LDLAGS=LDFLAGS-L/home/ewijaya/MyBioTool/libstree-0.4.2/lib
....
CFLAGS=-I/home/monkfan/MyBioTool/libstree-0.4.2/include

##</code><code>##

prompt> export LDFLAGS="-L $HOME/MyBioTool/libstree-0.4.2/lib"
prompt> printenv LDFLAGS
 |---> this command should give you:
                  -L $HOME/MyBioTool/libstree-0.4.2/lib