do not uninstall leaves when pupgrade, it removes packages that are needed for compile

bashrc

@@ -190,7 +190,7 @@ null type apt-get && \
     alias aupgrade="sudo apt-get autoremove --yes && sudo apt-get update --yes && sudo apt-get upgrade --yes"
 null type port && \
     alias port="port -v"
-    alias pupgrade="sudo port -v selfupdate && { sudo port -v upgrade outdated; sudo port -v uninstall leaves; }"
+    alias pupgrade="sudo port -v selfupdate && { sudo port -v upgrade outdated; }"
 
 if iscygwin; then
     null type windate || alias windate="/c/Windows/System32/cmd.exe //c 'echo %DATE%-%TIME%'"