diff --git a/checkin_notes b/checkin_notes
index 3bc00005d6..dfaf9938a0 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -230,7 +230,7 @@ David  Jan 8 2008
         app_control.C
 
 Charlie Jan 8 2008
-    - Mac: additional error checking in build script.
+    - Mac: additional error checking in build script; fix url in error message.
     
     mac_build/
         BuildMacBOINC.sh
diff --git a/mac_build/BuildMacBOINC.sh b/mac_build/BuildMacBOINC.sh
index 3fb8eee8c2..1fb909d87d 100644
--- a/mac_build/BuildMacBOINC.sh
+++ b/mac_build/BuildMacBOINC.sh
@@ -109,7 +109,7 @@ major=`echo $version | sed 's/\([0-9]*\)[.].*/\1/' `;
 
 if [ "$major" -lt "8" ]; then
     echo "ERROR: Building BOINC requires System 10.4 or later.  For details, see build instructions at"
-    echo "boinc/mac_build/HowToBuildBOINC_XCode.rtf or http://boinc.berkeley.edu/mac_build.html"
+    echo "boinc/mac_build/HowToBuildBOINC_XCode.rtf or http://boinc.berkeley.edu/trac/wiki/MacBuild"
     return 1
 fi
     
@@ -121,13 +121,13 @@ fi
 
 if [ ! -d /Developer/SDKs/MacOSX10.3.9.sdk/ ]; then
     echo "ERROR: System 10.3.9 SDK is missing.  For details, see build instructions at"
-    echo "boinc/mac_build/HowToBuildBOINC_XCode.rtf or http://boinc.berkeley.edu/mac_build.html"
+    echo "boinc/mac_build/HowToBuildBOINC_XCode.rtf or http://boinc.berkeley.edu/trac/wiki/MacBuild"
     return 1
 fi
 
 if [ ! -d /Developer/SDKs/MacOSX10.4u.sdk/ ]; then
     echo "ERROR: System 10.4u SDK is missing.  For details, see build instructions at"
-    echo "boinc/mac_build/HowToBuildBOINC_XCode.rtf or http://boinc.berkeley.edu/mac_build.html"
+    echo "boinc/mac_build/HowToBuildBOINC_XCode.rtf or http://boinc.berkeley.edu/trac/wiki/MacBuild"
     return 1
 fi