Building from source on Linux:
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Install required stuff:
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sudo apt-get install subversion cmake gcc g++ wx2.8-headers libwxgtk2.8-dev libglut3-dev libglui-dev zlib1g-dev libfreeimage-dev libfreetype6-dev libois-dev libzzip-dev libxaw7-dev libxrandr-dev x11proto-randr-dev nvidia-cg-toolkit libgtk2.0-dev libboost-dev
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Step 1 - build and install Bullet
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Get Bullet source (my custom-patched version):
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wget http://www.skyscrapersim.com/downloads/dev/other_apps/bullet-current.tar.bz2
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Extract Bullet:
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tar xfvj bullet-current.tar.bz2
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Build and install Bullet:
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cd bullet
cmake -DCMAKE_C_FLAGS=-fPIC -DCMAKE_CXX_FLAGS=-fPIC -DINSTALL_EXTRA_LIBS=ON -DBUILD_DEMOS=OFF -DUSE_DOUBLE_PRECISION
make
sudo make install
cd
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If you have a multi-core system, you can type "make -j2" for example to build using 2 cores, or "make -j4" for 4 cores.  If you want to play around with the Bullet demos, remove the "-DBUILD_DEMOS=OFF" portion when running cmake above and then build it.


Step 2 - install the FMOD sound system
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Get the related Linux package from:
http://www.fmod.org/index.php/download#FMODExProgrammersAPI

(this download URL will change - http://www.fmod.org/fmod-downloads.html)
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wget http://www.fmod.org/index.php/release/version/fmodapi44203linux.tar.gz
tar xfvz fmodapi44203linux.tar.gz
cd fmodapi44203linux/api
sudo mkdir /usr/local/include/fmodex
sudo cp -p inc/* /usr/local/include/fmodex/
sudo cp -p lib/* /usr/local/lib/
cd
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Step 3 - build and install OGRE
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First get the source:
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wget http://www.skyscrapersim.com/downloads/dev/other_apps/ogre_src_v1-7-4.tar.bz2
tar xfvj ogre_src_v1-7-4.tar.bz2
cd ogre_src_v1-7-4
cmake -DOGRE_BUILD_SAMPLES=OFF
make
sudo make install
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(if you want to install the OGRE samples, for the cmake line above do "cmake -DINSTALL_SAMPLES=ON" instead)


Step 4 - build and install Caelum (sky system)
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wget http://www.skyscrapersim.com/downloads/dev/other_apps/caelum-0.6.1.tar.gz
tar xfvz caelum-0.6.1.tar.gz
cd caelum-0.6.1
cmake .
make
sudo make install
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Step 5 - build Skyscraper (this also builds the built-in OgreBullet libraries)
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First grab the source via SVN, and build.
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svn co http://svn.tliquest.net/skyscraper/skyscraper/trunk skyscraper
cd skyscraper
wget http://www.skyscrapersim.com/downloads/dev/other_apps/plugins.cfg
cmake -DCMAKE_C_FLAGS="-fPIC -DBT_USE_DOUBLE_PRECISION" -DCMAKE_CXX_FLAGS="-fPIC -DBT_USE_DOUBLE_PRECISION"
make svnrev/svnrev
./svnrev.sh
make
ln -s Skyscraper skyscraper
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Finally, run Skyscraper:
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./skyscraper
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To update the app in the future, first do an SVN update, rebuild and run:
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svn update
./svnrev.sh
make
./skyscraper
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