diff -Nur pari-2.5.1.orig/config/get_config_options pari-2.5.1/config/get_config_options
--- pari-2.5.1.orig/config/get_config_options	2012-08-01 18:32:03.000000000 +0100
+++ pari-2.5.1/config/get_config_options	2012-08-01 20:57:09.000000000 +0100
@@ -83,10 +83,12 @@
   --with-ncurses-lib=*|--with-ncurses=*)
       with_ncurses_lib=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
 
+  --without-qt|--with-qt=no) without_qt=yes ;;
   --with-qt) with_qt=yes ;;
   --with-qt=*)
       with_qt=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
 
+  --without-fltk|--with-fltk=no) without_fltk=yes ;;
   --with-fltk) with_fltk=yes ;;
   --with-fltk=*)
       with_fltk=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
@@ -158,7 +160,9 @@
   --with-gmp-lib=DIR          specify location of gmp libs
 
   --with-qt[=DIR]        use the Qt graphical library [prefix for Qt dir.]
+  --without-qt           do not try to use the Qt lib
   --with-fltk[=DIR]      use the FLTK graphical library [prefix for FLTK dir.]
+  --without-fltk         do not try to use the FLTK lib
 
 EOT
 exit 1
diff -Nur pari-2.5.1.orig/config/get_fltk pari-2.5.1/config/get_fltk
--- pari-2.5.1.orig/config/get_fltk	2012-08-01 18:32:03.000000000 +0100
+++ pari-2.5.1/config/get_fltk	2012-08-01 22:28:23.000000000 +0100
@@ -2,6 +2,9 @@
   with_fltk=yes
 fi
 FLTKDIR=
+if test -z "$without_fltk; then
+   FLTKDIR="`fltk-config --prefix 2>/dev/null`"
+fi
 case "$with_fltk" in
 yes)
    pth=$libpth; lib=fltk; . ./locatelib
diff -Nur pari-2.5.1.orig/config/get_graphic_lib pari-2.5.1/config/get_graphic_lib
--- pari-2.5.1.orig/config/get_graphic_lib	2012-08-01 18:32:03.000000000 +0100
+++ pari-2.5.1/config/get_graphic_lib	2012-08-01 22:16:57.000000000 +0100
@@ -11,6 +11,7 @@
 else
   if test -n "$with_fltk"; then which_graphic_lib=fltk; fi
   if test -n "$with_qt";   then which_graphic_lib=Qt; fi
+  if test -n "$without_fltk" -a -n "$without_qt"; then which_graphic_lib=none; fi
   if test "$which_graphic_lib" != none; then
     case $osname in
       mingw) case $which_graphic_lib in
@@ -41,7 +42,7 @@
 case $which_graphic_lib in
   auto|fltk)
     . ./get_fltk # FLTKDIR, FLTK_LIBS
-    if test -z "$FLTKDIR"; then
+    if test -z "`fltk-config --ldflags 2> /dev/null`"; then
       case $which_graphic_lib in fltk) which_graphic_lib=none;; esac
     else
       which_graphic_lib=fltk
diff -Nur pari-2.5.1.orig/config/get_Qt pari-2.5.1/config/get_Qt
--- pari-2.5.1.orig/config/get_Qt	2012-08-01 18:32:03.000000000 +0100
+++ pari-2.5.1/config/get_Qt	2012-08-01 20:39:28.000000000 +0100
@@ -5,7 +5,7 @@
 case "$with_qt" in
 yes)
    pth="/usr/local/lib /usr/local/share /usr/lib /usr/share"
-   QTDIR=`locatedir qt4/bin $pth`
+   QTDIR=`locatedir qt4 $pth`
    QTLIB="-lQtCore -lQtGui"
    which_graphic_lib=Qt4
    if test -z "$QTDIR"; then
diff -Nur pari-2.5.1.orig/config/Makefile.SH pari-2.5.1/config/Makefile.SH
--- pari-2.5.1.orig/config/Makefile.SH	2012-08-01 18:32:03.000000000 +0100
+++ pari-2.5.1/config/Makefile.SH	2012-08-01 21:08:20.000000000 +0100
@@ -65,12 +65,12 @@
   PLOTLIBS="-L\$(QTDIR)/lib $QTLIB"
   graph=plotQt;;
 Qt4)
-  PLOTCFLAGS='-D__FANCY_WIN__ -I$(QTDIR)/include'
-  PLOTLIBS="-L\$(QTDIR)/lib $QTLIB"
+  PLOTCFLAGS='-D__FANCY_WIN__ `pkg-config --cflags QtGui`'
+  PLOTLIBS="`pkg-config --libs QtGui`"
   graph=plotQt4;;
 fltk)
-  PLOTCFLAGS="-I\$(FLTKDIR)/include $X11_INC"
-  PLOTLIBS="-L\$(FLTKDIR)/lib -lfltk $FLTK_LIBS"
+  PLOTCFLAGS="`fltk-config --cxxflags` $X11_INC"
+  PLOTLIBS="`fltk-config --ldflags`"
   postconfig='-fltk-config --post '
   graph=plotfltk;;
 win32)
@@ -254,7 +254,7 @@
 GMPINCLUDE = $GMPINCLUDE
 # Graphic library.
 QTDIR      = "$QTDIR"
-MOC        = \$(QTDIR)/bin/moc
+MOC        = "`which moc`"
 PLOTCFLAGS = $PLOTCFLAGS
 PLOTLIBS   = $PLOTLIBS
 CPLUSPLUS  = g++