Init QtKeychain support.

spectral.pro

@@ -20,6 +20,9 @@ isEmpty(USE_SYSTEM_SORTFILTERPROXYMODEL) {
 isEmpty(USE_SYSTEM_QMATRIXCLIENT) {
     USE_SYSTEM_QMATRIXCLIENT = false
 }
+isEmpty(USE_SYSTEM_QTCHAIN) {
+    USE_SYSTEM_QTCHAIN = false
+}
 
 $$USE_SYSTEM_QMATRIXCLIENT {
     PKGCONFIG += QMatrixClient
@@ -33,6 +36,12 @@ $$USE_SYSTEM_SORTFILTERPROXYMODEL {
     message("Falling back to built-in SortFilterProxyModel.")
     include(include/SortFilterProxyModel/SortFilterProxyModel.pri)
 }
+$$USE_SYSTEM_QTCHAIN {
+    LIBS += -lqt5keychain
+} else {
+    message("Falling back to built-in QtKeychain.")
+    include(include/qtkeychain/qt5keychain.pri)
+}
 
 INCLUDEPATH += include/hoedown
 HEADERS += \