diff -aur Xfoil/bin/Makefile_gfortran Xfoil.patched/bin/Makefile_gfortran
--- Xfoil/bin/Makefile_gfortran	2012-03-07 06:33:23.000000000 +0100
+++ Xfoil.patched/bin/Makefile_gfortran	2014-03-23 00:42:38.124566013 +0100
@@ -39,7 +39,7 @@
 #PLTOBJ = -lPlt 
 
 # The extra location arg here is for Linux which places X libs in /usr/X11R6
-PLTLIB = -L/usr/X11R6/lib -lX11
+PLTLIB = -L/usr/lib -lX11
 
 ###================================================
 ###  Default compilers and flags
@@ -49,8 +49,8 @@
 FFLOPT  = -O
 INSTALLCMD = install -s
 
-CC = cc
-CFLAGS = -O -DUNDERSCORE
+CC = gcc
+CFLAGS = -O2 -DUNDERSCORE
 
 ##--------------------------
 
@@ -118,12 +118,12 @@
 FC = gfortran
 CHK = 
 #CHK = -fbounds-check -finit-real=inf -ffpe-trap=invalid,zero,denormal
-DBL = -fdefault-real-8
-FFLAGS = -O $(CHK) $(DBL)
-FFLOPT = -O $(CHK) $(DBL)
+DBL = -fdefault-real-8 -fallow-argument-mismatch
+FFLAGS = -O2 $(CHK) $(DBL)
+FFLOPT = -O2 $(CHK) $(DBL)
 FTNLIB =
 
-PLTOBJ = ../plotlib/libPlt_gDP.a 
+PLTOBJ = ../plotlib/libPlt.a 
 
 
 
@@ -133,23 +133,23 @@
 	$(INSTALLCMD) $(PROGS) $(BINDIR)
 
 clean:
-	-/bin/rm $(PROGS)
-	-/bin/rm $(XFOILOBJ) $(XUTILOBJ) $(OSOBJ) $(PPLOTOBJ) $(PXPLOTOBJ)
+	-/bin/rm -f $(PROGS)
+	-/bin/rm -f $(XFOILOBJ) $(XUTILOBJ) $(OSOBJ) $(PPLOTOBJ) $(PXPLOTOBJ)
 #	-/bin/rm *.o
 
 
 
 xfoil: $(XFOILOBJ) $(XUTILOBJ) $(OSOBJ)
 	$(FC) -o xfoil $(XFOILOBJ) $(XUTILOBJ) $(OSOBJ) $(PLTOBJ) $(PLTLIB) $(FTNLIB)
-	$(INSTALLCMD) xfoil $(BINDIR)
+#	$(INSTALLCMD) xfoil $(BINDIR)
 
 pxplot:	$(PXPLOTOBJ) $(XUTILOBJ)
 	$(FC) -o pxplot $(PXPLOTOBJ) $(XUTILOBJ) $(PLTOBJ) $(PLTLIB) $(FTNLIB)
-	$(INSTALLCMD) pxplot $(BINDIR)
+#	$(INSTALLCMD) pxplot $(BINDIR)
 
 pplot:	$(PPLOTOBJ) $(XUTILOBJ)
 	$(FC) -o pplot $(PPLOTOBJ) $(XUTILOBJ)  $(PLTOBJ) $(PLTLIB) $(FTNLIB)
-	$(INSTALLCMD) pplot $(BINDIR)
+#	$(INSTALLCMD) pplot $(BINDIR)
 
 blu: blu.o profil.o
 	$(FC) -o blu blu.o profil.o
diff -aur Xfoil/orrs/bin/Makefile_DP Xfoil.patched/orrs/bin/Makefile_DP
--- Xfoil/orrs/bin/Makefile_DP	2007-04-05 23:29:35.000000000 +0200
+++ Xfoil.patched/orrs/bin/Makefile_DP	2014-03-23 00:57:11.408901597 +0100
@@ -4,23 +4,26 @@
 
