Support Haiku OS specific libs and compile flags in the build system.

config.pri

@@ -10,39 +10,39 @@ QT_VER_MIN = $$member(QT_VERSION, 1)
 
 lessThan(QT_VER_MAJ, 5) {
 error(YACReader requires Qt 5 or newer but Qt $$[QT_VERSION] was detected.)
-	}
+  }
 lessThan(QT_VER_MIN, 4):!CONFIG(no_opengl)	{
-	CONFIG += legacy_gl_widget
-	message ("Qt < 5.4 detected. Using QGLWidget for coverflow.")
-	}
+  CONFIG += legacy_gl_widget
+  message ("Qt < 5.4 detected. Using QGLWidget for coverflow.")
+  }
 lessThan(QT_VER_MIN, 3){
-	error ("You need at least Qt 5.3 to build YACReader or YACReaderLibrary")
-	}
-	
+  error ("You need at least Qt 5.3 to build YACReader or YACReaderLibrary")
+  }
+
 #build without opengl widget support
 CONFIG(no_opengl) {
-	DEFINES += NO_OPENGL
+  DEFINES += NO_OPENGL
 }
 
 #default values for decompression backends
 !CONFIG(unarr):!CONFIG(7zip) {
-	unix {
-		CONFIG += unarr
-		}
-	win32 {
-                CONFIG += unarr
-		}
+  unix {
+    CONFIG += unarr
+  }
+  win32 {
+    CONFIG += unarr
+  }
 }
 
 #default values for pdf render backend
 win32:!CONFIG(poppler):!CONFIG(pdfium) {
-        CONFIG += pdfium
+  CONFIG += pdfium
 }
 
 unix:!macx:!CONFIG(poppler):!CONFIG(pdfium) {
-	CONFIG += poppler
+  CONFIG += poppler
 }
 
 macx:!CONFIG(pdfkit):!CONFIG(pdfium) {
-	CONFIG += pdfium
+  CONFIG += pdfium
 }