I tried installing sage 6.4 from several binaries but everytime I started a 
new sage and type in some calculations, the above warning message appears. 
If I re-type the exact calculations again, such warnings disappear. 
Further, it seems that these warnings are related to certain calculations, 
but not all.

Example:
----------------
sage: 2+2
4
sage: x=var('x')
sage: diff(sin(x^2),x,4)
16*x^4*sin(x^2) - 48*x^2*cos(x^2) - 12*sin(x^2)
sage: integral(x*sin(x^2),x)
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
ld: warning: directory not found for option 
'-L/Users/buildslave-sage/slave/sage_git/build/local/lib'
-1/2*cos(x^2)
sage: integral(x*sin(x^2),x)
-1/2*cos(x^2)
sage: t=var('t')
sage: integral(t*sin(t^2),t)
-1/2*cos(t^2)
-----------------

I'm running on a OS X 10.9.5. I tried download binary files from different 
locations, but the same warnings appear. I also tried to install via source 
code, but unfortunately failed.  Many thanks in advance.

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