diff --git a/kf5-kunitconversion.spec b/kf5-kunitconversion.spec
old mode 100755
new mode 100644
index fed06c8..3578f9e
--- a/kf5-kunitconversion.spec
+++ b/kf5-kunitconversion.spec
@@ -1,3 +1,4 @@
+%undefine __cmake_in_source_build
 %global framework kunitconversion
 
 Name:           kf5-%{framework}
@@ -39,16 +40,12 @@ developing applications that use %{name}.
 
 
 %build
-mkdir %{_target_platform}
-pushd %{_target_platform}
-%{cmake_kf5} ..
-popd
-
-%make_build -C %{_target_platform}
+%{cmake_kf5}
+%cmake_build
 
 
 %install
-make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
+%cmake_install
 
 %find_lang %{name} --all-name --with-man