update readmes

2 files changed, 60 insertions, 8 deletions

diff --git a/readme.md b/readme.md
index 5351dfe..24bb66f 100644
--- a/readme.md
+++ b/readme.md
@@ -8,18 +8,45 @@ This repository contains:
 |`mwe/`|minimal working examples and proof-of-concepts|
 |`src/crepe/`|game engine source code|
 |`src/test/`|unit tests|
-|`src/example`|standalone examples using game engine|
+|`src/example/`|standalone examples using game engine|
 
 ## Compilation
 
 This repository uses CMake (the makefile in the root of this repository is for
-running auxiliary tasks only). Make sure you have initialized and updated the
-submodules before compiling.
+running auxiliary tasks only). See [src/readme.md](src/readme.md) for detailed
+building instructions.
+
+## Installing libraries
+
+The expected library (source) versions are included in this repository as git
+submodules. Follow these steps for manually building one of the required
+libraries from source:
+
+1. Ensure the git submodules are initialized:
+   ```
+   $ git submodule update --init --recursive --depth 1
+   ```
+2. `cd` into the library source folder:
+   ```
+   $ cd lib/googletest
+   or
+   $ cd lib/sdl2
+   or
+   $ cd lib/soloud/contrib
+   ```
+3. Configure the build, run the build and install:
+   ```
+   $ cmake -B build -G Ninja
+   $ ninja -C build
+   # ninja -C build install
+   ```
 
 ## Documentation
 
-API documentation is done using Doxygen. To generate the docs, run `make
-doxygen`.
+API documentation is done using Doxygen. To generate the docs, run
+```
+$ make doxygen
+```
 
 ## Code style
 
diff --git a/src/readme.md b/src/readme.md
index 1c5d3a2..a4a71e7 100644
--- a/src/readme.md
+++ b/src/readme.md
@@ -2,7 +2,32 @@
 
 This folder contains the crêpe engine source files, unit tests, and some toy
 examples. The only target built by default by the CMakeLists.txt in this folder
-is the crêpe shared library object. Unit tests can be built by explicitly
-specifying the target `test_main` when running the build command. Each source
-file in the example/ folder corresponds to a CMake target as well.
+is the crêpe shared library object.
+
+Examples (using Ninja):
+
+```
+$ cmake -B build -G Ninja
+$ ninja -C build
+```
+
+Unit tests can be built by explicitly specifying the target `test_main` when
+running the build command:
+
+```
+$ ninja -C build test_main
+```
+
+Each source file in the example/ folder corresponds to a CMake target as well:
+
+```
+$ ninja -C build audio_internal components_internal
+```
+
+For installing crêpe system-wide after building (install must be run with
+elevated privileges):
+
+```
+# ninja -C build install
+```