diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..fb0e4de
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,29 @@
+# GitHub actions workflow.
+# https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions
+
+name: Build CI
+
+on:
+  push:
+    branches: [master]
+    tags: [v*]
+  pull_request:
+    types: [opened]
+    branches: [master]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        cc: [gcc]
+    runs-on: ${{ matrix.os }}
+    env:
+      CC: ${{ matrix.cc }}
+    steps:
+    - run: sudo apt-get update -y
+    - run: sudo apt-get install -y libgtkmm-3.0-dev libcurl4-gnutls-dev libyajl-dev valgrind
+    - uses: actions/checkout@v2
+    - run: make
+    - run: make clean
+    - run: make dev
diff --git a/.gitignore b/.gitignore
index 01b989e..ffc75f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,12 +2,13 @@ vgcore.*
 massif.*
 /bin/SamRewritten
 /bin/samrewritten
+build/
 /glade/*.glade~
 /glade/*.glade#
-obj/*
-package/AppDir/*
-package/pkg/*
-package/src/*
-package/SamRewritten/*
+package/AppDir/
+package/pkg/
+package/src/
+package/SamRewritten/
 package/SamRewritten*.AppImage
-package/samrewritten*.tar.*
\ No newline at end of file
+package/samrewritten*.tar.*
+obj/
diff --git a/Makefile b/Makefile
index b7c176d..e400fea 100644
--- a/Makefile
+++ b/Makefile
@@ -1,29 +1,49 @@
-CXX=g++ -std=c++17
-RM=rm -f
-RMDIR=rm -rf
+CXXFLAGS+=-std=c++17
+OBJDIR=obj
+LIBDIR?=lib
+PREFIX=/usr
 HFILES:=$(shell find src/ -type f -iname *.h -print)
 CXXFILES:=$(shell find src/ -type f -iname *.cpp -print)
-GTKFLAGS=$(shell pkg-config gtkmm-3.0 --cflags --libs)
-CXXFLAGS=$(GTKFLAGS) -Wall -lsteam_api -lcurl -lyajl -ldl
-LDFLAGS=-L${CURDIR}/bin
-OBJDIR=obj
+PKG_CONFIG?=pkg-config
+GTKFLAGS:=$(shell $(PKG_CONFIG) gtkmm-3.0 --cflags)
+GTKLIBS:=$(shell $(PKG_CONFIG) gtkmm-3.0 --libs)
+# For now, leave it to the distro to provide preferred extra flags
+CXXFLAGS+=$(GTKFLAGS) -Wall
+LDLIBS+=$(GTKLIBS) -lsteam_api -lcurl -lyajl -ldl
+LDFLAGS+=-L${CURDIR}/bin
 OBJS=$(addprefix ${OBJDIR}/,$(subst .cpp,.o,${CXXFILES}))
 
-all: CXXFLAGS += -O3
 all: ${CURDIR}/bin/samrewritten
-	@echo -e "==== Use '\033[1mmake dev\033[0m' to keep debug symbols"
-	@echo -e "==== Use '\033[1mmake clean\033[0m' to remove object files"
-	@echo -e "==== Nothing left to do."
+	@printf "==== %b\n" \
+		"Use '\033[1mmake dev\033[0m' to keep debug symbols" \
+		"Use '\033[1mmake clean\033[0m' to remove object files" \
+		"Nothing left to do."
 
