Support using dynamic library of qqmlsortfilterproxymodel.

spectral.pro

@@ -12,9 +12,16 @@ packagesExist(QMatrixClient) {
     message("Found libQMatrixClient via pkg-config.")
     PKGCONFIG += QMatrixClient
 } else {
+    messge("Build libQMatrixClient from source.")
     include(include/libqmatrixclient/libqmatrixclient.pri)
 }
-include(include/SortFilterProxyModel/SortFilterProxyModel.pri)
+packagesExist(SortFilterProxyModel) {
+    message("Found qqmlsortfilterproxymodel via pkg-config.")
+    PKGCONFIG += SortFilterProxyModel
+} else {
+    messge("Build qqmlsortfilterproxymodel from source.")
+    include(include/SortFilterProxyModel/SortFilterProxyModel.pri)
+}
 
 # The following define makes your compiler emit warnings if you use
 # any feature of Qt which as been marked deprecated (the exact warnings