readme: update with gettext dependency

gettext is optional for compiling translations

Issue: #78928
Change-Id: Ie8d3200ab88afa4526fa9ab337658c360f3b35e0

README

@@ -24,12 +24,13 @@ Requirements
 - gnome-icon-theme-symbolic (certain icons are used which other themes might be missing)
 - libebook1.2 / evolution-data-server (3.10 or higher)
 - libnotify (optional, if you wish to receive desktop notifications of incoming calls, etc)
+- gettext (optional to compile translations)
 
 On Debian/Ubuntu these can be installed by:
-    sudo apt-get install g++ cmake libgtk-3-dev qtbase5-dev libclutter-gtk-1.0-dev gnome-icon-theme-symbolic libebook1.2-dev libnotify-dev
+    sudo apt-get install g++ cmake libgtk-3-dev qtbase5-dev libclutter-gtk-1.0-dev gnome-icon-theme-symbolic libebook1.2-dev libnotify-dev gettext
 
 On Fedora:
-    yum install gcc-c++ cmake gtk3-devel qt5-qtbase-devel clutter-gtk-devel gnome-icon-theme-symbolic evolution-data-server-devel libnotify-devel
+    yum install gcc-c++ cmake gtk3-devel qt5-qtbase-devel clutter-gtk-devel gnome-icon-theme-symbolic evolution-data-server-devel libnotify-devel gettext
 
 The build instruction for the daemon and libRingClient can be found on their respective wiki pages:
 - https://projects.savoirfairelinux.com/projects/ring-daemon/wiki
@@ -73,9 +74,9 @@ libRingClient on your system (eg: in /usr or /usr/local):
    -DCMAKE_INSTALL_PREFIX=/home/user/ringinstall
 4. now compile libRingClient and do 'make install', everything will be installed
    in the dir specified by the prefix
-4. now we just have to give the same install prefix to the cmake options of the
-   client and it will find libRingClient:
-   -DCMAKE_INSTALL_PREFIX=/home/user/ringinstall
+4. now we just have to point the client to the libRingClient cmake module during
+   the configuration:
+   -DLibRingClient_DIR=/home/user/ringinstall/lib/cmake/LibRingClient
 
 
 Debugging