Add building instructions for Gentoo

INSTALL.md

@@ -11,6 +11,7 @@ but compiling on Windows and macOS should be possible with the right tools.
     - [Alpine Linux 3.9+ / apk](#alpine-linux-39--apk)
     - [Arch Linux / pacman & AUR](#arch-linux--pacman--aur)
     - [Fedora 30+ / dnf](#fedora-30--dnf)
+    - [Gentoo / emerge](#gentoo--emerge)
     - [Ubuntu 19.04 / apt](#ubuntu-1904--apt)
     - [Ubuntu 19.10+, Debian bullseye / apt](#ubuntu-1910-debian-bullseye--apt)
     - [Void Linux / xbps](#void-linux--xbps)
@@ -50,8 +51,22 @@ properties and double-click to launch.
 
 ## Manual Installation
 
-Qt 5.12+, Python 3.6+ (with development headers and pip),
-PyOtherSide 1.5+ and libolm 3+ are required.
+**Qt 5.12+**, **Python 3.6+** (with **pip** to install packages from the
+[requirements.txt](requirements.txt)), **PyOtherSide 1.5+** and
+**libolm 3+** are required.  
+The equivalent `-dev` or `-devel` packages are needed, if your distro
+splits development headers into their own packages.
+
+For the Pillow Python package, these dependencies are recommended to support 
+all common image formats:
+
+- **libjpeg-turbo**
+- **zlib**
+- **libtiff**
+- **libwebp**
+- **openjpeg2**
+
+**libmediainfo** is also required for the pymediainfo package.
 
 ### Environment Variables
 
@@ -77,6 +92,7 @@ sudo apk add qt5-qtquickcontrols2-dev qt5-qtsvg-dev qt5-qtimageformats \
              build-base git cmake \
              libjpeg-turbo-dev zlib-dev tiff-dev libwebp-dev openjpeg-dev \
              libmediainfo-dev
+
 export PATH="/usr/lib/qt5/bin:$PATH"
 ```
 
@@ -110,9 +126,25 @@ sudo dnf install qt5-devel qt5-qtbase qt5-qtdeclarative qt5-qtquickcontrols2 \
                  git cmake \
                  libjpeg-turbo-devel zlib-devel libtiff-devel libwebp-devel	\
                  openjpeg2-devel libmediainfo-devel
+
 sudo ln -s /usr/bin/qmake-qt5 /usr/bin/qmake
 ```
 
+#### Gentoo / emerge
+
+[libolm](#installing-libolm-manually) must be manually installed.
+
+You might need to prepend the `emerge` command with `USE=bindist`,
+if `emerge` says so.
+
+```sh
+sudo emerge -av qtcore qtdeclarative qtquickcontrols2 \
+                qtsvg qtgraphicaleffects qtimageformats \
+                dev-python/pip pyotherside \
+                dev-vcs/git cmake \
+                libjpeg-turbo zlib tiff libwebp openjpeg libmediainfo
+```
+
 #### Ubuntu 19.04 / apt
 
 [libolm](#installing-libolm-manually) must be manually installed.

TODO.md

@@ -2,12 +2,17 @@
 
 ## Before release
 
-- Add Gentoo instructions
-- Build final AppImage and test media opening
+- Build final AppImage 
+
+## Main goals for next version
+
+- Redacting messages
+- Download progress bar for file events, "Save as..."
+- Make rooms fully manageable within Mirage: settings, permissions, kick, etc
 
 ## Refactoring
 
-- Rewrite the message selection buggy mess 
+- Rewrite the message text selection buggy mess 
 
 - Put keybindings in the components they belong to instead of shoving them
   all in one central file
@@ -22,7 +27,8 @@
 
 - Make sure we don't store any state in delegates
 
-- Drop the `buttonModel`/`buttonCallbacks` `HBox` approach, be more declarative
+- Drop the `HBox` `buttonModel`/`buttonCallbacks` `HBox` approach,
+  be more declarative
 
 ## Issues
 
@@ -30,8 +36,6 @@
 
 - Popups and room settings can't be scrolled when not enough height to show all
 
-- `Timer` and `Animation` are bound to framerate
-
 - Handle cases where a known account's access token is invalid
 - If an account is gone from the user's config, discard UI state last page
 
@@ -43,6 +47,7 @@
 - `code` and links in quote ("> http://example.com") aren't properly colored
   in room "last message" subtitle
 
+- `Timer` and `Animation` are bound to framerate
 - Terrible performance using `QT_QPA_PLATFORM=wayland-egl`, must use `xcb`
 - Can't use `QQmlApplicationEngine`, problem with QApplication?
   See https://bugreports.qt.io/browse/QTBUG-50992