 #========================================
 #  Default compiler flags
-FC = f77
-FLG = -O -r8
+FC = gfortran
+FLG = -O2 -fdefault-real-8
 PLTLIB = -lX11
 FTNLIB =
 
 #========================================
 #  Uncomment for Intel Fortran Compiler
-FC = ifort
-FLG = -O -r8
-PLTLIB = -L/usr/X11R6/lib -lX11
-FTNLIB =
+#FC = ifort
+#FLG = -O -r8
+#PLTLIB = -L/usr/X11R6/lib -lX11
+#FTNLIB =
 
 #========================================
 
 
 OS: osgen osmap.o
 
+clean:
+	/bin/rm -f *.o osgen
+
 
 osgen: osgen.o io.o spline.o getarg0.o
 	$(FC) -o osgen osgen.o io.o spline.o getarg0.o $(FTNLIB)
diff -aur Xfoil/plotlib/config.make.gfortranDP Xfoil.patched/plotlib/config.make.gfortranDP
--- Xfoil/plotlib/config.make.gfortranDP	2013-07-02 17:19:37.000000000 +0200
+++ Xfoil.patched/plotlib/config.make.gfortranDP	2014-03-23 00:34:26.911190434 +0100
@@ -7,7 +7,7 @@
 
 
 # Set library name 
-PLTLIB = libPlt_gDP.a
+PLTLIB = libPlt.a
 
 # Some fortrans need trailing underscores in C interface symbols (see Xwin.c)
 # This should work for most of the "unix" fortran compilers
@@ -17,9 +17,9 @@
 CC  = gcc
 DP = -fdefault-real-8
 
-FFLAGS  = -m64 -O2 $(DP)
-CFLAGS  = -m64 -O2 $(DEFINE) -I/usr/X11/include
+FFLAGS  = -O2 -fno-range-check $(DP)
+CFLAGS  = -O2 $(DEFINE)
 AR = ar r
 RANLIB = ranlib 
-LINKLIB = -L/usr/X11R6/lib -lX11 
+LINKLIB = -L/usr/lib -lX11 
 
diff -aur Xfoil/plotlib/examples/Makefile Xfoil.patched/plotlib/examples/Makefile
--- Xfoil/plotlib/examples/Makefile	2012-12-18 22:39:58.000000000 +0100
+++ Xfoil.patched/plotlib/examples/Makefile	2014-03-23 00:36:10.099992850 +0100
@@ -30,7 +30,7 @@
 ### This line includes your compiler/make options
 ### with definitions for compiler and flags
 
-include ../config.make
+include ../config.make.gfortranDP
 
 ###================================================
 
@@ -52,9 +52,9 @@
 test:  $(PROGS)
 
 clean:
-	-/bin/rm *.o
-	-/bin/rm $(PROGS)
-	-/bin/rm plot*.ps
+	-/bin/rm -f *.o
+	-/bin/rm -f $(PROGS)
+	-/bin/rm -f plot*.ps
 
 
 
diff -aur Xfoil/plotlib/Makefile Xfoil.patched/plotlib/Makefile
--- Xfoil/plotlib/Makefile	2012-12-17 05:10:15.000000000 +0100
+++ Xfoil.patched/plotlib/Makefile	2014-03-23 00:34:45.561576536 +0100
@@ -68,7 +68,7 @@
 
 ###-------------------------------------------------------------------------
 ### Set compiler, compiler flags, name of output object library
-include ./config.make
+include ./config.make.gfortranDP
 
 
 ###-------------------------------------------------------------------------
@@ -90,9 +90,9 @@
 	$(RANLIB)   $(INSTALLDIR)/$(PLTLIB)
 
 clean:
-	-/bin/rm $(OBJ) $(OBJOLD) $(OBJ3D) $(OBJMISC)
-	-/bin/rm $(PLTLIB)
-	-/bin/rm plot*.ps
+	-/bin/rm -f $(OBJ) $(OBJOLD) $(OBJ3D) $(OBJMISC)
+	-/bin/rm -f $(PLTLIB)
+	-/bin/rm -f plot*.ps
 	(cd examples; make clean)