diff --git a/gnuradio-3.8.3.0.tar.gz b/gnuradio-3.8.3.0.tar.gz
new file mode 100644
index 0000000..ec8650c
--- /dev/null
+++ b/gnuradio-3.8.3.0.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7135067362625a6e56fa3f57f6cd100effa2d4615f5993aad67eeef208cfb05f
+size 3390327
diff --git a/gnuradio-3.8.3.0.tar.xz b/gnuradio-3.8.3.0.tar.xz
deleted file mode 100644
index 0e9d246..0000000
--- a/gnuradio-3.8.3.0.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:0019dfc4b32d63c1392aa264aed2253c1e0c2fb09216f8e2cc269bbfb8bb49b5
-size 9
diff --git a/gnuradio.changes b/gnuradio.changes
index 1b9f874..fbfeb71 100644
--- a/gnuradio.changes
+++ b/gnuradio.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Apr 12 07:05:36 UTC 2021 - Martin Pluskal <mpluskal@suse.com>
+
+- Fix source url 
+- Use ninja for building
+
 -------------------------------------------------------------------
 Mon Mar 22 23:32:03 UTC 2021 - Wojciech Kazubski <wk@ire.pw.edu.pl>
 
diff --git a/gnuradio.spec b/gnuradio.spec
index f5b4b98..c9f205e 100644
--- a/gnuradio.spec
+++ b/gnuradio.spec
@@ -29,7 +29,7 @@ Summary:        GNU software radio
 License:        GPL-3.0-or-later
 Group:          Productivity/Hamradio/Other
 URL:            https://gnuradio.org
-Source0:        https://github.com/gnuradio/gnuradio/releases/download/v%{version}/gnuradio-%{version}.tar.xz
+Source0:        https://github.com/gnuradio/gnuradio/archive/refs/tags/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 # http://www.nathanwest.us/grc_to_37.sh
 Source4:        grc_to_37.sh
 Source99:       %{name}-rpmlintrc
@@ -53,6 +53,7 @@ BuildRequires:  libgsm-devel
 BuildRequires:  libjack-devel
 BuildRequires:  libmpir-devel
 BuildRequires:  log4cpp-devel
+BuildRequires:  ninja
 BuildRequires:  orc
 BuildRequires:  pkgconfig
 BuildRequires:  portaudio-devel
@@ -162,10 +163,7 @@ performance wireless devices into software problems.
 This package contains some examples of using GNU Radio.
 
 %prep
-%setup -q
-%patch0 -p1
-%patch1 -p1
-%patch2 -p1
+%autosetup -p1
 
 # remove buildtime from documentation
 sed -i 's|^HTML_TIMESTAMP         = YES|HTML_TIMESTAMP         = NO|' docs/doxygen/Doxyfile.in
@@ -175,6 +173,7 @@ sed -i 's|^HTML_TIMESTAMP         = YES|HTML_TIMESTAMP         = NO|' docs/doxyg
 find  gr-utils/python/modtool/templates/gr-newmod -name CMakeLists.txt -exec mv '{}' '{}.tmpl' \;
 
 %build
+%define __builder ninja
 %cmake \
   -DENABLE_GRC=ON \
 %ifarch armv6l armv6hl