diff --git a/scripts/linux.d/gentoo b/scripts/linux.d/gentoo
new file mode 100644
index 0000000000..017c9c6254
--- /dev/null
+++ b/scripts/linux.d/gentoo
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+if ! command -v qlist > /dev/null 2>&1; then
+    echo "app-portage/portage-utils is required but not installed. Installing..."
+    sudo emerge --ask --verbose app-portage/portage-utils
+fi
+
+REQUIRED_DEV_PACKAGES=(
+    app-crypt/libsecret
+    dev-build/autoconf
+    dev-build/cmake
+    dev-build/libtool
+    dev-build/ninja
+    dev-cpp/gstreamermm
+    dev-libs/libmspack
+    dev-libs/libspnav
+    dev-libs/openssl
+    dev-vcs/git
+    gui-libs/eglexternalplatform
+    kde-frameworks/extra-cmake-modules
+    media-libs/glew
+    media-libs/gst-plugins-base:1.0
+    media-libs/gstreamer:1.0
+    net-misc/curl
+    net-misc/wget
+    sys-apps/dbus
+    sys-apps/file
+    sys-apps/texinfo
+    sys-devel/gcc
+    sys-devel/gettext
+    sys-devel/m4
+    virtual/libudev
+    x11-libs/gtk+:3
+)
+
+if [[ -n "$UPDATE_LIB" ]]
+then
+    echo -e "Updating Gentoo ...\n"
+
+    # Check which version of webkit-gtk is available/preferred
+    if qlist -I net-libs/webkit-gtk:4 > /dev/null 2>&1; then
+        REQUIRED_DEV_PACKAGES+=(net-libs/webkit-gtk:4)
+    elif qlist -I net-libs/webkit-gtk:4.1 > /dev/null 2>&1; then
+        REQUIRED_DEV_PACKAGES+=(net-libs/webkit-gtk:4.1)
+    else
+        # Default to 4.1 if neither is installed
+        REQUIRED_DEV_PACKAGES+=(net-libs/webkit-gtk:4.1)
+    fi
+
+    if [[ -n "$BUILD_DEBUG" ]]
+    then
+        REQUIRED_DEV_PACKAGES+=(dev-libs/openssl net-misc/curl)
+    fi
+
+    # Filter out packages that are already installed
+    packages_to_install=()
+    for pkg in "${REQUIRED_DEV_PACKAGES[@]}"; do
+        if ! qlist -I "$pkg" > /dev/null 2>&1; then
+            packages_to_install+=("$pkg")
+        fi
+    done
+
+    # Install them if there are any to install
+    if [ ${#packages_to_install[@]} -gt 0 ]; then
+        sudo emerge --ask --verbose --noreplace "${packages_to_install[@]}"
+    else
+        echo "All required packages are already installed."
+    fi
+
+    echo -e "done\n"
+    exit 0
+fi
+
+export FOUND_GTK3_DEV
+FOUND_GTK3_DEV=$(qlist -I x11-libs/gtk+:3 2>/dev/null || find /usr/lib64/libgtk-3.so 2>/dev/null || true)
diff --git a/src/libslic3r/GCode/CoolingBuffer.cpp b/src/libslic3r/GCode/CoolingBuffer.cpp
index 53c17422f3..41e612fdab 100644
--- a/src/libslic3r/GCode/CoolingBuffer.cpp
+++ b/src/libslic3r/GCode/CoolingBuffer.cpp
@@ -879,8 +879,8 @@ std::string CoolingBuffer::apply_layer_cooldown(
                 fan_speed_change_requests[CoolingLine::TYPE_IRONING_FAN_START] = true;
                 need_set_fan = true;
             }
-        } else if (line->type & CoolingLine::TYPE_IRONING_FAN_END && fan_speed_change_requests[CoolingLine::TYPE_IRONING_FAN_START]) {
-            if (ironing_fan_control) {
+        } else if (line->type & CoolingLine::TYPE_IRONING_FAN_END) {
+            if (ironing_fan_control && fan_speed_change_requests[CoolingLine::TYPE_IRONING_FAN_START]) {
                 fan_speed_change_requests[CoolingLine::TYPE_IRONING_FAN_START] = false;
             }
             need_set_fan = true;
diff --git a/src/libslic3r/GCode/PressureEqualizer.cpp b/src/libslic3r/GCode/PressureEqualizer.cpp
index 2d15f64340..3db54ca2af 100644
--- a/src/libslic3r/GCode/PressureEqualizer.cpp
+++ b/src/libslic3r/GCode/PressureEqualizer.cpp
@@ -541,10 +541,17 @@ void PressureEqualizer::output_gcode_line(const size_t line_idx)
                 // We don't have enough time to accel to max possible extrusion rate
                 // now we calculate the actual possible value
                 target_max_extrusion_rate = std::sqrt((2 * max_sloped_extrusion * sp * sn + sn * e0_2 + sp * e1_2) / (sp + sn));
+
+                // Worst case: we don't have enough time to do an accl-steady-decel movement at all, fallback to the old fashion
+                // single slope mode
+                if (target_max_extrusion_rate <= line.volumetric_extrusion_rate_start ||
+                    target_max_extrusion_rate <= line.volumetric_extrusion_rate_end) {
+                    goto single_slope_fallback;  // TODO: FIXIT: better way than a goto?
+                }
             }
             assert(target_max_extrusion_rate > line.volumetric_extrusion_rate_start);
             assert(target_max_extrusion_rate > line.volumetric_extrusion_rate_end);
-            assert(target_max_extrusion_rate >= line.volumetric_extrusion_rate);
+            assert(target_max_extrusion_rate <= line.volumetric_extrusion_rate);
 
             // if the extrusion rate change is trivial, then ignore this algorithm and use the single sloped version instead
             delta_volumetric_rate = std::round(std::min({ // important! it's MIN here not max!
@@ -626,7 +633,7 @@ void PressureEqualizer::output_gcode_line(const size_t line_idx)
                 return;
             }
         }
-
+single_slope_fallback:
         bool accelerating = line.volumetric_extrusion_rate_start < line.volumetric_extrusion_rate_end;
         float feed_avg = 0.5f * (line.pos_start[4] + line.pos_end[4]);
         // Limiting volumetric extrusion rate slope for this segment.