diff --git a/mac_build/buildWxMac.sh b/mac_build/buildWxMac.sh
index f8d3117979..371760dfb7 100644
--- a/mac_build/buildWxMac.sh
+++ b/mac_build/buildWxMac.sh
@@ -32,7 +32,7 @@
 # Disable all wxWidgets debug support in Release build (revert 3/6/14 change) 5/29/14
 # Fix wxListCtrl flicker when resizing columns in wxCocoa 3.0.0 6/13/14
 # Revise fix for wxListCtrl flicker to match the fix in wxWidgets trunk 6/19/14
-# Build 64-bit library (temporarily build both 32-bit and 64-bit libraries) 10/18/17
+# Build 64-bit library (temporarily build both 32-bit and 64-bit libraries) 10/22/17
 #
 ## This script requires OS 10.6 or later
 ##
@@ -180,17 +180,26 @@ if [ $? -eq 0 ]; then
 fi
 
 retval=0
+alreadyBuilt=0
 
 if [ "${doclean}" != "clean" ] && [ -f "${libPathRel}/libwx_osx_cocoa_static.a" ]; then
+    lipo "${libPathRel}/libwx_osx_cocoa_static.a" -verify_arch i386 x86_64
+    if [ $? -eq 0 ]; then
+        alreadyBuilt=1
+    else
+        # already built but not for correct architectures
+        doclean="clean"
+    fi
+fi
+
+if [ alreadyBuilt -eq 1 ]; then
     cwd=$(pwd)
     dirname=${cwd##*/}
     echo "${dirname} Release libwx_osx_cocoa_static.a already built"
 else
-
-##    export DEVELOPER_SDK_DIR="/Developer/SDKs"
     ## We must override some of the build settings in wxWindows.xcodeproj
     ## For wxWidgets 3.0.0 through 3.1.0 (at least) we must use legacy WebKit APIs
-    ## for x85_64, so we must define WK_API_ENABLED=0
+    ## for x86_64, so we must define WK_API_ENABLED=0
     xcodebuild -project build/osx/wxcocoa.xcodeproj -target static -configuration Release $doclean build ARCHS="i386 x86_64" ONLY_ACTIVE_ARCH=="NO" OTHER_CFLAGS="-Wall -Wundef -fno-strict-aliasing -fno-common -DWK_API_ENABLED=0 -DHAVE_LOCALTIME_R=1 -DHAVE_GMTIME_R=1 -DwxUSE_UNICODE=1 -DwxDEBUG_LEVEL=0 -DNDEBUG -fvisibility=hidden" OTHER_CPLUSPLUSFLAGS="-Wall -Wundef -fno-strict-aliasing -fno-common -DWK_API_ENABLED=0 -DHAVE_LOCALTIME_R=1 -DHAVE_GMTIME_R=1 -DwxUSE_UNICODE=1 -DwxDEBUG_LEVEL=0 -DNDEBUG -fvisibility=hidden -fvisibility-inlines-hidden" GCC_PREPROCESSOR_DEFINITIONS="WXBUILDING __WXOSX_COCOA__ __WX__ wxUSE_BASE=1 _FILE_OFFSET_BITS=64 _LARGE_FILES MACOS_CLASSIC __WXMAC_XCODE__=1 SCI_LEXER WX_PRECOMP=1 wxUSE_UNICODE_UTF8=1 wxUSE_UNICODE_WCHAR=0" | $beautifier; retval=${PIPESTATUS[0]}
     if [ ${retval} -ne 0 ]; then return 1; fi
     if [ "x${lprefix}" != "x" ]; then
@@ -208,15 +217,25 @@ if [ "${nodebug}" = "yes" ]; then
     return 0
 fi
 
+alreadyBuilt=0
 if [ "${doclean}" != "clean" ] && [ -f "${libPathDbg}/libwx_osx_cocoa_static.a" ]; then
+    lipo "${libPathDbg}/libwx_osx_cocoa_static.a" -verify_arch i386 x86_64
+    if [ $? -eq 0 ]; then
+        alreadyBuilt=1
+    else
+        # already built but not for correct architectures
+        doclean="clean"
+    fi
+fi
+
+if [ alreadyBuilt -eq 1 ]; then
     cwd=$(pwd)
     dirname=${cwd##*/}
     echo "${dirname} Debug libwx_osx_cocoa_static.a already built"
 else
-##    export DEVELOPER_SDK_DIR="/Developer/SDKs"
     ## We must override some of the build settings in wxWindows.xcodeproj
     ## For wxWidgets 3.0.0 through 3.1.0 (at least) we must use legacy WebKit APIs
-    ## for x85_64, so we must define WK_API_ENABLED=0
+    ## for x86_64, so we must define WK_API_ENABLED=0
     xcodebuild -project build/osx/wxcocoa.xcodeproj -target static -configuration Debug $doclean build ARCHS="i386 x86_64" ONLY_ACTIVE_ARCH=="NO" OTHER_CFLAGS="-Wall -Wundef -fno-strict-aliasing -fno-common -DWK_API_ENABLED=0 -DHAVE_LOCALTIME_R=1 -DHAVE_GMTIME_R=1 -DwxUSE_UNICODE=1 -DDEBUG -fvisibility=hidden" OTHER_CPLUSPLUSFLAGS="-Wall -Wundef -fno-strict-aliasing -fno-common -DWK_API_ENABLED=0 -DHAVE_LOCALTIME_R=1 -DHAVE_GMTIME_R=1 -DwxUSE_UNICODE=1 -DDEBUG -fvisibility=hidden -fvisibility-inlines-hidden" GCC_PREPROCESSOR_DEFINITIONS="WXBUILDING __WXOSX_COCOA__ __WX__ wxUSE_BASE=1 _FILE_OFFSET_BITS=64 _LARGE_FILES MACOS_CLASSIC __WXMAC_XCODE__=1 SCI_LEXER WX_PRECOMP=1 wxUSE_UNICODE_UTF8=1 wxUSE_UNICODE_WCHAR=0" | $beautifier; retval=${PIPESTATUS[0]}
     if [ ${retval} -ne 0 ]; then return 1; fi
     if [ "x${lprefix}" != "x" ]; then
diff --git a/mac_build/buildsqlite3.sh b/mac_build/buildsqlite3.sh
index f5cf975f1d..e59df6e046 100644
--- a/mac_build/buildsqlite3.sh
+++ b/mac_build/buildsqlite3.sh
@@ -25,7 +25,7 @@
 # Updated 2/11/14 for sqlite 3.8.3
 # Updated 1/5/16 for sqlite 3.9.2
 # Updated 3/2/16 for sqlite 3.11.0
-# Updated 10/18/17 to build 64-bit library (temporarily build both 32-bit and 64-bit libraries) 
+# Updated 10/22/17 to build 64-bit library (temporarily build both 32-bit and 64-bit libraries)
 #
 ## This script requires OS 10.6 or later
 #
@@ -67,10 +67,16 @@ done
 
 if [ "${doclean}" != "yes" ]; then
     if [ -f "${libPath}/libsqlite3.a" ]; then
-        cwd=$(pwd)
-        dirname=${cwd##*/}
-        echo "${dirname} already built"
-        return 0
+        lipo "${libPath}/libsqlite3.a" -verify_arch i386 x86_64
+        if [ $? -eq 0 ]; then
+            cwd=$(pwd)
+            dirname=${cwd##*/}
+            echo "${dirname} already built"
+            return 0
+        else
+            # already built but not for correct architectures
+            doclean="yes"
+        fi
     fi
 fi