diff --git a/openvas-scanner.spec b/openvas-scanner.spec
index c63486c..8a68eba 100644
--- a/openvas-scanner.spec
+++ b/openvas-scanner.spec
@@ -116,9 +116,9 @@ done
 
 %build
 #configure --disable-static
-export CFLAGS=-Werror=unused-but-set-variable
+export CFLAGS="$RPM_OPT_FLAGS -Werror=unused-but-set-variable"
 %cmake -DLOCALSTATEDIR:PATH=%{_var} -DOPENVASSD_RULES:PATH=%{_sysconfdir}/openvas/openvassd.rules
-make %{?_smp_mflags}
+make %{?_smp_mflags} VERBOSE=1
 
 %install
 make install DESTDIR=%{buildroot} INSTALL="install -p"