Error: Target org.macports.configure returned: configure failure: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_gnome_yelp/work/yelp-2.24.0" && ./configure --prefix=/opt/local --with-gecko=firefox " returned error 1
Command output: checking if msgfmt accepts -c... yes
checking for gmsgfmt... /opt/local/bin/msgfmt
checking for xgettext... (cached) /opt/local/bin/xgettext
checking for YELP... yes
checking for gsed... /usr/bin/sed
checking for X... libraries /usr/X11/lib, headers /usr/X11/include
checking whether -R must be followed by a space... no
checking for gethostbyname... yes
checking for connect... yes
checking for remove... yes
checking for shmat... yes
checking for IceConnectionNumber in -lICE... yes
checking for YELP_SEARCH... no
checking for gzopen in -lz... yes
checking for lzmadec_open in -llzmadec... no
checking for bzread in -lbz2... no
checking for BZ2_bzread in -lbz2... yes
checking for gawk... (cached) gawk
checking which gecko to use... firefox
checking manual gecko home set... Package firefox was not found in the pkg-config search path.
Perhaps you should add the directory containing `firefox.pc'
to the PKG_CONFIG_PATH environment variable
No package 'firefox' found
Package firefox-unstable was not found in the pkg-config search path.
Perhaps you should add the directory containing `firefox-unstable.pc'
to the PKG_CONFIG_PATH environment variable
No package 'firefox-unstable' found
checking for compiler -fshort-wchar option... yes
checking whether to enable C++ RTTI... no
checking whether we have a gtk 2 gecko build... configure: error: This program needs a gtk 2 gecko build

Warning: the following items did not execute (for yelp): org.macports.configure
Error: Status 1 encountered during processing.