diff --git a/_constraints b/_constraints
index 891c663..293f62f 100644
--- a/_constraints
+++ b/_constraints
@@ -4,7 +4,7 @@
    <size unit="G">4</size>
   </memory>
   <disk>
-   <size unit="G">28</size>
+   <size unit="G">10</size>
   </disk>
   </hardware>
 </constraints>
diff --git a/krita.changes b/krita.changes
index 82750ce..33175f6 100644
--- a/krita.changes
+++ b/krita.changes
@@ -1,3 +1,16 @@
+-------------------------------------------------------------------
+Mon Nov 28 09:27:13 UTC 2022 - Christophe Giboudeaux <christophe@krop.fr>
+
+- Disable PCH to drastically reduce the required disk space
+  needed to build krita
+- Update _constraints
+- Spec cleanup
+
+-------------------------------------------------------------------
+Tue Nov 22 12:51:18 UTC 2022 - Christophe Giboudeaux <christophe@krop.fr>
+
+- Require the optional xsimd dependency
+
 -------------------------------------------------------------------
 Wed Nov  9 09:50:24 UTC 2022 - Christophe Giboudeaux <christophe@krop.fr>
 
diff --git a/krita.spec b/krita.spec
index 1c70f75..dfa3c42 100644
--- a/krita.spec
+++ b/krita.spec
@@ -17,12 +17,17 @@
 
 
 %bcond_without released
+# Build fails on x86 and powerpc with xsimd (kde#462122)
+%ifnarch %ix86 ppc64 ppc64le
+%if 0%{?suse_version} > 1500 || (0%{?is_opensuse} && 0%{?sle_version} > 150400)
+%bcond_without xsimd
+%endif
+%endif
 Name:           krita
 Version:        5.1.3
 Release:        0
 Summary:        Digital Painting Application
 License:        BSD-2-Clause AND GPL-2.0-or-later AND LGPL-2.0-or-later AND LGPL-2.1-or-later AND GPL-3.0-or-later AND CC0-1.0 AND LGPL-2.0-only
-Group:          Productivity/Graphics/Bitmap Editors
 URL:            https://www.krita.org/
 Source0:        https://download.kde.org/stable/krita/%{version}/krita-%{version}.tar.xz
 %if %{with released}
@@ -86,6 +91,9 @@ BuildRequires:  cmake(Qt5Widgets)
 BuildRequires:  cmake(Qt5X11Extras)
 BuildRequires:  cmake(Qt5Xml)
 BuildRequires:  cmake(QuaZip-Qt5)
+%if %{with xsimd}
+BuildRequires:  cmake(xsimd)
+%endif
 BuildRequires:  pkgconfig(OpenColorIO)
 # not in 15.5 yet
 %if 0%{?suse_version} > 1500
@@ -106,7 +114,6 @@ matte painters, as well as illustrations and comics.
 
 %package devel
 Summary:        Krita Build Environment
-Group:          Development/Libraries/KDE
 Requires:       %{name} = %{version}
 Requires:       cmake(Qt5Core)
 
@@ -119,17 +126,16 @@ Development headers and libraries for Krita.
 %autosetup -p1
 
 %build
-# install translations to %%{_kf5_localedir} so they don't clash with the krita translations in calligra-l10n (KDE4 based)
-# can probably be changed back to the standard location when calligra is KF5 based...
-%cmake_kf5 -d build -- -DCMAKE_INSTALL_LOCALEDIR=%{_kf5_localedir}
-%make_jobs
+%cmake_kf5 -d build -- -DKRITA_ENABLE_PCH:BOOL=OFF
+
+%cmake_build
 
 %install
 %kf5_makeinstall -C build
-%suse_update_desktop_file -r org.kde.krita      Qt KDE Graphics RasterGraphics
-%if %{with released}
-%kf5_find_lang %{name}
-%endif
+
+%suse_update_desktop_file -r org.kde.krita Qt KDE Graphics RasterGraphics
+
+%find_lang %{name}
 
 chmod -x %{buildroot}%{_kf5_applicationsdir}/*.desktop
 
@@ -174,8 +180,6 @@ sed -i "/#!\/usr\/bin\/env/d" %{buildroot}%{_kf5_libdir}/krita-python-libs/krita
 %{_includedir}/kis_qmic_plugin_interface.h
 %{_includedir}/kritaqmicinterface_export.h
 
-%if %{with released}
 %files lang -f %{name}.lang
-%endif
 
 %changelog