 dev: CXXFLAGS += -g -DDEBUG_CERR
 dev: ${CURDIR}/bin/samrewritten
 
+.PHONY: clean
 clean:
-	${RMDIR} ${OBJDIR}
+	rm -rf ${OBJDIR}
+
+.PHONY: install
+install: bin/launch.sh bin/samrewritten bin/libsteam_api.so
+	# TODO: use install for all of these?
+	mkdir -p ${DESTDIR}${PREFIX}/${LIBDIR}/SamRewritten/{bin,glade,assets}
+	mkdir -p ${DESTDIR}${PREFIX}/share/icons/hicolor/{64x64,256x256}/apps
+	mkdir -p ${DESTDIR}${PREFIX}/share/applications
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp $^ ${DESTDIR}${PREFIX}/${LIBDIR}/SamRewritten/bin/
+	ln -s ${DESTDIR}${PREFIX}/${LIBDIR}/SamRewritten/bin/launch.sh ${DESTDIR}${PREFIX}/bin/samrewritten
+	cp glade/main_window.glade ${DESTDIR}${PREFIX}/${LIBDIR}/SamRewritten/glade/main_window.glade
+	cp assets/icon_64.png ${DESTDIR}${PREFIX}/share/icons/hicolor/64x64/apps/samrewritten.png
+	cp assets/icon_256.png ${DESTDIR}${PREFIX}/share/icons/hicolor/256x256/apps/samrewritten.png
+	cp assets/icon_256.png ${DESTDIR}${PREFIX}/${LIBDIR}/SamRewritten/assets/
+	cp package/samrewritten.desktop ${DESTDIR}${PREFIX}/share/applications/
 
 ${CURDIR}/bin/samrewritten: $(OBJS)
-	${CXX} -o ${CURDIR}/bin/samrewritten $(OBJS) ${LDFLAGS} ${CXXFLAGS}
+	${CXX} -o ${CURDIR}/bin/samrewritten $(OBJS) ${LDFLAGS} ${CXXFLAGS} ${LDLIBS}
 
 ${OBJDIR}/%.o: %.cpp $(HFILES)
-	@mkdir -p $$(dirname $@)
-	$(CXX) -c -o $@ $< ${LDFLAGS} $(CXXFLAGS)
+	@mkdir -p $(@D)
+	$(CXX) -c -o $@ $< ${CXXFLAGS}
diff --git a/README.MD b/README.md
similarity index 95%
rename from README.MD
rename to README.md
index 70680c1..2ea294d 100644
--- a/README.MD
+++ b/README.md
@@ -22,6 +22,8 @@ It comes with third-party tools integration and a nice user interface.
 
 SamRewritten is constantly under development, if you think you can give us a hand, feel free to reach us :)
 
+### ⚠️ As of now, SamRewritten only works if Steam has been installed through your package manager (apt, pacman, ...)
+
 # Building
 
 To build this project, clone this repository on your PC, and run the `make` command within the repository folder that you downloaded.
@@ -43,12 +45,18 @@ If you're encountering issues building SamRewritten, make sure you have installe
 
 To run SamRewritten, simply launch `$ ./bin/launch.sh`
 
-# AUR Installation
+## AUR Installation
 
 You can install SamRewritten from the AUR by installing the `samrewritten-git` package.
 
 Run SamRewritten by opening the corresponding desktop entry, or by using the `samrewritten` command.
 
+## Gentoo Installation
+
+SamRewritten is available as `games-util/samrewritten` through the following overlay:
+
+https://github.com/telans/EBUILDS
+
 # Features
 
 SamRewritten's features match and exceed the original SAM:
@@ -140,4 +148,4 @@ SamRewritten uses JSON to communicate between the interface and the "backend log
 
 ## Footnotes
 
-This software is licensed under the GNU GPL v3 and comes with no warranty. Use it at your own risk. We believe you should not get any ban using it, but we do not take any responsability over your user experience
+This software is licensed under the GNU GPL v3 and comes with no warranty. Use it at your own risk. We believe you should not get any ban using it, but we do not take any responsibility over your user experience.
diff --git a/bin/launch.sh b/bin/launch.sh
index a8c1da4..3c10863 100755
--- a/bin/launch.sh
+++ b/bin/launch.sh
@@ -1,10 +1,10 @@
 #!/bin/bash
 
