songcq:

hi,

this is the output:

Configuring xmobar-0.9... Warning: This package indirectly depends on multiple versions of the same package. This is highly likely to cause a compile failure. package X11-xft-0.3 requires utf8-string-0.3.3 package xmobar-0.9 requires utf8-string-0.3.4 Preprocessing executables for xmobar-0.9... Building xmobar-0.9... Linking dist/build/xmobar/xmobar ... /usr/bin/ld: cannot find -lHSutf8-string-0.3.3

different version of utf8-string are required. how to fix it?

ghc-pkg unregister utf8-string-0.3.3 then rebuild X11-xft and xmobar against only utf8-string-0.3.4. If you're on Arch, sergej broke utf8-string when he upgraded, but that was fixed 8 hours ago. -- Don