mplayer-plugin build failure

[kalin mintchev]

hi all...

mplayer-plugin build failure. here is where it stops and the log is attached.
what to do?  thanks....

configure: Determining mozilla/firefox packages to link against
checking for pkg-config... /usr/local/bin/pkg-config
checking for firefox-plugin... gnome-config: not found
gnome-config: not found
configure: WARNING: firefox-plugin not found
checking for firefox-plugin... gnome-config: not found
gnome-config: not found
configure: WARNING: firefox-plugin not found
checking for seamonkey-plugin... gnome-config: not found
gnome-config: not found
configure: WARNING: seamonkey-plugin not found
configure: error: Unable to find mozilla or firefox development files
===>  Script "configure" failed unexpectedly.