cmake required

[aeosynth]

   Compiling rayon v0.8.2
error: failed to run custom build command for `servo-freetype-sys v4.0.3`
process didn't exit successfully: `/home/james/src/limn/target/debug/build/servo-freetype-sys-d8d8b311fef1a5ad/build-script-build` (exit code: 101)
--- stdout
running: "cmake" "/home/james/.cargo/registry/src/jackfan.us.kg-1ecc6299db9ec823/servo-freetype-sys-4.0.3/freetype2" "-DWITH_BZip2=OFF" "-DWITH_HarfBuzz=OFF" "-DWITH_PNG=OFF" "-DWITH_ZLIB=OFF" "-DCMAKE_INSTALL_PREFIX=/home/james/src/limn/target/debug/build/servo-freetype-sys-7d15b811bd9b7efb/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_BUILD_TYPE=Release"
--- stderr
thread 'main' panicked at '
failed to execute command: No such file or directory (os error 2)
is `cmake` not installed?
build script failed, must exit now', /home/james/.cargo/registry/src/jackfan.us.kg-1ecc6299db9ec823/cmake-0.1.26/src/lib.rs:599:4
note: Run with `RUST_BACKTRACE=1` for a backtrace.
warning: build failed, waiting for other jobs to finish...
error: build failed

once i installed cmake the image example built and ran fine