--- xflr5-gui/xflr5-gui.pro	2019-12-26 23:06:50.168628145 -0500
+++ xflr5-gui/xflr5-gui.pro.new	2019-12-26 23:07:01.925796901 -0500
@@ -128,8 +128,8 @@
 QMAKE_CFLAGS_WARN_ON -= -W3
 QMAKE_CFLAGS_WARN_ON += -W4
 
-LIBS += -L../xflr5-engine -lxflr5-engine
-LIBS += -L../XFoil-lib -lXFoil
+LIBS += ../xflr5-engine/libxflr5-engine.so
+LIBS += ../XFoil-lib/libXFoil.so
 
 include(xflr5v6.pri)