diff --git a/proxyface.spec.in b/proxyface.spec.in
index 14a2645..c49a1c4 100644
--- a/proxyface.spec.in
+++ b/proxyface.spec.in
@@ -22,10 +22,12 @@ This package contains only the shared libraries required at runtime.
 
 %prep
 %setup -q
-CPPFLAGS="-std=c++0x -I/usr/include/PCSC -I/usr/include/p11-kit-1/p11-kit" \
-  ./configure --prefix=/usr \
-              --docdir=/usr/share/doc/packages/@PACKAGENAME@ \
-              --libdir=/usr/%_lib
+MOC="/usr/bin/moc" UIC="/usr/bin/uic" RCC="/usr/bin/rcc" \
+    LUPDATE="/usr/bin/lupdate" LRELEASE="/usr/bin/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@ \
+                --libdir=/usr/%_lib
 
 %build
 make