Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
cairo
fontconfig
freetype
glib
libpng
pixman
pkg-config
ttfautohint
I'm trying to link these unlinked kegs but when I run brew link on these I get
Linking /usr/local/Cellar/cairo/1.14.6_1... 0 symlinks created
Linking /usr/local/Cellar/fontconfig/2.11.1_2... 0 symlinks created
Linking /usr/local/Cellar/freetype/2.6.3... 0 symlinks created
Linking /usr/local/Cellar/glib/2.46.2... 0 symlinks created
Linking /usr/local/Cellar/libpng/1.6.21... 0 symlinks created
Linking /usr/local/Cellar/pixman/0.34.0... 0 symlinks created
Linking /usr/local/Cellar/pkg-config/0.29.1... 0 symlinks created
Linking /usr/local/Cellar/ttfautohint/HEAD... 0 symlinks created
OS X 10.11.4
I'm trying to link these unlinked kegs but when I run brew link on these I get