diff --git a/checkin_notes b/checkin_notes
index abc67795aa..27b91e8280 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -12377,3 +12377,13 @@ David  19 Dec 2007
             list_new_users.php
             manage_user.php
             sample_server_status.php
+
+Charlie 19 Dec 07
+    - Mac: make build scripts more robust.
+ 
+    mac_build/
+        buildcurl.sh
+        buildjpeg.sh
+        BuildMacBOINC.sh
+        buildWxMac.sh
+   
\ No newline at end of file
diff --git a/mac_build/BuildMacBOINC.sh b/mac_build/BuildMacBOINC.sh
index 5471852d1e..59fe089ea4 100644
--- a/mac_build/BuildMacBOINC.sh
+++ b/mac_build/BuildMacBOINC.sh
@@ -22,7 +22,7 @@
 #
 ##
 # Script for building Macintosh BOINC Manager, Core Client and libraries
-# by Charlie Fenton 12/4/07
+# by Charlie Fenton 12/19/07
 # with thanks to Reinhard Prix for his assistance
 ##
 
@@ -145,6 +145,8 @@ fi
 
 echo ""
 
+export DEVELOPER_SDK_DIR="/Developer/SDKs"
+
 xcodebuild -project boinc.xcodeproj ${targets} -configuration ${style} ${doclean} build
 
 return $?
diff --git a/mac_build/buildWxMac.sh b/mac_build/buildWxMac.sh
index eb81ee1901..5ada233d29 100644
--- a/mac_build/buildWxMac.sh
+++ b/mac_build/buildWxMac.sh
@@ -23,7 +23,7 @@
 # Script to build the wxMac-2.8.7 library for BOINC as a Universal Binary
 #
 # by Charlie Fenton    7/21/06
-# Updated for wx-Mac 2.8.7 12/17/07
+# Updated for wx-Mac 2.8.7 12/19/07
 
 #
 ## In Terminal, CD to the wxMac-2.8.7 directory.
@@ -44,6 +44,7 @@ fi
 if [ "$1" != "-clean" ] && [ -f src/build/Deployment/libwx_mac_static.a ]; then
     echo "Deployment libwx_mac_static.a already built"
 else
+     export DEVELOPER_SDK_DIR="/Developer/SDKs"
      xcodebuild -project src/wxWindows.xcodeproj -target static -configuration Deployment $doclean build GCC_VERSION_ppc=4.0 MACOSX_DEPLOYMENT_TARGET_ppc=10.3 SDKROOT_ppc=/Developer/SDKs/MacOSX10.3.9.sdk GCC_VERSION_i386=4.0 MACOSX_DEPLOYMENT_TARGET_i386=10.4 SDKROOT_i386=/Developer/SDKs/MacOSX10.4u.sdk ARCHS="i386 ppc" OTHER_CPLUSPLUSFLAGS="-fvisibility=hidden -fvisibility-inlines-hidden"
 
 if [  $? -ne 0 ]; then return 1; fi
@@ -52,7 +53,8 @@ fi
 if [ "$1" != "-clean" ] && [ -f src/build/Development/libwx_mac_static.a ]; then
     echo "Development libwx_mac_static.a already built"
 else
-    xcodebuild -project src/wxWindows.xcodeproj -target static -configuration Development $doclean build GCC_VERSION_ppc=4.0 MACOSX_DEPLOYMENT_TARGET_ppc=10.3 SDKROOT_ppc=/Developer/SDKs/MacOSX10.3.9.sdk GCC_VERSION_i386=4.0 MACOSX_DEPLOYMENT_TARGET_i386=10.4 SDKROOT_i386=/Developer/SDKs/MacOSX10.4u.sdk OTHER_CPLUSPLUSFLAGS="-fvisibility=hidden -fvisibility-inlines-hidden"
+     export DEVELOPER_SDK_DIR="/Developer/SDKs"
+     xcodebuild -project src/wxWindows.xcodeproj -target static -configuration Development $doclean build GCC_VERSION_ppc=4.0 MACOSX_DEPLOYMENT_TARGET_ppc=10.3 SDKROOT_ppc=/Developer/SDKs/MacOSX10.3.9.sdk GCC_VERSION_i386=4.0 MACOSX_DEPLOYMENT_TARGET_i386=10.4 SDKROOT_i386=/Developer/SDKs/MacOSX10.4u.sdk OTHER_CPLUSPLUSFLAGS="-fvisibility=hidden -fvisibility-inlines-hidden"
 ## The above line does Development build for only the native architecture.  
 ## Use line below instead for Universal Binary Development build
 ##    xcodebuild -project src/wxWindows.xcodeproj -target static -configuration Development $doclean build MACOSX_DEPLOYMENT_TARGET_ppc=10.3 SDKROOT_ppc=/Developer/SDKs/MacOSX10.3.9.sdk MACOSX_DEPLOYMENT_TARGET_i386=10.4 SDKROOT_i386=/Developer/SDKs/MacOSX10.4u.sdk ARCHS="i386 ppc" OTHER_CPLUSPLUSFLAGS="-fvisibility=hidden -fvisibility-inlines-hidden"