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+# Basics
+
+It is planned to use the `autotools` in a near future, but for now,
+OwlPS uses a simple set of GNU makefiles to compile and install the
+various modules. The top-level makefile will call `make` into the
+subdirectories for all the modules.
+
+At any level, you can type:
+
+    make help
+
+to see the usable targets and requirements to compile.
+
+Once you have all the requirements, the easy way is to just call `make`
+from the top-level directory, to build all the modules.
+
+
+# Compiling
+
+You can choose the compiler to use by setting the CC variable when
+calling `make`, for example:
+
+    make CC=tcc
+
+By default, `clang` will be used for C modules, or `colorgcc` if `clang`
+is not installed. If neither `clang` or `colorgcc` is installed, CC is
+left to the `make` default.
+
+For OwlPS Positioner (C++), `colorgcc` is used, or the default CC if it
+is not installed. Please keep in mind that this module requires GCC 4.4
+or later.
+
+
+# Compiling on BSD systems
+
+Remember to use `gmake` instead of `make`. From the top-level, you will
+need to set the MAKE variable, for example:
+
+    gmake MAKE=gmake
+
+OwlPS Listener will not compile since it still contains some
+Linux-specific code. You may want to comment-out the related lines of
+the top-level makefile.
+
+You might also need to set some variables, for example CC to force a
+specific GCC version to be used.
+
+
+# Compiling for OpenWrt
+
+To compile for OpenWrt, you need to set the OPENWRT_VERSION when calling
+make, for example:
+
+    make OPENWRT_VERSION=10.03
+
+It is assumed than the OpenWrt SDK is installed in
+`$HOME/openwrt/buildroot` and that the target architecture is `atheros`.
+For a different set up, you will need to edit the `common.mk` file.
+
+For now, only OpenWrt 10.03 and trunk are supported. If you set
+OPENWRT_VERSION to something different than "10.03", it is replaced by
+"trunk".
+
+For this to work we advise that you do something like that:
+
+    mkdir -p ~/openwrt/atheros/trunk
+    cd ~/openwrt/atheros/trunk
+    ln -s ../../buildroot/staging_dir
+    ln -s \
+      ../../buildroot/staging_dir/target-mips_uClibc-0.9.33 \
+      target-mips_uClibc
+    ln -s \
+      ../../buildroot/staging_dir/toolchain-mips_gcc-4.6-linaro_uClibc-0.9.33/ \
+      toolchain-mips_gcc_uClibc
+
+Of course, you will have to update the symlinks when you compile a new
+version of the SDK.
+
+
+# Installing
+
+At any level, you can install what is installable by typing, as `root`:
+
+    make install