- - [GNU Libtool](http://www.gnu.org/software/autoconf/) >= 2.2
- - Perl (optional: needed for `make check` and tests)
+ - **[GNU Libtool](https://www.gnu.org/software/libtool/) >= 2.2**
+ - **[pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/)**
+
+
+### Optional dependencies
+
+Optional packages to build LTTng-ust man pages:
+
+ - **[AsciiDoc](http://www.methods.co.nz/asciidoc/) >= 8.4.5**
+ (previous versions may work, but were not tested)
+ - **[xmlto](https://fedorahosted.org/xmlto/) >= 0.0.21** (previous
+ versions may work, but were not tested)
+
+Note that the man pages are already built in a distribution tarball.
+In this case, you only need AsciiDoc and xmlto if you indend to modify
+the AsciiDoc man page sources.
+
+Needed for `make check` and tests:
+
+ - **[Perl](https://www.perl.org/)**
+
+
+### Building steps