sources)
+
+
 
 include_HEADERS = 	\
     app_ipc.h 		\