-SCRIPT_PATH=`dirname $(realpath $0)`
+SCRIPT_PATH=$(dirname "$(realpath "$0")")
 export LD_LIBRARY_PATH=${SCRIPT_PATH}
 
 # Workaround waiting for a fix https://github.com/lloyd/yajl/issues/222
 export LC_NUMERIC=en_US.UTF-8
 
-cd ${SCRIPT_PATH}/..
-${SCRIPT_PATH}/samrewritten $@
+cd "${SCRIPT_PATH}"/..
+"${SCRIPT_PATH}"/samrewritten "$@"
diff --git a/bin/valgrind.sh b/bin/valgrind.sh
index 76b3a22..fbf5a38 100755
--- a/bin/valgrind.sh
+++ b/bin/valgrind.sh
@@ -1,12 +1,12 @@
 #!/bin/bash
 
-SCRIPT_PATH=`dirname $(realpath $0)`
+SCRIPT_PATH=$(dirname "$(realpath "$0")")
 export LD_LIBRARY_PATH=${SCRIPT_PATH}
 
 # Workaround waiting for a fix https://github.com/lloyd/yajl/issues/222
 export LC_NUMERIC=en_US.UTF-8
 
-cd ${SCRIPT_PATH}/..
+cd "${SCRIPT_PATH}"/..
 rm -f /tmp/sam-massif.out
 valgrind --tool=massif --massif-out-file=/tmp/sam-massif.out ${SCRIPT_PATH}/samrewritten $@
-massif-visualizer /tmp/sam-massif.out
\ No newline at end of file
+massif-visualizer /tmp/sam-massif.out
diff --git a/package/PKGBUILD b/package/PKGBUILD
index 080de8e..fd2d06d 100644
--- a/package/PKGBUILD
+++ b/package/PKGBUILD
@@ -3,7 +3,7 @@
 
 pkgname="samrewritten-git"
 _pkgname="SamRewritten"
-pkgver=r133.a839930
+pkgver=r199.916d83d
 pkgrel=1
 pkgdesc="A Steam Achievement Manager For Linux."
 arch=("any")
@@ -24,18 +24,10 @@ pkgver() {
 
 build() {
     cd ${_pkgname}
-    make
+		make
 }
 
 package() {
-    install -dm755 "${pkgdir}/usr/lib/"
-    # Only copy required files. (Except for Glade files, as more may be added in the future.)
-    cp -r --parents ${_pkgname}/{LICENSE,README.MD,bin/{launch.sh,libsteam_api.so,samrewritten},glade/*.glade,assets/icon_256.png} ${pkgdir}/usr/lib/
-    install -Dm644 ${_pkgname}/assets/icon_256.png ${pkgdir}/usr/share/icons/hicolor/256x256/apps/samrewritten.png
-    install -Dm644 ${_pkgname}/assets/icon_64.png ${pkgdir}/usr/share/icons/hicolor/64x64/apps/samrewritten.png
-    # Executable
-    install -dm755 ${pkgdir}/usr/bin
-    ln -s /usr/lib/${_pkgname}/bin/launch.sh ${pkgdir}/usr/bin/samrewritten
-    # Desktop Entry
-    install -Dm644 ${_pkgname}/package/samrewritten.desktop ${pkgdir}/usr/share/applications/samrewritten.desktop
-}
\ No newline at end of file
+    cd ${_pkgname}
+    make DESTDIR=${pkgdir} install
+}
diff --git a/src/controller/MySteam.cpp b/src/controller/MySteam.cpp
index 66f38e3..e0fd59b 100644
--- a/src/controller/MySteam.cpp
+++ b/src/controller/MySteam.cpp
@@ -335,6 +335,7 @@ MySteam::setup_timed_modifications(uint64_t seconds, MODIFICATION_SPACING spacin
     // fetching achievements in CLI mode.
 
