diff -ru3 source-old/src/core/datapaths.cpp source-new/src/core/datapaths.cpp
--- source-old/src/core/datapaths.cpp	1970-01-01 03:00:01.000000000 +0300
+++ source-new/src/core/datapaths.cpp	2018-03-04 00:10:25.247262567 +0300
@@ -335,7 +335,7 @@
 	paths.append(workingDirectory());
 	paths.append("./");
 #ifndef Q_OS_WIN32
-	paths.append(INSTALL_PREFIX "/" INSTALL_LIBDIR "/doomseeker/");
+	paths.append(INSTALL_PREFIX "/lib/doomseeker/");
 #endif
 	paths = uniquePaths(paths);
 	return Strings::combineManyPaths(paths, "engines/");
diff -ru3 source-old/src/core/pathfinder/pathfinder.cpp source-new/src/core/pathfinder/pathfinder.cpp
--- source-old/src/core/pathfinder/pathfinder.cpp	1970-01-01 03:00:01.000000000 +0300
+++ source-new/src/core/pathfinder/pathfinder.cpp	2018-03-04 00:09:34.862556976 +0300
@@ -128,9 +128,7 @@
 		<< DataPaths::programFilesDirectory(DataPaths::x64)
 		<< DataPaths::programFilesDirectory(DataPaths::x86);
 #else
-	paths << "/usr/bin" << "/usr/local/bin" << "/usr/share/bin"
-		<< "/usr/games/" << "/usr/local/games/"
-		<< "/usr/share/games/" << gDefaultDataPaths->workingDirectory() << ".";
+	paths << gDefaultDataPaths->workingDirectory() << ".";
 #endif
 	QStringList pathsCopy(paths);
 	foreach (const QString &path, pathsCopy)
diff -ru3 source-old/src/core/pathfinder/wadpathfinder.cpp source-new/src/core/pathfinder/wadpathfinder.cpp
--- source-old/src/core/pathfinder/wadpathfinder.cpp	1970-01-01 03:00:01.000000000 +0300
+++ source-new/src/core/pathfinder/wadpathfinder.cpp	2018-03-04 00:09:56.822865339 +0300
@@ -84,10 +84,6 @@
 		QStringList defaultPaths()
 		{
 			QStringList paths;
-			#ifdef Q_OS_UNIX
-			paths << "/usr/local/share/games/doom/"
-				<< "/usr/share/games/doom/";
-			#endif
 			return paths;
 		}
 };