+if test -d /prereq/zlib-1.2.3; then
+ ZLIB_LOCATION=/prereq/zlib-1.2.3
+ echo zlib found in $ZLIB_LOCATION
+else
+ echo Building zlib-1.2.3...
+ cd zlib-1.2.3
+ ./configure --prefix=$ZLIB_LOCATION
+ make
+ make install
+ cd ..
+fi
+echo ==================================================