[building] Update BUILDING.md instructions as discussed on GitHub

Fohlen · Fohlen · commit 1720ee1aa7f1 · 2018-12-21T12:20:41.000+01:00
diff --git a/BUILDING.md b/BUILDING.md
@@ -1,21 +1,32 @@
 Building
 --------
 
-You can choose to build this library either with `cmake` or `automake`.
+You can choose to build this library either with `autotools` or `cmake`.
 The pre-requisite for compilations are:
 
 - you should have cloned this repository with `git clone https://github.com/libsigcplusplus/libsigcplusplus.git`
-- you should have a modern version of `cmake` or `automake` depending on your preference
-- either GCC or Clang should be installed with a version that supports at least `C++17`
+- you should have a modern version of `autotools` (>= 2.59) or `cmake` (>= 3.0.2) depending on your preference
+
+## autotools
+
+When using the `autotools` option also make sure that you have [mm-common](https://github.com/GNOME/mm-common) installed.
+
+To build `libsigc++` with `autotools` proceed as follows:
+
+- `cd libsigcpluscplus`
+- `./autogen.sh`
+- `./configure`
+- `make`
+
+This will build the library including test cases. If you wish to use different options consider `./configure --help`
 
 ## CMake
 
 To build `libsigc++` with `CMake` proceed as follows:
 
+- `mkdir libsigcplusplus/build`
 - `cd libsigcplusplus/build`
 - `cmake ..`
 - `make`
 
-This will build the library including all it's test cases. If you wish to use different options consider `make help`
-
-## automake
+This will build the library including all its test cases. If you wish to use different options consider `make help`
