Use RPM macros

slop.spec.in

@@ -44,7 +44,7 @@ cmake -DCMAKE_INSTALL_PREFIX="/usr" ./
 %make_install
 
 %files
-/usr/bin/slop
+%{_bindir}/slop
 /usr/include/slop.hpp
-/usr/lib/libslopy.so
-/usr/share/man/man1/slop.1.gz
+%{_libdir}/libslopy.so
+%{_mandir}/man1/slop.1.gz