added explanations and links

1 files changed, 65 insertions, 12 deletions

diff --git a/README.md b/README.md
index deb860c7..e4034936 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 libdcp
 ======
 
-Hello.
+Library for reading and writing Digital Cinema Packages (DCPs).
 
 
 Acknowledgements
@@ -17,20 +17,73 @@ Bugfixes were received from Philip Tschiemer.
 Building
 ========
 
-    ./waf configure
-    ./waf
-    sudo ./waf install
+```
+  ./waf configure
+  ./waf
+  sudo ./waf install
+```
 
 
 Dependencies
-============
-
-boost filesystem, signals2 and unit testing libraries
-openssl
-libsigc++
-libxml++
-xmlsec
-openjpeg (1.5.0 or above)
+--------
+
+- pkg-config (for build system)
+- boost (1.45 or above): filesystem, signals2, datetime and unit testing libraries
+- openssl
+- libsigc++
+- libxml++
+- xmlsec
+- ImageMagick or GraphicsMagick
+- sndfile
+- openjpeg (1.5.0 or above)
+- [libasdcp-cth](https://github.com/cth103/asdcplib-cth/tree/cth)
+- [libcxml](https://github.com/cth103/libcxml)
+- (optional) OpenMP
+- (optional) gcov (for tests)
+
+
+Build options
+---------
+```
+  --target-windows      set up to do a cross-compile to Windows
+  --enable-debug        build with debugging information and without optimisation
+  --static              build libdcp statically, and link statically to openjpeg, cxml, asdcplib-cth
+  --disable-tests       disable building of tests
+  --disable-gcov        dont use gcov in tests
+  --disable-examples    disable building of examples
+  --enable-openmp       enable use of OpenMP
+  --openmp=OPENMP       Specify OpenMP Library to use: omp, gomp (default), iomp..
+  --jpeg=JPEG           specify JPEG library to build with: oj1 or oj2 for OpenJPEG 1.5.x or OpenJPEG 2.1.x respectively
+  --force-cpp11         force use of C++11
+```
+
+A note on building for macOS
+--------
+As goto solution, all dependencies can be installed using [Homebrew](https://brew.sh/).
+Make sure to add the respective `PKG_CONFIG_PATH` paths so the packages are indeed found.
+
+```bash
+## Default Homebrew paths
+PKG_CONFIG_PATH="/usr/local/opt/icu4c/lib/pkgconfig"
+PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/opt/pangomm/lib/pkgconfig"
+PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/opt/libffi/lib/pkgconfig" # needed by gobject2
+PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/opt/openssl/lib/pkgconfig"
+PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/opt/libxml2/lib/pkgconfig"
+
+## Set as installed
+# PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/path-to-your-install-folder/libasdcp-cth"
+# PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/path-to-your-install-folder/libcxml"
+
+export PKG_CONFIG_PATH
+```
+
+If you want support for *OpenMP*, the standard llvm compiler coming with Xcode (or rather its command line tools) does not support it such that you will have to override the compiler (using the `CXX` environment variable).
+The version provided through Homebrew will work (or any of your choice) along with `--openmp=omp`.
+
+```bash
+## Default Homebrew path
+export CXX=/usr/local/opt/llvm/bin/clang++
+```
 
 
 Documentation