diff --git a/profile b/profile
index cbb9674..a136c25 100755
--- a/profile
+++ b/profile
@@ -21,21 +21,28 @@ test -f "${HOME}/.dotfiles/rc.py" && \
     export PYTHONSTARTUP="${HOME}/.dotfiles/rc.py"
 #export PYTHONPATH="~/.local/share/lib/python3.2/site-packages"
 
+export GEM_HOME="$HOME/.local/lib/gems"
+export PATH="$PATH:$HOME/.local/lib/gems/bin"
+export RUBYLIB="$RUBYLIB:$HOME/.local/lib/gems/lib"
+
 __add_to_path(){
     for p in "$@"
     do
         echo $PATH | grep -E "^$p:|:$p:|:$p$" >/dev/null 2>&1 || \
-            PATH="${PATH}:$p"
+            PATH="$p:${PATH}"
     done
 }
 # export PATH="${PATH}:${HOME}/bin"
 __add_to_path ${HOME}/.local/bin /c/mingw/bin /c/mingw/msys/1.0/bin
 
-# it is not so good
-# http://archive.linux.or.jp/JF/JFdocs/Program-Library-HOWTO/shared-libraries.html
+# # it is not so good
+# # http://archive.linux.or.jp/JF/JFdocs/Program-Library-HOWTO/shared-libraries.html
+# # http://superuser.com/questions/324613/installing-a-library-locally-in-home-directory-but-program-doesnt-recognize-it
+# without this ENV i cannot run tmux. another way is to use --disable-shared
+# when building tmux
 export LD_LIBRARY_PATH="$HOME/.local/lib:$LD_LIBRARY_PATH"
-# or LDFLAGS
-export CPPFLAGS="$CFLAGS -I$HOME/.local/include"
+# this should be used when ./configure
+#export CFLAGS="$CFLAGS -I$HOME/.local/include"
 
 type setterm >/dev/null 2>&1 && setterm -blank 30 -powersave on # -powerdown 10
 # in my environment powerdown does not work