./configure --enable-gtk1 --with-mozilla-home=/usr/lib/firefox --with-gecko-sdk=/opt/xulrunner-sdk/
checking for g++... g++
checking for C++ compiler default output file name... a.out
checking whether the C++ compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking for gcc... gcc
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for a BSD-compatible install... /usr/bin/install -c
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
Using new (v1.7+) gecko-sdk
checking for xpidl... no
configure: error: xpidl compiler not found