     std::vector<uint64_t> times;
+    std::vector<uint64_t> rel_times;
     size_t size = m_pending_ach_modifications.size();
 
     if (size == 0) {
@@ -364,19 +365,20 @@ MySteam::setup_timed_modifications(uint64_t seconds, MODIFICATION_SPACING spacin
 
     for (size_t i = 0; i < size; i++) {
         std::cout << "Modify achievement " << m_achievement_changes[i].id << " in " << times[i] << " seconds"
-                  << " (or " << (((double)times[i]) / 60) << " minutes or " << (((double)times[i]) / 60) << " hours)" << std::endl;
+                  << " (or " << (((double)times[i]) / 60) << " minutes or " << ((((double)times[i]) / 60) / 60) << " hours)" << std::endl;
     }
 
     // Put times in order since we'll use the differences from one to the next
     std::sort(times.begin(), times.end());
 
     // Make relative times
+    rel_times.push_back(times[0]);
     for (size_t i = 1; i < size; i++)
     {
-        times[i] = times[i] - times[i - 1];
+        rel_times.push_back(times[i] - times[i - 1]);
     }
 
-    return times;   
+    return rel_times;   
 }
 // => commit_timed_modifications
 
@@ -438,4 +440,5 @@ MySteam::set_special_flags() {
     {
         m_achievements[next_most_achieved_index].special |= ACHIEVEMENT_NEXT_MOST_ACHIEVED;
     }
-}
\ No newline at end of file
+}
+
diff --git a/src/gui/MainPickerWindow.cpp b/src/gui/MainPickerWindow.cpp
index ceada2e..d8809f9 100644
--- a/src/gui/MainPickerWindow.cpp
+++ b/src/gui/MainPickerWindow.cpp
@@ -212,6 +212,8 @@ void
 MainPickerWindow::on_refresh_achievements_button_clicked() {
     g_steam->clear_changes();
     m_async_loader.populate_achievements();
+    m_display_only_locked_button->set_active(false);
+    m_display_only_unlocked_button->set_active(false);
 }
 // => on_refresh_achievements_button_clicked
 
@@ -233,6 +235,8 @@ void
 MainPickerWindow::on_store_button_clicked() {
     g_steam->commit_changes();
     m_async_loader.populate_achievements();
+    m_display_only_locked_button->set_active(false);
+    m_display_only_unlocked_button->set_active(false);
 }
 // => on_store_button_clicked
 
@@ -297,6 +301,8 @@ MainPickerWindow::on_cancel_timed_modifications_button_clicked() {
     m_submit_timed_modifications_button->show();
     m_applying_modifications_label->hide();
     m_timed_modifications_window->hide();
+    m_display_only_locked_button->set_active(false);
+    m_display_only_unlocked_button->set_active(false);
 }
 // => on_close_timed_modifications_window
 
@@ -335,7 +341,7 @@ MainPickerWindow::on_submit_timed_modifications_button_clicked() {
     } else if (active_time_id == "days_id") {
         time *= 60 * 60 * 24;
     } else {
-        std::cerr << "unkown time unit!" << std::endl;
+        std::cerr << "unknown time unit!" << std::endl;
     }
 
     if (m_even_spacing_button->get_active()) {
@@ -343,7 +349,7 @@ MainPickerWindow::on_submit_timed_modifications_button_clicked() {
     } else if (m_random_spacing_button->get_active()) {
         spacing = RANDOM_SPACING;
     } else {
-        std::cerr << "unkown spacing!" << std::endl;
+        std::cerr << "unknown spacing!" << std::endl;
     }
 
     if (m_order_of_selection_button->get_active()) {
@@ -351,7 +357,7 @@ MainPickerWindow::on_submit_timed_modifications_button_clicked() {
     } else if (m_order_random_button->get_active()) {
         order = RANDOM_ORDER;
     } else {
-        std::cerr << "unkown order!" << std::endl;
+        std::cerr << "unknown order!" << std::endl;
     }
 
     m_timed_modification_times = g_steam->setup_timed_modifications(time, spacing, order);