Pass INSTALL_PREFIX to cmake

This allows to install to a location other than /usr/local without
invoking cmake manually.

1 files changed, 4 insertions, 1 deletions

diff --git a/README.md b/README.md
index ca8246e..776d886 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,10 @@ the repository to reduce build dependencies.
 If you have GNU make, you can simply `make`, `make test`, and `make
 install`.  This calls [cmake] to create a `Makefile` in the `build`
 directory, then uses that `Makefile` to create the executable and
-library.  The binaries can be found in `build/src`.
+library.  The binaries can be found in `build/src`.  The default
+installation prefix is `/usr/local`.  To change the installation
+prefix, pass the `INSTALL_PREFIX` variable if you run `make` for the
+first time: `make INSTALL_PREFIX=path`.
 
 For a more portable method, you can use [cmake] manually. [cmake] knows
 how to create build environments for many build systems.  For example,