added minimal requirements

README.md

@@ -2,36 +2,59 @@
 
 TREX library fo efficient I/O.
 
-## Current installation procedure from the tarball (`trexio-<version>.tar.gz`):
 
-1. `gzip -cd trexio-<version>.tar.gz | tar xvf -`
-2. `cd trexio-<version>` 
-3. `./configure`
-4. `make && sudo make install`
-5. `make check`
+## Minimal requirements (for users):
 
-## Current (temporary) installation procedure from the GitHub repo clone:
+- Autoconf
+- C compiler		(gcc/icc/clang)
+- Fortran compiler 	(gfortran/ifort/flang)
+
+
+## Installation procedure from the tarball (for users):
+
+1. Download the `trexio-<version>.tar.gz` file
+2. `gzip -cd trexio-<version>.tar.gz | tar xvf -`
+3. `cd trexio-<version>` 
+4. `./configure`
+5. `make && sudo make install`
+6. `make check`
+
+
+**Note: on systems with no `sudo` rights access, one can replace `./configure` with `./configure prefix=${PWD}` in order to execite `make install/uninstall` commands without `sudo`. This will enable the installation in the root directory of the library.**
+
+
+## Additional requirements (for developers):
+
+- Automake
+- python3 	(>=3.6)
+- emacs		(>=26.0)
+
+
+## Installation procedure from the GitHub repo clone (for developers):
 
 1. `git clone https://github.com/TREX-CoE/trexio.git`
 2. `cd trexio` 
-4. `cd tools && ./build_trexio.sh && cd ..`
-5. `autoreconf`
-6. `automake --add-missing --copy`
-7. `./configure`
-8. `make && sudo make install`
-9. `make check`
+3. `cd tools && ./build_trexio.sh && cd ..`
+4. `autoreconf`
+5. `automake --add-missing --copy`
+6. `./configure`
+7. `make && sudo make install`
+8. `make check`
 
-**Note: on systems with no `sudo` access, one can replace `./configure` with `./configure prefix=${PWD}` in order to execite `make install/uninstall` commands with `sudo` rights. This will enable the installation in the root directory of the library.**
 
 ## Tutorial
 
 **TODO**
 
+
 ## Technical documentation
 
-[Generated from TREXIO org-mode files](https://trex-coe.github.io/trexio/)
+[Documentation generated from TREXIO org-mode files](https://trex-coe.github.io/trexio/)
+
 
 ### Miscellaneous
 
 Note: The code should be compliant with the C99 [CERT C coding
 standard](https://resources.sei.cmu.edu/downloads/secure-coding/assets/sei-cert-c-coding-standard-2016-v01.pdf). This can be checked with the `cppcheck` tool.
+
+