Linux port

Pdf4QtViewer/Pdf4QtViewer.qbs

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+Pdf4QtLibrary {
+    name: "Pdf4QtViewer"
+    files: [
+        "*.h",
+        "*.cpp",
+        "*.ui",
+        "pdf4qtviewer.qrc",
+    ]
+    cpp.includePaths: ["."]
+    cpp.defines: ['QT_INSTALL_DIRECTORY=""']
+    Depends { name: "Qt"; submodules: ["printsupport", "texttospeech", "network", "xml"] }
+    Depends { name: "Pdf4QtLib" }
+    Export {
+        Depends { name: "cpp" }
+        cpp.includePaths: ["."]
+        Depends { name: "Pdf4QtLib" }
+    }
+}