Brew doctor for node install failure on Lion

gistfile1.txt

Grants-MacBook-Air:Time Machine grant$ brew doctor
Warning: Unbrewed .la files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .la files:
    /usr/local/lib/libfreetype.la    /usr/local/lib/libjpeg.la    /usr/local/lib/libosxfuse_i32.la    /usr/local/lib/libosxfuse_i64.la    /usr/local/lib/libpng12.la    /usr/local/lib/libpng14.la    /usr/local/lib/libpng15.la
Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .pc files:
    /usr/local/lib/pkgconfig/freetype2.pc    /usr/local/lib/pkgconfig/libpng12.pc    /usr/local/lib/pkgconfig/libpng14.pc    /usr/local/lib/pkgconfig/libpng15.pc    /usr/local/lib/pkgconfig/osxfuse.pc    /usr/local/lib/pkgconfig/zlib.pc
Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected static libraries:
    /usr/local/lib/libfreetype.a    /usr/local/lib/libpng12.a    /usr/local/lib/libpng14.a    /usr/local/lib/libpng15.a    /usr/local/lib/libz.a