diff --git a/Jenkinsfile b/Jenkinsfile
index 9e75d34dc4c..bb8a11da839 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -255,7 +255,16 @@ pipeline {
 													sh build.sh clean
 													sh build.sh -gtk4 checklibs install-pi-only
 												elif [[ ${PLATFORM} == cocoa.macosx.* ]]; then
+													xcode-select --print-path
+													xcode-select --version
+													softwareupdate --list
+													softwareupdate --history
+													xcodebuild -version
+													xcodebuild -showsdks
 													sh build.sh install 
+													for f in libs/*; do
+														vtool -show ${f}
+													done
 												else
 													echo "Unexpected build platform ${PLATFORM}"
 													exit 1
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/build.sh b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/build.sh
index 95654493c5d..8b20f17cb33 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/build.sh	
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/library/build.sh	
@@ -29,6 +29,11 @@ elif [ "x${MODEL}" = "xarm64" ] || [ "x${MODEL}" = "xaarch64" ]; then
 	fi
 fi
 
-export MACOSX_DEPLOYMENT_TARGET=10.10
+#TODO: increment this?
+export MACOSX_DEPLOYMENT_TARGET=10.15
+export CLANG_ENABLE_OBJC_WEAK = YES
+export CLANG_WARN_UNGUARDED_AVAILABILITY = YES
+export GCC_TREAT_WARNINGS_AS_ERRORS = YES
+
 
 make -f make_macosx.mak $1 $2 $3 $4 $5 $6 $7 $8 $9
\ No newline at end of file