diff --git a/proxyface.spec.in b/proxyface.spec.in
index c49a1c4..aef125b 100644
--- a/proxyface.spec.in
+++ b/proxyface.spec.in
@@ -22,8 +22,11 @@ This package contains only the shared libraries required at runtime.
 
 %prep
 %setup -q
-MOC="/usr/bin/moc" UIC="/usr/bin/uic" RCC="/usr/bin/rcc" \
-    LUPDATE="/usr/bin/lupdate" LRELEASE="/usr/bin/lrelease" \
+function checkqt() {
+    which /usr/bin/$1 || /usr/bin/$1-qt5 || /usr/bin/$1-qt4
+}
+MOC="$(checkqt moc)" UIC="$(checkqt uic)" RCC="$(checkqt rcc)" \
+    LUPDATE="$(checkqt lupdate)" LRELEASE="$(checkqt lrelease)" \
     CPPFLAGS="-std=c++0x -I/usr/include/PCSC -I/usr/include/pkcs11-helper-1.0" \
     ./configure --prefix=/usr \
                 --docdir=/usr/share/doc/packages/@PACKAGENAME@ \