diff --git a/README b/README
index c43cf3e..627acf1 100644
--- a/README
+++ b/README
@@ -2,10 +2,23 @@ FITS/XISF image viewer with multithreaded image loading
 
 To get all dependencies install these packages
 
-    sudo apt install qtbase5-dev libraw-dev libexif-dev libcfitsio-dev libgsl-dev cmake
+    sudo apt install qtbase5-dev libraw-dev libexif-dev libcfitsio-dev libgsl-dev wcslib-dev libopencv-dev cmake
+
+on OpenSUSE
+
+    sudo zypper install opencv-devel gsl-devel exif-devel libraw-devel wcslib-devel libqt5-qtbase-devel
+
+MacOS X
+
+To compile on MacOS install XCode first. Then install homebrew in x86_64 mode
+with "arch -i x86_64". Building on native ARM is not supported.
+
+    homebrew install qt5 libraw cfitsio libexif libgsl wcslib opencv
+
+You may need to set CMAKE_PREFIX_PATH for Qt5 and OpenCV so CMake can find them.
 
 Then to build run standard cmake
 
     cmake -B build -S .
-    make
-    ./tenmon
+    cmake --build build
+    ./build/tenmon