Improve pip instructions
Our build scripts invoke `python3` in preference to `python`, so make the
default instruction use `python3`. On many systems (macOS, some Linux),
`python` invokes Python 2 which our scripts do not support.
Suggest --user by default. It's usually the right thing outside of venvs.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/README.md b/README.md
index f4bf4e1..288e692 100644
--- a/README.md
+++ b/README.md
@@ -61,10 +61,11 @@
The following tools are required:
* Perl, for some library source files and for Visual Studio build files.
-* Python 3 and some Python packages, for some library source files, sample programs and test data. To install the necessary packages, run
+* Python 3 and some Python packages, for some library source files, sample programs and test data. To install the necessary packages, run:
```
- python -m pip install -r scripts/basic.requirements.txt
+ python3 -m pip install --user -r scripts/basic.requirements.txt
```
+ Depending on your Python installation, you may need to invoke `python` instead of `python3`. To install the packages system-wide, omit the `--user` option.
* A C compiler for the host platform, for some test data.
If you are cross-compiling, you must set the `CC` environment variable to a C compiler for the host platform when generating the configuration-independent files.