diff --git a/defaults.json.in b/defaults.json.in
new file mode 100644
index 0000000..709d182
--- /dev/null
+++ b/defaults.json.in
@@ -0,0 +1,7 @@
+{
+  "libdir": "%{_libdir}",
+  "cflags": "%{build_cflags}",
+  "cxxflags": "%{build_cxxflags}",
+  "cppflags": "",
+  "ldflags": "-L/app/lib %{build_ldflags}"
+}
diff --git a/flatpak-runtime-config.spec b/flatpak-runtime-config.spec
index a795c8a..0ae25ad 100644
--- a/flatpak-runtime-config.spec
+++ b/flatpak-runtime-config.spec
@@ -1,11 +1,12 @@
 Name:           flatpak-runtime-config
 Version:        33
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Configuration files that live inside the flatpak runtime
 Source1:        50-flatpak.conf
 Source2:        usercustomize.py
 Source3:        org.fedoraproject.Platform.appdata.xml
 Source4:        org.fedoraproject.Sdk.appdata.xml
+Source5:        defaults.json.in
 
 License:        MIT
 
@@ -41,6 +42,14 @@ mkdir -p $RPM_BUILD_ROOT%{_datadir}/metainfo
 install -t $RPM_BUILD_ROOT%{_datadir}/metainfo -p -m 0644 %{SOURCE3}
 install -t $RPM_BUILD_ROOT%{_datadir}/metainfo -p -m 0644 %{SOURCE4}
 
+# Install flatpak-builder config file
+mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/flatpak-builder
+sed -e 's|%%{_libdir}|%{_libdir}|' \
+    -e 's|%%{build_cflags}|%{build_cflags}|' \
+    -e 's|%%{build_cxxflags}|%{build_cxxflags}|' \
+    -e 's|%%{build_ldflags}|%{build_ldflags}|' \
+    %{SOURCE5} > $RPM_BUILD_ROOT%{_sysconfdir}/flatpak-builder/defaults.json
+
 mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/ld.so.conf.d/
 echo "/app/%{_lib}" > $RPM_BUILD_ROOT%{_sysconfdir}/ld.so.conf.d/app.conf
 
@@ -71,10 +80,14 @@ HOME=/root /usr/bin/fc-cache -s
 %dir %{_prefix}/cache/fontconfig
 %{python3_sitelib}
 %{_datadir}/metainfo/*.appdata.xml
+%{_sysconfdir}/flatpak-builder/
 %{_sysconfdir}/fonts/conf.d/*
 %{_sysconfdir}/ld.so.conf.d/app.conf
 
 %changelog
+* Tue Feb 02 2021 Kalev Lember <klember@redhat.com> - 33-2
+- Install flatpak-builder defaults.json config file
+
 * Wed Jul 29 2020 Kalev Lember <klember@redhat.com> - 33-1
 - Install appdata for both the Platform and the Sdk